Paralbunea chani, Boyko, 2020

Boyko, Christopher B., 2020, Fig. 4 in Striatoandricus sanchezi Cuesta-Porta & Melika & Nicholls & Stone & Pujade-Villar 2022, n. sp., Zoological Studies 59 (15), pp. 1-16 : 4-13

Genus Paralbunea Serène, 1977

Paralbunea chani n. sp. ( Fig. 2 ) urn:lsid:zoobank.org:act:37B2A82A-D609-4A9E-9A47-4D14F6F72F5D

Type material: holotype intersex specimen (13.6 mm CL × 17.5 mm CW), Dasi fishing port, Yilan County, Taiwan, coll. C. W. Huang (ex commercial trawler), 19 July 2011 ( NTOU A01450).

Description: Carapace ( Fig. 2A ) wider than long. Anterior margin concave on either side of ocular sinus, becoming convex laterally, one (left) or three (right) small spines on convex region, ventral row of long plumose setae submarginally. Rostrum present, reaching posterior margin of ocular plate. Ocular sinus smoothly concave, unarmed. Frontal region smooth; setal field broad posteriorly, narrowing anteriorly, with narrow lateral elements and strongly concave anterior margin. CG 1 parallel to anterior margin of carapace, sinuous, slightly crenulate, medial and curved lateral elements slightly separate. Mesogastric region smooth, CG 2 absent; CG 3 present as two short oblique lateral elements; CG 4 as two short oblique medial elements and two longer lateral elements contiguous with CG 6. Hepatic region smooth, with long setose groove at median of lateral margin. Epibranchial region roughly triangular, smooth. Metagastric region smooth; CG 5 absent; CG 6 slightly crenulate laterally, entire, contiguous at apices with CG 4 lateral elements; CG 7 as two lateral elements separate from CG 6. Cardiac region smooth; CG 8 present as two minute, widely separated elements; CG 9 present as four short elements; CG 10 present as three short elements; CG 11 absent. Branchial region with few lateral short rows of setae and posterior small setose punctae. Posterior margin deeply and evenly convex, submarginal groove not reaching to margin of posterior concavity. Branchiostegite with strong anterolateral submarginal spine, anterior region with scattered short, transverse lines ventral to linea anomurica, ventral region with many short rows of setae and covered with long plumose setae, posterior region membranous, with numerous irregular fragments and covered with long plumose setae.

Ocular plate ( Fig. 2B ) subquadrate, with broad median indentation. Median peduncular segments ovate. Distal peduncular segments as laterally inflated triangles, with strongly convex lateral margins and weakly convex mesial margins, cornea at distal tip indentation (pigment visible as distal spots in preserved specimen), mesial margins separated along length, lateral and distomesial margins with long simple setae, ventral surface with proximal transverse submarginal ridge lined with long plumose setae.

Antennule segment III narrow proximally, expanding distally to two times proximal width, plumose setae on dorsal and ventral margins;dorsal exopodal flagellum with ca. 140 articles (n = 1), long plumose setae on dorsal and ventral margins; ventral endopodal flagellum with three articles (n = 1), plumose setae on dorsal and ventral margins. Segment II slightly medially inflated in dorsal view, plumose setae on dorsal quarter and ventral margin, and scattered on ventral third of surface. Segment I wider than long, unarmed, lateral surface with long plumose setae on dorsal quarter and on dorsal and ventral margins.

Antenna with segment V approximately two times longer than wide, long plumose setae on dorsal margin and few short setae on mediolateral surface, flagellum with seven articles (n = 2), long plumose setae on dorsal, ventral, and distal margins. Segment IV expanded distally, long plumose setae on dorsal and ventral margins, short simple setae on lateral surface. Segment III with long plumose setae on ventral margin, short simple setae on dorsal margin. Segment II short, widening distally, long plumose setae on margins and short plumose setae on lateral surface, antennal acicle long, thin, reaching distal margin of segment IV, long plumose setae on dorsal margin. Segment I rounded proximally, flattened ventromesially, long plumose setae on margins and dorsolateral surface; without dorsolateral lobe.

Mandible incisor process with two teeth, cutting edge with two teeth. Palp three-segmented, with plumose setae on margins and long, thick, simple setae arising from bend in second segment.

Maxillule distal endite proximally narrow, widening to inflated distal end, with thick simple setae on distal margin and thin plumose setae on dorsal margin. Proximal endite with thick simple setae on distal margin.

Maxilla exopod evenly rounded, with plumose setae along distal margin. Scaphognathite rounded on posterior lobe, with plumose setae.

Maxilliped I epipod with short plumose setae on margins and covering lateral surface. Endite tapered distally and subequal to first segment of exopod. Exopod with two segments; proximal segment narrow, margins parallel, with plumose setae; distal segment spatulate, approximately 1.3 times longer than wide, broadest medially, margins and lateral surface with long plumose setae. Endopod flattened and elongate, reaching to distal end of proximal exopodal segment, with plumose setae on surface, thick simple setae on mesial margin.

Maxilliped II dactylus evenly rounded, length equal to width, with thick simple setae distally and thin simple setae on distolateral surface. Propodus two times wider than long, with plumose setae on dorsal margin and long simple setae on distal margin. Carpus not strongly produced dorsodistally, approximately two times longer than wide, with long simple setae on dorsal and distal margins and in small patch on lateral surface. Merus approximately three times longer than wide, margins parallel, with long plumose setae on dorsal margin and scattered on surface, simple setae on ventral margin. Basis-ischium incompletely fused, with plumose setae on margins. Exopod one-half longer than merus, flagellum with one elongate article.

Maxilliped III ( Fig. 2C ) dactylus rounded at tip, long plumose setae on margins and lateral surface. Propodus with longitudinal median row of long plumose setae on lateral surface, dorsal margin with long plumose setae, ventral margin with few short simple setae. Carpus weakly produced onto propodus and reaching one-third length of propodus, lateral surface with rows of long plumose setae medially and ventrally; tuft of long plumose setae distoventrally; long plumose setae on dorsal margin. Merus unarmed, distally slightly inflated, long plumose setae on margins, longitudinal row and six tufts of short plumose setae on lateral surface. Basis incompletely fused with ischium; crista dentata absent. Exopod two-segmented, proximal segment small, distal segment styliform, tapering, approximately three-quarters length of merus, plumose setae on margins; flagellum absent.

Pereopod I ( Fig. 2D ) dactylus curved and tapering, lateral and mesial surfaces smooth, dorsal margin with long plumose and short simple setae, ventral margin smooth. Propodus lateral surface with numerous short, transverse rows of setose rugae; dorsal margin unarmed; ventral margin distally produced into acute spine; cutting edge lacking teeth, lined with long plumose setae; dorsal and ventral margins with long plumose setae; patch of short plumose setae on lateral surface subdorsally. Carpus with dorsodistal angle smoothly rounded; dorsal and distal margins with long plumose setae; short oblique setose ridge in median of lateral surface; tuft of long plumose setae on ventral margin; mesial surface smooth. Merus unarmed; lateral surface without dorsomedial decalcified region, scattered transverse rows of short plumose setae on ventral half, dorsomedial margin with long plumose setae. Basis-ischium incompletely fused, unarmed. Coxa unarmed.

Pereopod II ( Fig. 2E ) dactylus smooth; base to heel nearly straight, heel with smoothly rounded low spur, heel to tip broadly indented, tip subacute, tip to base broadly convex; lateral surface smooth, several widely spaced submarginal tufts of short setae dorsodistally; mesial surface smooth, ventral margin with long plumose setae, dorsal margin with row of long plumose setae from junction with propodus to median of heel. Propodal dorsal surface smooth, ventral margin proximally inflated and rounded; oblique row of long plumose setae on distal margin of lateral surface; distal and ventral margins with long plumose setae; dorsolateral surface as narrow, oblique, flattened shelf, short setae on dorsal margin and long plumose setae on ventral margin; mesial surface with elevated, curved, setose ridge from ventral junction with dactylus almost to ventral proximal junction with carpus. Carpus produced one-fourth over propodus, gently rounded dorsally, with rounded distoventral angle; lateral surface nearly smooth, with irregular, interrupted row of short rugae medially and submarginal elevated ridge ventrally, rugae and ridge with long plumose setae, margins with long plumose setae; mesial surface smooth, interrupted submarginal rows of long plumose setae dorsally, ventrally, and distally. Merus with medial decalcified area on lateral surface, long plumose setae on dorsodistal and ventromedial margins; mesial surface nearly smooth, with many short rows of long plumose setae. Basis-ischium incompletely fused and unarmed. Coxa unarmed.

Pereopod III ( Fig. 2F ) dactylus base to heel slightly concave, heel rounded and weakly produced, heel to indent slightly concave, indent broadly concave, tip subacute, tip to base smoothly convex; distal portion of dactylus broader than area of maximal indent; lateral surface smooth, dorsodistal margin with tufts of short setae, ventral margin with long plumose setae, dorsal margin with short simple and plumose setae; mesial surface smooth, row of plumose setae from junction with propodus to around heel. Propodus weakly inflated; lateral surface smooth, long plumose setae distally, simple setae on margins, long plumose setae on ventral margin; dorsolateral surface narrow, oblique, flattened, with short plumose setae on margins; mesial surface with few scattered long setae. Carpus inflated, produced dorsodistally, reaching one-third across propodus, broadly rounded, dorsolateral margin unarmed; lateral surface slightly rugose dorsodistally, with mat of short simple setae covering distal three-quarters of surface; with two long rows of setae medially; mesial surface smooth, distal and oblique rows of long plumose setae. Merus smooth, dorsal and ventral margins unarmed, dorsodistal and ventromesial margins with long plumose setae; lateral surface with large medially decalcified area and few long plumose setae; mesial surface smooth, with few scattered setae. Basis-ischium incompletely fused and unarmed. Coxa unarmed. Large gonopore on median mesial surface of coxa, surrounded with short plumose setae.

Pereopod IV ( Fig. 2G ) dactylus with base to heel slightly convex, heel low, heel to tip convex to straight, tip acute, tip to base broadly convex; lateral surface smooth, ventral margin with long plumose setae, dorsal margin with short simple setae; mesial surface with median decalcified area, demarcated ventrally by longitudinal elevated ridge with row of long plumose setae, setose punctae ventral to decalcified window. Propodus expanded ventrally, ventral expansion reaching ventral margin of dactylus, margins with long plumose setae, dorsal expansion with row of long plumose setae dorsally and mat of short setae ventrally; lateral and mesial surfaces smooth. Carpus not produced dorsodistally, small mat of setae along distal half of dorsal margin; lateral and mesial surfaces smooth, without medial decalcified area, dorsal margin with short simple and long plumose setae, ventral margin with short plumose setae. Merus lateral surface with few scattered short transverse rows of setae, dorsal and ventral margins with long plumose setae; proximal fourth of mesial surface with large decalcified window. Basis-ischium incompletely fused and unarmed. Coxa unarmed.

Pereopod V with well-developed gonopores.

Abdomen ( Fig. 1A, H ) with somite I wider than long, widest medially; dorsal surface with anterior margin convave, posterior margin slightly concave, with submarginal elevated and curved row of short setae, few scattered setose punctae proximolaterally, small transverse decalcified submedial windows present. Somite II dorsal surface with submarginal transverse ridge anteriorly, patch of setae at posterolateral angle extending onto pleura posteromesially; pleura expanded and directed laterally, anterolateral margin slightly concave, posterolateral margin rounded, anterior and lateral margins with long plumose setae, posterior margin with short setae. Somite III similar to somite II, but narrower and shorter, small patch of short thick setae on posterolateral angle; pleura thinner and shorter than that of somite II, directed anterolaterally, with setae as in somite II, anterolateral angle acute, dorsal surface obliquely flattened anterolaterally, with submarginal row of short simple setae. Somite IV similar that of somite III, but thinner and shorter; pleura thinner and shorter than on somite III, directed slightly anterolaterally, dorsal surface obliquely flattened anterolaterally, with submarginal row of short simple setae, margins with long plumose setae. Somite V narrower but longer than somite IV, lateral margins with plumose setae; pleura absent. Somite VI wider and longer than somite V, dorsal surface with two short oblique rows of setae laterad of midline anteriorly, posterior margins with few long plumose setae; pleura absent.

Stubs of pleopods on somites II– V; large uniramous, paired pleopods lacking.

Telson ( Fig. 1H ) spatulate, rounded distally, proximal half well calcified, distal half weakly calcified, margins with long plumose setae; median longitudinal groove long, extending three-fourths of surface and with short simple setae along distal two-thirds of groove; few short simple setae at proximolateral corners.

Range: Known only from Taiwanese waters (precise location and depth range unknown).

Remarks: The holotype of Paralbunea chani n. sp., is an intersex specimen, bearing well-developed gonopores on both the third and fifth pereopod coxae; however, the form of the telson is distinctly male when compared to males and females of other species in the genus. The holotype of P. chani n. sp. can be distinguished from each of the other species in the genus by several characters (those of other species in parentheses). This species differs from P. dayriti ( Serène and Umali, 1965) in having distal segments of the ocular peduncles indented at the tip (not indented), CG 1 anterior margin strongly concave (weakly concave), CG 4 lateral elements more than two times as long as those of P. dayriti, CG 4 medial elements as single row on each side of midline and more than two times as long as those of P. dayriti , pereopod 2 dactylus heel distally rounded (triangular), pereopod 3 dactylus heel more broadly rounded, pereopod 4 dactylus heel less produced, and male telson less medially expanded, with the distal margin rounded (truncate).

It differs from P. intermedia ( Balss, 1916) in having distal segments of the ocular peduncles with mesial margins convex (nearly straight) with small indentations at tip (no indentations), rostrum present (absent), CG 1 anterior margin concave (straight), CG 4 lateral elements more than two times as long as those of P. intermedia, CG 4 medial elements as single row on each side of midline and more than two times as long as of P. intermedia, CG 10 present as two small lateral elements (absent), pereopod 2 dactylus heel slightly more produced, pereopod 3 dactylus heel more produced, rounded, pereopod 4 dactylus heel more produced, rounded, and male telson more elongate, with the tip tapered.

It differs from P. manihinei Serène, 1977 in having distal ocular peduncles indented at tip (pointed at tip), rostrum with distal tooth (absent), CG 1 anterior margin concave (nearly straight), CG 4 lateral elements more than two times as long as those of P. manihinei, CG 4 medial elements as single row on each side of midline, more than two times as long as those of P. manihinei, CG 10 present as two small lateral elements (absent), pereopod 2 dactylus heel projection rounded (subquadrate), pereopod 3 dactylus heel slightly more produced, pereopod dactylus 4 heel with steeper slope, and male telson less expanded distally.

It differs from P. paradoxa ( Gordon, 1938) in having distal segments of the ocular peduncles tapered distally, triangular in shape (not tapered, subquadrate in shape), and pereopod 3 and 4 dactylus heels not rounded (acutely produced).

It differs from P. takedai Osawa and Fujita, 2012 in having evenly triangular distal ocular peduncles (laterally inflated, mesiodistally tapered), CGs present on the anterior carapace (absent), pereopod 2 dactylus heel produced but rounded (acute), pereopod 3 dactylus heel low, rounded (acutely produced), pereopod 4 dactylus heel low and rounded (acutely produced), and telson distal margin rounded (slightly concave).

Finally, P. chani n. sp. differs from P. chirotheca n. sp. described below in having triangular distal segments of the ocular peduncles (mitten-shaped), acute rostal spine (no spine), no spines lateral to the ocular sinus (those spines present), a long setal groove in the hepatic region nearly reaching the margin of the setal field (only small lateral element of the setal groove), medial CG 4 elements oblique (straight), perepods 2 and 3 dactyli with narrower indents, and pereopod 4 dactylus with steeper slope from heel to tip.

It is unfortunate that the type locality is so imprecise, owing to the collection of this specimen by a vessel for a local fishery.

Etymology: This species is named after Tin-Yam Chan ( NTOU) in thanks for his help in providing this specimen for study, as well as this excellent color photographs of several species discussed herein.

Paralbunea chirotheca n. sp. ( Fig. 3 ) urn:lsid:zoobank.org:act:28C4D464-C6B5-45D7-B076-FA87C94CA4EB

Type material: holotype female (7.4 mm CL × 8.2 mm CW), west of Baclayon, Bohol Island, Philippines, sta. T 6, coarse muddy sand with large sponges, 09°35.1'N, 123°51.2'E, 34–82 m, coll. PANGLAO 2004, 2 June 2004 ( ZRC 2016.0421).

Description: Carapace ( Fig. 3A ) wider than long. Anterior margin concave on either side of ocular sinus, becoming convex laterally, four or five small spines in concave region, two spines just lateral to concave region, ventral row of long plumose setae submarginally. Rostrum minute, low, broadly triangular, just reaching posterior margin of ocular plate. Ocular sinus smoothly concave, unarmed. Frontal region smooth; setal field broad posteriorly, narrowing anteriorly, with narrow lateral elements and slightly concave anterior margin. CG 1 parallel to anterior margin of carapace, sinuous, slightly crenulate, medial and curved lateral elements widely separate. Mesogastric region smooth; CG 2 absent; CG 3 present as two short oblique lateral elements; CG 4 fragmented into two short slightly oblique medial elements and two longer lateral elements. Hepatic region smooth, with short setose groove at median of lateral margin. Epibranchial region roughly triangular, smooth, posterolateral margin lined with short thick setae. Metagastric region smooth; CG 5 absent; CG 6 slightly crenulate, nearly contiguous except at midpoint; CG 7 as two oblique, short elements, separate from CG 6. Cardiac region smooth; CG 8 present as four short, widely separated elements; CG 9 present as two short, widely separated elements; CG 10 present as two long oblique elements; CG 11 absent. Branchial region without rows of setae, few posterior small setose punctae present. Posterior margin deeply and evenly convex, with submarginal groove barely reaching to margin of posterior concavity. Branchiostegite with strong anterolateral submarginal spine, anterior region with scattered short, transverse lines ventral to linea anomurica, with many short rows of setae and covered with long plumose setae ventrally, posterior region membranous, with numerous irregular fragments and covered with long plumose setae.

Ocular plate ( Fig. 3B ) triangular, with shallow median indentation. Median peduncular segments apparently lacking (or extremely weakly calcified). Distal peduncular segments rounded with strong distal indentation slightly off-center of median of distal margin (“mitten-shaped”), cornea at base of distal indentation, patch of pigment visible on ventral surface of peduncle, mesial margins approximated along short region of maximum convexity, margins with long plumose setae except in distal indentation, ventral surface with proximal transverse submarginal ridge lined with long plumose setae.

Antennule segment III narrow proximally, expanding distally to two times proximal width; plumose setae on dorsal and ventral margins; dorsal exopodal flagellum with 138 or 139 articles (n = 2), long plumose setae on dorsal and ventral margins; ventral endopodal flagellum with two articles (n = 2), plumose setae on dorsal and ventral margins. Segment II medially inflated in dorsal view, plumose setae on ventral margin and scattered on ventral half of surface. Segment I wider than long, unarmed, lateral surface with long plumose setae on dorsal quarter and on dorsal and ventral margins.

Antenna with segment V approximately two times longer than wide, long plumose setae on dorsal margin and few short setae on mediolateral surface, flagellum with eight articles (n = 2), long plumose setae on dorsal, ventral, and distal margins. Segment IV expanded distally, long plumose setae on dorsal and ventral margins, short simple setae on lateral surface. Segment III with long plumose setae on ventral margin, short simple setae on dorsal margin. Segment II short, widening distally, long plumose setae on margins and short plumose setae on lateral surface, antennal acicle long, thin, extending approximately one-half length of segment V, long plumose setae on dorsal margin. Segment I rounded proximally, flattened ventromesially, long plumose setae on margins and dorsolateral surface; lateral surface unarmed, without dorsolateral lobe.

Mandible incisor process with two teeth, cutting edge with two teeth. Palp three-segmented, with plumose setae on margins and long, thick, simple setae arising from bend in second segment.

Maxillule distal endite proximally narrow, widening to inflated distal end, with thick simple setae on distal margin and thin plumose setae on dorsal margin. Proximal endite with thick simple setae on distal margin. Endopodal external lobe truncate distally and curled under, notched proximally; internal lobe reduced with one thick seta at distolateral margin.

Maxilla exopod evenly rounded, with plumose setae along distal margin. Scaphognathite rounded on posterior lobe, with plumose setae.

Maxilliped I epipod with short plumose setae on margins and covering lateral surface. Endite tapered distally and subequal to first segment of exopod. Exopod with two segments; proximal segment narrow, margins parallel, with plumose setae; distal segment spatulate, approximately 1.5 times longer than wide, broadest medially, margins and lateral surface with long plumose setae. Endopod flattened and elongate, reaching to distal end of proximal exopodal segment, with plumose setae on surface, thick simple setae on mesial margin.

Maxilliped II dactylus evenly rounded, length equal to width, with thick simple setae distally and thin simple setae on distolateral surface. Propodus two times wider than long, with plumose setae on dorsal margin and long simple setae on distal margin. Carpus not strongly produced dorsodistally, approximately two times longer than wide, with long simple setae on dorsal and distal margins and in small patch on lateral surface. Merus approximately three times longer than wide, margins parallel, with long plumose setae on dorsal margin and scattered on surface, simple setae on ventral margin. Basis-ischium incompletely fused, with plumose setae on margins. Exopod greater than two times length of merus, flagellum with one elongate slender article.

Maxilliped III ( Fig. 3C ) dactylus rounded at tip, long plumose setae on margins and lateral surface. Propodus with longitudinal median row of long plumose setae on lateral surface, dorsal margin with long plumose setae, ventral margin with few short simple setae. Carpus weakly produced onto propodus, scarcely exceeding proximal margin of propodus, lateral surface with rows of long plumose setae medially, ventromedially, and tuft of long plumose setae distoventrally; long plumose setae on dorsal margin. Merus unarmed, distally slightly inflated, long plumose setae on margins and longitudinal row of short plumose setae on lateral surface. Basis incompletely fused with ischium; crista dentata absent. Exopod two-segmented, proximal segment small, distal segment styliform, tapering, approximately one-half length of merus, plumose setae on margins; flagellum absent.

Pereopod I ( Fig. 3D ) dactylus curved and tapering; lateral and mesial surfaces smooth; dorsal margin with long plumose and short simple setae, short simple setae on ventral margin. Propodus lateral surface with numerous short, transverse rows of setose rugae; dorsal margin unarmed; ventral margin distally produced into acute spine; cutting edge lacking teeth, lined with long plumose setae; dorsal and ventral margins with long plumose setae; patch of short plumose setae on lateral surface dorsally. Carpus with dorsodistal angle smoothly rounded; dorsal and distal margins with long plumose setae; oblique setose ridge in median of lateral surface; tuft of long plumose setae on ventral margin; mesial surface smooth. Merus unarmed; lateral surface without decalcified region but with scattered transverse rows of short plumose setae on ventral half, dorsomedial margin with long plumose setae; mesial surface without decalcified region, with few short transverse rows of setae scattered on surface. Basis-ischium incompletely fused, unarmed. Coxa unarmed.

Pereopod II ( Fig. 3E ) dactylus smooth; base to heel slightly concave, heel with smoothly rounded low spur, heel to tip broadly indented, tip subacute, tip to base broadly convex; lateral surface smooth, several widely spaced submarginal tufts of short setae dorsodistally; mesial surface smooth, ventral margin with long plumose setae, dorsal margin with row of long plumose setae from junction with propodus across heel. Propodal dorsal surface smooth, ventral margin proximally inflated and rounded; oblique row of long plumose setae on distal margin of lateral surface; distal and ventral margins with long plumose setae; dorsolateral surface as narrow, oblique, flattened shelf, short setae on dorsal margin and long plumose setae on ventral margin; mesial surface with elevated, curved, setose ridge from ventral junction with dactylus almost to ventral proximal junction with carpus. Carpus produced less than one-fourth over propodus, gently rounded dorsally, with rounded distoventral angle; lateral surface nearly smooth, with irregular, short interrupted row of rugae medially and submarginal elevated ridge ventrally, rugae and ridge with long plumose setae, margins with long plumose setae; mesial surface smooth, interrupted submarginal rows of long plumose setae dorsally, ventrally, and distally. Merus with medial decalcified area on lateral surface, long plumose setae on dorsodistal and ventromedial margins; mesial surface nearly smooth, with many short rows of long plumose setae. Basis-ischium incompletely fused and unarmed. Coxa unarmed.

Pereopod III ( Fig. 3F ) dactylus base to heel weakly concave, heel rounded and slightly produced, heel to indent nearly straight, indent broadly concave, tip subacute, tip to base smoothly convex; lateral surface smooth, dorsal margin with short simple and plumose setae, dorsodistal margin with tufts of short setae, ventral margin with long plumose setae, mesial surface smooth, row of plumose setae from junction with propodus to heel. Propodus weakly inflated; lateral surface smooth, long plumose setae distally, simple setae on margins, long plumose setae on ventral margin, dorsolateral surface narrow, oblique, flattened, with short plumose setae on margins; mesial surface with few long setae scattered on surface. Carpus produced dorsodistally, inflated, reaching one-third across propodus, broadly rounded, dorsolateral margin unarmed; lateral surface smooth, with mat of short simple setae covering distal half of surface; with two long rows of setae medially; mesial surface smooth, distal and oblique rows of long plumose setae. Merus smooth, dorsal and ventral margins unarmed, dorsodistal and ventromesial margins with long plumose setae; lateral surface with large medial decalcified area and few long plumose setae; mesial surface smooth, with few scattered setae. Basis-ischium incompletely fused and unarmed. Coxa unarmed. Female with large gonopore on median mesial surface of coxa, surrounded with short plumose setae.

Pereopod IV ( Fig. 3G ) dactylus with base to heel concave, heel low, heel to tip convex to straight, tip acute, tip to base straight distally, becoming broadly convex proximally; lateral surface smooth, ventral margin with long plumose setae, dorsal margin with short simple setae; mesial surface with median decalcified area, demarcated ventrally by longitudinal elevated ridge with row of long plumose setae, setose punctae ventral to decalcified window. Propodus expanded dorsally and ventrally, ventral expansion not reaching ventral margin of dactylus, margins with long plumose setae, dorsal expansion with row of long plumose setae dorsally and mat of short setae ventrally; lateral and mesial surfaces smooth. Carpus not produced dorsodistally, small mat of setae along distal half of dorsal margin; lateral and mesial surfaces smooth, mesial surface with medial decalcified area, dorsal margin with short simple and long plumose setae, ventral margin with short plumose setae. Merus lateral surface with few scattered short transverse rows of setae, dorsal and ventral margins with long plumose setae; proximal fourth of mesial surface with large decalcified window. Basis-ischium incompletely fused and unarmed. Coxa unarmed.

Abdomen ( Fig. 3H ) with somite I wider than long, widest posteriorly; dorsal surface with anterior margin concave, posterior margin concave, with submarginal elevated and curved row of short setae, few scattered setose punctae proximolaterally, small transverse decalcified submedial windows present. Somite II dorsal surface with submarginal transverse ridge anteriorly, patch of setae at posterolateral angle, extending onto pleura posteromesially; pleura expanded and directed laterally, anterolateral and posterolateral margins rounded, anterior and lateral margins with long plumose setae, posterior margin with short setae. Somite III similar to somite II, but narrower and shorter, small patch of short thick setae on posterolateral angle; pleura thinner and shorter than that of somite II, directed posterolaterally, with setae as in somite II, anterolateral angle subacute, dorsal surface obliquely flattened anterolaterally, with submarginal row of short simple setae. Somite IV similar to somite III, but thinner and shorter; pleura thinner and shorter than that of somite III, directed slightly posterolaterally, dorsal surface obliquely flattened anterolaterally, with submarginal row of short simple setae, margins with long plumose setae. Somite V longer than somite IV, lateral margins with plumose setae; pleura absent. Somite VI wider and longer than somite V, dorsal surface with two short oblique rows of setae laterad of midline anteriorly, posterior margins with few long plumose setae; pleura absent.

Female with uniramous, paired pleopods on somites II– V.

Telson ( Fig. 3H ) spatulate, rounded distally, evenly calcified, margins with long plumose setae; median longitudinal groove short, on medial half of surface, and with short simple setae along margins; few short simple setae at proximolateral corners.

Range: Known only from the type locality off Bohol Island, Philippines.

Remarks: The holotype of P. chirotheca n. sp. can be distinguished from each of the other species in the genus by several characters (those of other species in parentheses). It differs from P. dayriti in having mitten-shaped distal segments of the ocular peduncles (laterally inflated triangles), CG 4 consisting of two short lateral and two short medial elements (two short lateral and four short medial elements), and pereopod 2 and 3 dactylus heels much less produced.

Paralbunea chirotheca n. sp. differs from P. intermedia in having mitten-shaped distal segments of the ocular peduncles (laterally inflated triangles), CG 1 broader, CG 4 with two lateral and two medial elements (no lateral and four medial elements), CG 10 present (absent), pereopod 2 and 3 dactylus heels more produced, and telson more tapered.

It differs from P. manihinei in having mitten-shaped distal segments of the ocular peduncles (tapered), CG 4 with two short lateral and two short medial elements (two short lateral and four short medial elements), CG 8 with four medial elements (two medial elements), and CG 10 present (absent).

The new species differs from P. paradoxa in having distal segments of the ocular peduncles mitten-shaped (subquadrate) and pereopod 3 and 4 dactylus heels rounded (acutely produced).

Finally, the new species differs from P. takedai in having distal segments of the ocular peduncles mitten-shaped (laterally inflated and mesiodistally tapered) and pereopod 2 and 3 dactylus heels rounded (acute). Differences between P. chirotheca n. sp. and P. chani n. sp. are given in the Remarks for the latter species.

Etymology: The specific name (L., chirotheca = glove; feminine) is given for the distinctive mitten-like shape of the distal segments of the ocular peduncles.

Figures

Fig. 2. Paralbunea chani n. sp., holotype intersex specimen, 13.6 mm CL (NTOU A01450). A, habitus. B, ocular peduncles and median frontal margin. C, left maxilliped III. D, right pereopod I. E, left pereopod II dactylus and propodus. F, right pereopod III dactylus and propodus. G, right pereopod IV dactylus and propodus. H, abdominal somite VI, uropods and telson. Scale bars: A = 2 mm; B–H = 1 mm. Habitus photograph courtesy of Tin-Yam Chan.

Fig. 1. A, Albunea microps Miers, 1878, male, CL unknown (fragmented when examined) (ZRC 2016.0115). B, Albunea symmysta (Linnaeus, 1758), female, 19.0 mm CL (ZRC 2016.0114). Photographs courtesy of Tin-Yam Chan.

Fig. 3. Paralbunea chirotheca n. sp., holotype female (ZRC 2016.0421). A, habitus. B, ocular peduncles and median frontal margin. C, right maxilliped III. D, right pereopod I. E, right pereopod II. F, right pereopod III. G, left pereopod IV. H, abdominal somites, uropods and telson. Scale bars = 1 mm. Habitus photograph courtesy of Tin-Yam Chan.