Makraleptochelia potiguara, Araújo-Silva, Catarina De L. & Larsen, Kim, 2012

Araújo-Silva, Catarina De L. & Larsen, Kim, 2012, Tanaidacea (Tanaidacea: Crustacea) from Brazil. IV. A new genus and two new species from the family Leptocheliidae, Zootaxa 3523, pp. 1-19 : 3-13

publication ID	https://doi.org/ 10.5281/zenodo.282687
DOI	https://doi.org/10.5281/zenodo.6170554
persistent identifier	https://treatment.plazi.org/id/03C0879B-6D41-FF88-4682-45560D56FD55
treatment provided by	Plazi
scientific name	Makraleptochelia potiguara
status	sp. nov.

Treatment

Makraleptochelia potiguara View in CoL n. sp.

( Figs. 1–6 View FIGURE 1 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 )

Material examined. Holotype: female with oostegites (REG# MOUFPE 14.370), body length 4.4 mm. Station NE IV #141 (04°91’S 035°22’W). Type-locality: Rio Grande do Norte State [RN], Brazil. Depth: 43 m, 22 November 2000. Allotype: adult male (REG# MOUFPE 14.851), body length 12.5 mm. Station PAI #081 CES 32 R3 (0–10 cm) (03°00’S 038°51’W). Locality: Ceará State [CE], Brazil. Depth: 58 m, 8 July 2009.

Paratypes: one female with oostegites (dissected) (REG# MOUFPE 15.068), and two females without oostegites (REG# MOUFPE 14.371), same locality as holotype. One female without oostegites (REG# MOUFPE 14.372); station NE III #180 (011°55’S 037°23’W), 19 July 1998. Four females without oostegites (REG# MOUFPE 14.373); station NE I #243 (09°17’S 034°91’W), 24 October 1995. One female without oostegites (REG# MOUFPE 14.374); station NE IV #131 (02°23’S 039°89’W), 20 November 2000. One female without oostegites (damaged), (REG# MOUFPE 14.375); station NE IV #165 (08°13’S 034°63’W), 1 December 2000. Two females without oostegites (damaged), (REG# MOUFPE 14.376); station NE IV #178 (011°27’S 037°02’W), 3 December 2000. Specimens were collected in sandy sediments, sorted from algae and sponges; between 37–71.6 m depth. Locality: Ceará to Bahia State [BA], Brazil.

Etymology. The name reflects the native people in the state of Rio Grande do Norte, “ potiguar ”, where the holotype was collected.

Description. Based on holotype (4.4 mm) and paratype, female with oostegites.

Body ( Fig. 1 View FIGURE 1 A & 1B): dorsoventrally flattened, about 5.5 times as long as wide.

Cephalothorax: about 1.1 times as long as wide, about 1.5 times as long as two first pereonites combined, six simple setae on each anterolateral margin. Rostrum rounded. Ocular lobes triangular with visual elements. Carapace dorsal suture absent.

Pereon: about 3.7 times as long as wide and about 60% of total body length. Pereonites 1 and 2 subequal length, except for pereonite 1 with two pairs of simple setae on each antero- and posterolateral margin. Pereonites 3 and 6 of subequal length, except for pereonite 6 with three simple setae on each anterolateral margin and one simple setae on dorsal margin. Pereonites 4 and 5 longest, with three simple setae on each anterolateral margin and one simple seta on dorsal margin.

Pleon: broader than cephalothorax and pereon, about 1.1 times as wide as long, about 21% of total body length. Pleonites subequal with one simple seta on each lateral margin. Pleotelson about 2.2 times as wide as long, with one simple and one setulated seta on dorsomedial margin and two pairs of terminal simple setae.

Antennule ( Fig. 2 View FIGURE 2 H): of four articles (terminal article reduced), about 0.7 times as long as cephalothorax. Article 1 stout, about 1.8 times as long as wide and 1.6 times as long as two following articles, with two simple and several setulated setae on dorsal margin, one medial simple seta on ventral margin. Article 2 about 1.2 times as long as wide, a row of distal fine setules, one simple seta on dorsodistal margin, one setulated and one simple seta on ventrodistal margin. Article 3 as long as article 2, with two distal simple setae. Terminal article with five simple setae, one setulated and one aesthetasc.

Antenna ( Fig. 2 View FIGURE 2 I): of six articles (terminal article reduced), about 0.7 times as long as antennule. Article 1 naked, as long as article 2. Article 2 with two dorsodistal simple setae and one ventrodistal simple seta, dorsal margin with large process and bearing a row of short spines. Article 3 shortest, with three simple setae on dorsodistal margin. Article 4 as long as two first articles combined, ventrodistal margin with one pair of simple and setulated setae, dorsomedial margin with subdistal scales, one simple and one setulated seta, dorsodistal margin with one setulated and one simple seta. Article 5 with two distal simple setae and one setulated seta. Terminal article with five simple setae.

Mouthparts ( Fig. 2 View FIGURE 2 A–F): labrum ( Fig. 2 View FIGURE 2 A) rounded with several fine setules on distal and lateral margins. Mandibles ( Fig. 2 View FIGURE 2 B, C) molar process broad with serrate edges. Left mandible ( Fig. 2 View FIGURE 2 B) lacinia mobilis slightly longer than incisor, with apparently five denticles on distal margin, incisor crenulate. Right mandible ( Fig. 2 View FIGURE 2 C) incisor crenulate with several denticles on distal margin. Labium ( Fig. 2 View FIGURE 2 D) with two pairs of lobes, distal margins with several setae. Maxillule ( Fig. 2 View FIGURE 2 E) palp not recovered; endite with several fine setules on lateral margins, 12 distal spiniform setae. Maxilla not recovered. Maxilliped ( Fig. 2 View FIGURE 2 F) endite with several fine setules on outer distal margin, three complex setae and one denticle on inner distal margin; basis about twice as long as wide, with six distal simple setae. Palp article 1 naked, about 1.3 times as long as article 2; article 2 with one simple seta on outer distal margin, five simple setae on inner distal margin; article 3 longest, about 1.2 times as long as article 1, with five simple and three serrated setae on inner margin; article 4 with two simple and nine serrated setae on inner margin. Epignath not recovered.

Cheliped ( Fig. 1 View FIGURE 1 C): attached via sclerite, with three proximal simple setae. Basis about 1.7 times as long as wide, with one dorsodistal seta mounted on tubercle. Merus triangular with 14 ventral simple setae. Carpus stout, about 1.6 times as long as wide, carpus outer ventrodistal margin extended as ‘shield’ overlapping propodus, slightly longer than basis, with four dorsoproximal short simple setae and one simple on dorsodistal margin, three ventromedial simple setae. Propodus about 1.6 times as long as wide, with several fine simple setules, six inner bipinnate setae on dorsal margin and one ‘S’ shaped simple seta next to insertion of dactylus. Fixed finger with carina and three simple setae on inner margin, two ventral simple setae. Dactylus and unguis naked.

Pereopod 1 ( Fig. 3 View FIGURE 3 A): longer and slender than other pereopods. Coxa with one simple seta. Basis about four times as long as wide, with one simple seta and one setulated seta on dorsoproximal margin. Ischium with two ventral simple setae. Merus about 3.4 times as long as wide, with one ventrodistal simple seta. Carpus as long as merus, with two dorsodistal simple setae and three simple on ventrodistal margin. Propodus as long as carpus, with scales on dorsal margin, with four simple and two bipinnate setae on dorsodistal margin, one ventrodistal simple seta. Dactylus and unguis combined about 1.5 times as long as propodus. Unguis about 60% of combined dactylus and unguis length.

Pereopod 2 ( Fig. 3 View FIGURE 3 B): coxa as pereopod 1. Basis about three times as long as wide, with one simple seta and two dorsomedial setulated setae. Ischium as pereopod 1. Merus about 1.8 times as long as wide, with fine simple setules on ventrodistal margin. Carpus slightly shorter than merus, with one dorsodistal simple seta, fine setules and two simple setae on ventrodistal margin. Propodus about 2.8 times as long as wide and 1.5 times as long as dactylus and unguis combined, with scales on dorsal margin, a row of ventral short spines, one simple seta, dorsodistal margin with one bipinnate seta and one short spiniform seta, ventrodistal margin with one pair of simple setae, one spiniform seta and another pair of bipinnate setae. Dactylus and unguis combined about 0.4 times as long as dactylus/unguis of pereopod 1. Unguis as long as dactylus.

Pereopod 3 ( Fig. 3 View FIGURE 3 C): as pereopod 2 except carpus with one pair of simple setae on each distal margin. Propodus about 2.3 times as long as wide.

Pereopod 4 ( Fig. 3 View FIGURE 3 D): no visible coxa. Basis stout, about 1.5 times as long as wide, with three dorsomedial setulated setae and another two setulated on ventromedial. Ischium with two ventral simple setae. Merus about twice as long as wide, with several scales, and two spiniform setae with medial ring of spinules on ventrodistal margin. Carpus robust, about 1.3 times as long as wide and about 1.2 times as long as merus, with several ventral scales and fine simple setules, and three ventrodistal spiniform setae. Propodus slightly longer than carpus, with scales and fine simple setules on ventral margin, two ventrodistal spiniform setae, dorsodistal margin with one pair of serrated setae and another pair of bipinnate setae. Dactylus with one dorsoproximal simple seta. Unguis incompletely fused with dactylus.

Pereopod 5 ( Fig. 3 View FIGURE 3 E): as pereopod 4 except merus with two ventrodistal spiniform setae. Carpus with two dorsodistal simple setae and two ventrodistal spiniform setae with medial ring of spinules. Propodus with one short spiniform seta and three serrated setae on dorsodistal margin, and two circumplumose spiniform setae on ventrodistal margin.

Pereopod 6 ( Fig. 3 View FIGURE 3 F): as pereopod 5 except basis about 1.7 times as long as wide, with one dorsomedial simple seta. Carpus with one dorsodistal simple seta. Propodus with six dorsodistal serrated setae and two ventrodistal spiniform setae.

Pleopods ( Fig. 1 View FIGURE 1 D): basal article short and naked. Exopod with 22 plumose setae. Endopod with one outer and 17 inner plumose setae, distal seta with serrated apex.

Uropod ( Fig. 2 View FIGURE 2 G): basal article naked. Endopod of four articles; article 1 with one simple and one setulated seta; article 2 with one simple seta; article 3 with one pair of setulated and another pair of simple setae; article 4 with two setulated and four simple setae. Exopod uniarticulate, about 1.6 times as long as first endopod article, with one medial and two distal simple setae.

Description of male allotype: adult of 12.5 mm (partly dissected).

Body ( Fig. 4 View FIGURE 4 A & 4B): dorsoventrally flattened, slender and about 18.5 times as long as wide.

Cephalothorax: about twice as long as wide and 1.4 times as long as pereonite 1. Widest at mid-length. Rostrum pronounced and tapering into a blunt apex. Triangular eye-lobes and visual elements present. With eight short simple setae on each lateral margin.

Pereon: naked, extremely elongate, about 15 times as long as wide and 80% of total body length. Pereonites 1–3 not reduced. Pereonite 1 shorter than other pereonites, about 1.5 times as long as wide. Pereonites 2 and 6 subequal, about 1.5 times as long as pereonite 1 and shorter than pereonites 3–5. Pereonites 3 and 4 subequal. Pereonite 5 longest, about 4.2 times as long as wide.

Pleon: naked, about 1.7 times as long as wide and 10% of total body length. Pleonites short, about four times as wide as long. Pleotelson about twice as wide as long, with two dorsal setulated setae and two pairs of terminal simple setae.

Antennule ( Fig. 5 View FIGURE 5 A): of 13 articles. Article 1 about twice as long as wide and about 0.3 times as long as cephalothorax, with two dorsomedial setulated setae, ventrodistal margin with five setulated and two simple setae. Article 2 about 1.6 times as long as wide and 0.8 times as long as article 1, ventrodistal margin with one simple seta and three setulated setae. Article 3 bearing covering first of serially repeating articles, with one dorsodistal simple seta and several aesthetascs on ventrodistal margin, also with process bearing one dorsodistal simple seta and ventrodistal aesthetascs. Serially repeating articles subequal with a row of ventrodistal aesthetascs. Terminal article with five simple setae, two setulated and four aesthetascs.

Antenna ( Fig. 5 View FIGURE 5 B): of six articles (terminal article minute), as long as two first antennule articles. Article 1 naked. Article 2 dorsal margin with process and bearing a row of short spines and fine simple setae, with one dorsodistal simple seta, ventrodistal margin with one spiniform and one simple seta. Article 3 with one dorsodistal simple seta. Article 4 longest, about 3.2 times as long as wide, slightly shorter than articles 1–3 combined, with one dorsomedial simple seta, ventral margin with three medial setulated setae, three simple and three setulated setae distally. Article 5 about 0.5 times as long as article 4, with two ventrodistal simple setae. Terminal article with six simple setae.

Mouthparts ( Fig. 5 View FIGURE 5 C, D): labrum, mandibles and labium reduced. Maxilliped ( Fig. 5 View FIGURE 5 C) basis robust, longer than wide, distal margin with six long setae on one endite and seven on the other. Palp biarticulate, both naked. Epignath ( Fig. 5 View FIGURE 5 D) elongate, naked.

Cheliped ( Fig. 4 View FIGURE 4 C): attached via sclerite, with three proximal simple setae. Basis stout, 2.1 times as long as wide, with one dorsodistal simple seta. Merus triangular, with 13 ventral simple setae. Carpus stout, about 1.3 times as long as wide, outer ventrodistal margin slightly extended as ‘shield’ overlapping propodus, dorsal margin with four medial simple setae and one simple distally, three ventromedial simple setae. Propodus about 2.1 times as long as wide, slightly longer than carpus, with a row of inner distal spiniform setae (≈ 26) and one dorsodistal ‘S’ shaped simple seta next to dactylus insertion. Fixed finger short, with two ventral simple setae and three simple on inner margin. Dactylus about three times as long as fixed finger, with five inner denticles; i.e. cheliped of subchelate form.

Pereopod 1 ( Fig. 5 View FIGURE 5 F): coxa with one simple seta. Basis about 3.8 times as long as wide, with two ventroproximal setulated setae. Ischium with two ventral simple setae. Merus about 3.3 times as long as wide, with one ventrodistal spiniform seta. Carpus as long as merus, with three simple setae and one spiniform seta on dorsodistal margin, ventrodistal margin with one bipinnate seta and two simple setae. Propodus longer than carpus, about 5.7 times as long as wide, with scales on each margin, with three dorsodistal simple setae and one ventrodistal spiniform seta. Dactylus and unguis combined about 0.7 times as long as propodus, dactylus with short spines on proximal margin. Unguis as long as dactylus.

Pereopod 2 ( Fig. 5 View FIGURE 5 G): as pereopod 1 except basis slightly shorter, about 3.3 times as long as wide, with three setulated setae and one simple seta on dorsoproximal margin. Merus with scales and one spiniform seta on dorsodistal margin. Carpus with scales on each lateral margin, with one dorsodistal spiniform seta, ventrodistal margin with one simple seta and two spiniform setae. Dactylus and unguis combined about 0.5 times as long as propodus, with fine simple setules. Unguis about 0.8 times as long as dactylus.

Pereopod 3 ( Fig. 6 View FIGURE 6 A): as pereopod 2 except basis with one simple and one setulated seta on dorsoproximal margin. Merus with one ventrodistal spiniform seta.

Pereopod 4 ( Fig. 6 View FIGURE 6 B): no visible coxa. Basis about twice as long as wide, with three dorsoproximal setulated setae and one ventromedial setulated seta. Ischium with two ventral simple setae. Merus about 2.3 times as long as wide, with fine distal simple setules on ventral margin. Carpus as long as merus, with fine distal simple setules, two dorsodistal simple setae, ventrodistal margin with three serrated spiniform setae and one simple seta. Propodus about 6.5 times as long as wide and slightly shorter than basis, with several short spines on subdistal margin, four dorsodistal simple setae, two ventrodistal spiniform setae. Dactylus about 80% of total dactylus and unguis combined length, with short spines on all ventral margin. Unguis minute.

Pereopod 5 ( Fig. 6 View FIGURE 6 C): as pereopod 4 except basis with four dorsoproximal setulated setae, two ventromedial setulated setae. Merus with two ventrodistal circumplumose spiniform setae and scales. Carpus with three dorsodistal simple setae. Propodus with three dorsodistal simple setae and two ventrodistal serrated setae. Dactylus with three ventrodistal simple setules.

Pereopod 6 ( Fig. 6 View FIGURE 6 D): as pereopod 5 except basis about 2.5 times as long as wide, with three dorsoproximal setulated setae and one ventromedial simple seta. Merus with two ventrodistal serrated spiniform setae. Carpus with two ventrodistal serrated spiniform setae. Propodus about 5.6 times as long as wide, with four dorsodistal serrated spiniform setae and two spiniform setae on ventrodistal margin. Dactylus slightly shorter than pereopods 4–5.

Pleopods ( Fig. 4 View FIGURE 4 D): basal article naked. Exopod with 20 plumose setae. Endopod with one outer medial seta and 16 plumose setae on inner margin, distal seta with serrated apex.

Uropod ( Fig. 5 View FIGURE 5 E): basal article with four simple setae and one setulated seta. Endopod of three articles; article 1 with fusion line, three simple and two setulated setae on medial margin, three simple setae and one setulated seta distally; article 2 with two simple and two setulated setae; article 3 with fusion line, five simple setae and one setulated seta. Exopod uniarticulate with fusion line, 0.7 times as long as endopod article 1, with three simple setae.

Geographical distribution. Type material was found with a large distribution range on the northeastern coast of Brazil, from Ceará [CE] to Bahia State [BA].

Remarks. Recently, Edgar (2012) described Parakonarus robertsoni collected on Seven Mile Beach, Australia, which has close affinities to the female of M. potiguara in having a cheliped merus with about 11 ventral simple setae (13–14 in M. potiguara ), four distal simple setae on maxilliped basis (six in M. potiguara ), pereopods 1–3 ischia with one ventral simple seta (in M. potiguara all pereopod ischia with two ventral simple setae), uropod endopod with six articles (four in M. potiguara ).

Even though the female and male was collected in different stations and years, they overlap the same distribution on northeastern coast of Brazil and share many morphological similarities as the: cephalothorax setae, lack of antennal spiniform setae, setae number of the 1) maxillipedal basis, 2) cheliped sclerite, basis, merus, and carpus, 3) pereopodal ischium. These characters convince us that the male and female are of the same species.

Although the males of Konarus species are unknown and therefore cannot be compared and the females morphologically are similar to Makraleptochelia , it seems that Konarus – Parakonarus group is restricted to Indo- Pacific waters. Therefore, in addition of the morphologic differences described above, we are convinced that these are separate genera.

Genus Intermedichelia Gu ţ u, 1996

Diagnosis. Female (modified from Guţu 1996). Body slender, about seven or eight times as long as wide, with an acute lateral prolongation on pereonite 3 with one or two distal simple setae. Cephalothorax as long as two first pereonites combined. Eyes present. Antennule with four articles (terminal article reduced), article 1 longest. Antenna with six articles (terminal article reduced); article 2 with one spiniform seta on dorsodistal margin; article 3 with one distal simple seta. Mandible with strong molar process with numerous notches on masticatory margin. Maxilliped basis with two or three distal simple setae; endite with two flattened/complex setae. Cheliped basis about twice as long as wide; fixed finger with three inner and two ventral simple setae. Pereopod 1 dactylus and unguis combined longest, about 1.6 times as long as propodus and about 28% of pereopod 1 total length. Pereopod 3 with one ventrodistal spiniform seta on merus, carpus and propodus or spiniform seta absent. Pereopods 4 and 5 basis 1.5 to 2.5 times as long as wide; propodus dorsodistal simple seta either marginally longer than- or about twice as long as dactylus and unguis combined. Uropod exopod with one or two articles; endopod with five articles.

Generic remarks. The genus Intermedichelia was monotypic, herein we expand with other characters found on I. jesseri n. sp.