Trichopeltarion janetae, Ahyong, 2008

Ahyong, Shane T., 2008, Deepwater crabs from seamounts and chemosynthetic habitats off eastern New Zealand (Crustacea: Decapoda: Brachyura), Zootaxa 1708 (1), pp. 1-72 : 17-25

Trichopeltarion janetae sp. nov.

( Figs 7–11 , 28D )

Trichopeltarion sp. — Poore et al. 1998: 68, 72. — Poore 2004: 400, fig. 123b, pl. 22a.

Type material. HOLOTYPE: NIWA 29655 , male (cl 28.0 mm, cw 26.3 mm), Gothic Seamount, 42°43.62’S, 179°53.88’W, 992–1120 m, TAN0604/105, 4 Jun 2006 . PARATYPES: Gothic Seamount: NIWA 34982 , 4 females (cl 12.3–26.5 mm, cw 11.1–25.3 mm), type locality ; NIWA 29656 , 1 male (cl 13.4 mm, cw 11.9 mm) , 2 females (cl 17.0– 18.9 mm, cw 16.3–18.5 mm; larger ovigerous), 42°43.61’S, 179°53.97’W, 1030–1156 m, TAN0604/106, 5 Jun 2006; NIWA 29661 , 1 male (cl 12.3 mm, cw 11.5 mm), 42°43.62’S, 179°53.90’W, 990– 1040 m, TAN0604/112, 7 Jun 2006 ; NIWA 29662 , 1 male (cl 27.7 mm, cw 26.0 mm) , 2 females (cl 17.0 mm, cw 16.3 mm; 1 crushed), 42°43.65’S, 179°53.94’W, 1000–1107 m, TAN0604/113, 7 Jun 2006; NIWA 34980 , 3 males (cl 18.2–22.9 mm, cw 17.8–22.7 mm; largest with rhizocephalan) , 4 females (cl 9.8–22.5 mm cw 9.0– 22.1 mm), 42°43.79’S, 179°53.4’W, 1130– 1000 m, TAN0104/152, 18 Apr 2001; NIWA 34981 , 9 males (cl 10.1–23.6 mm, cw 9.9–23.3 mm) , 7 females (cl 9.5–23.4 mm cw 9.0– 23.2 mm), 42°43.95’S, 179°53.91’W, 1076– 990 m, TAN0104/153, 18 Apr 2001; ZRC 2008.0007 , 1 male (cl 25.2 mm, cw 24.1 mm), 1 ovigerous female (cl 21.0 mm cw 9.0– 20.6 mm), 42°43.95’S, 179°53.91’W, 1076– 990 m, TAN0104/153, 18 Apr 2001 .

Other material examined. Otara Seamount: NIWA 6710 , 1 male (cl 14.4 mm, cw 13.8 mm), 36°57.57– 57.69’S, 177°19.92–19.54’E, 1396–1462 m, TAN0413/35, 9 Nov 2004 .

Whakatane Seamount: NIWA 6709, 1 ovigerous female (cl 19.5 mm, cw 18.4 mm), 36°46.19–46.51’S, 177°28.39–28.64’E, 1506– 1491 m, TAN0413/18, 8 Nov 2004.

Rock Garden Cold Seep: NIWA 32007 , 1 female (cl 21.3 mm, cw 20.1 mm), 39°58.64–58.63’S, 178°14.14–14.17’E, 907–908 m, SO191-3/238, 6 Mar 2007 .

Moa cold seep, Omakere Ridge : NIWA 32005 , 1 male (cl 26.5 mm, cw 26.0 mm; with rhizocephalan), 40°03.33’S, 177°48.81’E, 1111–1120 m, SO191-3/218, 4 Mar 2007 .

LM-9 cold seep, Omakere Ridge: NIWA 32010 , 1 male (cl 32.4 mm, cw 30.3 mm), 40° 03.191 –03.193 ’S, 177° 49.092 –49.136 ’E, 1109–1112 m, SO191-2/165, 22 Feb 2007 ; NIWA 32001 , 1 ovigerous female (cl 26.9 mm, cw 26.7 mm), 40°03.19–03.18’S, 177°44.12–49.37’E, 1106– 1098 m, SO191-2/87, 12 Feb 2007 ; NIWA 32000 , female (cl 30.7 mm, cw 30.0 mm), 40°03.24–03.26’S, 177°48.74–48.75’E, 1119–1120 m, SO191-3/ 87, 5 Mar 2007 .

Shipley Seamount: NIWA 29655 , 2 males (cl 15.9–26.3 mm, cw 14.6–25.1 mm), 41°48.07’S, 179°29.61’W, 1260– 1240 m, TAN0604/133, 9 Jun 2006 .

Morgue Seamount: NIWA 34991 , 1 female (damaged; cl ~ 25 mm; with rhizocephalan), 42°43.02’S, 179°57.60’W, 1162– 980 m, TAN0104/149, 18 Apr 2001 ; NIWA 29369 , 1 female (cl 26.3 mm, cw 25.9 mm), 42°43.20’S, 179°57.63’W, 1012– 890 m, TAN0104/399, 21 Apr 2001 .

Pyre Seamount: NIWA 29647 , 1 male (cl 14.2 mm, cw 12.9 mm), 42°43.04’S, 179°54.38’W , 1050–1140

m, TAN0604/53, 31 May 2006; NIWA 29653, 1 female (cl 18.2 mm, cw 18.0 mm), 42°43.06’S, 179°54.29’W, 1025–1156 m, TAN0604/102, 4 Jun 2006; NIWA 29654, 1 female (cl 15.7 mm, cw 15.0 mm), 42°42.97’S, 179°54.34’E, 1005–1070 m, TAN0604/104, 4 Jun 2006; NIWA 27538, 1 male (cl 18.4 mm, cw 17.7 mm), 4 females (cl 14.6–19.4 mm, cw 14.3–18.9 mm), 1 ovigerous female (cl 17.28 mm, cw 16.70 mm), 42°43.09–43.18’S, 179°54.57–54.87’E, 1075– 1008 m, TAN0104/333, 20 Apr 2001; NIWA 34987, 1 male (cl 25.0 mm, cw 24.0 mm), 42°42.98’S, 179°54.69’W, TAN0104/397, 21 Apr 2001.

Zombie Seamount: NIWA 29641 , 3 males (cl 13.2–21.9 mm, cw 12.2–20.8 mm), 6 females (cl 8.6–26.5 mm, cw 7.7–26.1 mm), 42°45.76’S, 179°55.51’W, 1019–1081 m, TAN0604/09, 28 May 2006 ; NIWA 29644 , 1 female (cl 8.3 mm, cw 7.3 mm), 42°45.96’S, 179°55.57’W, 906–1061 m, TAN0604/21, 29 May 2006 ; NIWA 29645 , 2 females (cl 14.0– 14.6 mm, cw 13.4–13.5 mm), 42°45.93’S, 179°55.6’E, 930–1090 m, TAN0604/38, 30 May 2006 ; NIWA 29646 , 1 female (cl 20.8 mm, cw 19.7 mm), 42°45.99’S, 179°55.6’W, 932–1070 m, TAN0604/44, 31 May 2006 ; NIWA 27540 , 2 males (cl 14.8–23.5 mm, cw 13.3–21.7 mm), 2 females (cl 18.5–22.5 mm, cw 17.7–21.7 mm), 42°46.07’S, 179°55.31’E, 955– 890 m, TAN0104/336, 24 Apr 2001 ; NIWA 34986 , 1 male (cl 24.2 mm, cw 22.5 mm), 2 females (cl 18.7–19.8 mm, cw 18.3–19.6 mm), 42°46.00’S, 179°55.36’W, 970– 900 m, TAN0104/337, 20 Apr 2001 ; NIWA 27851 , 4 females (cl 13.7–21.4 mm, cw 12.8–20.9 mm; largest ovigerous), 42°46.13’S, 179°55.68’W, 987– 895 m, TAN0104/197, 18 Apr 2001 ; NIWA 34984 , 2 females (cl 25.0– 28.4 mm, cw 23.5–27.2 mm), 42°45.92’S, 179°55.62’W, 1058– 990 m, TAN0104/198, 19 Apr 2001 .

Scroll Seamount: NIWA, 2 males (cl 14.4–15.9 mm, cw 12.7–15.0 mm), 42°47.14’S, 179°59.85’E, 898– 1067 m, TAN0604/08, 28 May 2006 .

Diabolical Seamount: NIWA 29650 , male (cl 27.9 mm, cw 27.3 mm), 42°47.48’S, 179°59.28’W, 882– 1000 m, TAN0604/97, 4 Jun 2006 ; NIWA 29649 , 3 females (cl 21.5–23.5 mm, cw 21.1–23.7 mm), 42°47.48’S, 179°59.28’W, 882–1000 m, TAN0604/97, 4 Jun 2006 ; NIWA 29652 , 1 juvenile female, 42°47.33’S, 179°59.11’W, 960–1036 m, TAN0604/98, 4 Jun 2006 ; NIWA 29648 , 2 juvenile males (cl 9.6– 10.0 mm, cw 8.9–9.1 mm), 42°47.44’S, 179°59.21’W, 1030–1156 m, TAN0604/96 ; NIWA 34985 , 2 females (cl 11.1–14.3 mm, cw 10.6–13.9 mm), 42°47.68’S, 179°58.95’W, 1045– 900 m, TAN0104/46, 16 Apr 2001 ; NIWA 34990 , 1 female (cl 21.5 mm cw 20.1 mm), 1 carapace (cl 19.3, cw 19.1 mm), 42°47.57’S, 179°58.86’W, 950– 900 m, TAN0104/47, 16 Apr 2001 ; NIWA 34988 , 5 males (cl 13.1–23.5 mm, cw 12.6– 22.8 mm), 7 females (cl 16.0– 24.5 mm cw 15.6–24.0 mm), 1 carapace (cl 19.3, cw 19.1 mm), 42°47.17– 46.96’S, 179°59.11–59.01’W, 993– 900 m, TAN0104/48, 16 Apr 2001 .

Ghoul Seamount: NIWA 29664 , 1 female (cl 12.3 mm, cw 11.7 mm), 42°47.85’S, 179°59.26’E, 925– 1054 m, TAN0604/118, 7 Jun 2006 ; NIWA 29659 , 1 male (cl 16.6 mm, cw 16.1 mm), 3 females (cl 15.3–26.6 mm, cw 14.8–26.6 mm), 42°47.85’S, 179°59.26’E, 970–1040 m, TAN0604/111, 7 Jun 2006 ; NIWA 34983 , 1 male (cl 23.5 mm, cw 21.6 mm), 1 female (cl 10.9 mm, cw 10.8 mm), 42°47.84’S, 179°58.91’E, 1000– 922 m, TAN0104/116, 17 Apr 2001 .

Graveyard Seamount: NIWA 29643 , 1 ovigerous female (cl 27.8 mm, cw 26.8 mm), 42°45.45’S, 179°59.53’W, 830–1060 m, TAN0604/15, 29 May 2006 ; NIWA 34989 , 1 male (cl 23.7 mm, cw 22.8 mm), 42°45.52–45.60’S, 179°59.61–59.62’W, 925 m, TAN0104/42, 16 Apr 2001 ; NIWA 29372 , 1 female (cw 25.2 mm), 42°45.68’S, 179°59.33’W, 920– 771 m, TAN0104/394, 21 Apr 2001 .

Chatham Rise: NIWA 13887 , 1 male (cl 16.6 mm, cw 15.9 mm), 44°14.50’S, 174°36.60’W, 985–1060 m, Z11072 , bottom temperature 5.1°C , MFISH SOP trip 1643/18, FV Otakau, A. Rapson, 24 Apr 2002 .

Bollon’s Seamount: NIWA 27539 , 1 male (cl 23.6 mm, cw 23.6 mm), 1 female (24.3 mm, cw 24.0 mm), 49°48.63’S, 175°19.30’E, 908– 887 m, TAN0307/79, 2 May 2003 .

Tasmania, Australia: NMV J41285 , 4 males (cl 15.1–28.6 mm, cw 14.0– 27.1 mm), 6 females (cl 18.3– 25.7 mm, cw 17.8–25.7 mm; smallest ovigerous), J1 Seamount , 84 km SSE of Southeast Cape, 44°16.2’S, 147°19.8’E, 1300 m, epibenthic sled, SS01/97 37 , T. Stranks et al., 27 Jan 1997 ; NMV J41288 , 3 males (cl 24.7–28.9 mm, cw 23.2–28.6 mm), 7 females (cl 12.0– 19.8 mm, cw 11.3–19.0 mm), V Seamount , 94.5 km SSE of Southeast Cape , 44°24.0’S, 147°09.0’E, 1400 m, sled , T. Stranks et al., 31 Jan 1997 .

Diagnosis. Carapace subcircular, as long as or slightly longer than wide (excluding spines); covered by long black-brown setae and short velvety tomentum; regions with small, well-spaced granules or short spinules, not usually protruding through tomentum. Carapace frontal width basally about 3 times length; sinuses separating lobes almost reaching to frontal base; frontal lobes marginally granular or spinulate; median lobe apically rounded, broader and slightly longer than lateral lobes; lateral lobes pointed. Anterolateral margins with 4 (including outerorbital) short, prominent, evenly spaced, secondarily spinous conical spines. Posterolateral margins without prominent spines, with acute tubercle or small spine near midlength and occasionally another near anterior quarter. Antennal segments unarmed, peduncle not extending beyond median rostral tooth. Right (major) cheliped of adult males massive; palm with scattered setae and small sparsely distributed spinules on upper margin and upper third of outer surface; surfaces otherwise smooth, glabrous. Ambulatory legs with few scattered granules or short spines on merus, carpus and propodus.

Description. Carapace subcircular, as long as or slightly longer than wide (excluding spines), moderately arched longitudinally, slightly arched transversely. Dorsal surface covered by long black-brown setae and short velvety tomentum (loaded with sediment, usually mud, in fresh specimens); regions indicated and bearing small, well-spaced granules or short spinules, not usually protruding through tomentum; granules and spinules on anterior half of carapace generally more prominent than on posterior half. Branchiocardiac grooves deep, arcuate. Front trilobate, lobes short, anteriorly directed; frontal width basally about 3 times length; sinuses separating lobes reaching almost to frontal base; margins of lobes with granules or small spines; median lobe apically rounded, as long as or slightly longer than broad, margins subparallel, broader and slightly longer than lateral lobes; lateral lobes triangular, pointed. Orbits transverse. Eyestalk with 1 or 2 anterior spinules. Inner and outerorbital teeth triangular, margins with acute granules or small spines. Supraorbital margin with triangular, marginally spinulate tooth. Suborbital margin with rounded or acute granules, mesial margin produced to a spinulose triangular lobe. Pterygostomial regions smooth to finely granular, setose. Anterolateral margin convex, with 4 short, prominent, evenly spaced, secondarily spinous conical spines (including outer orbital), apices directed anterolaterally; margins lined with granules and short spines. Posterolateral margins broadly convex; without prominent spines but with acute tubercle or small spine near midlength and occasionally another near anterior quarter (both slightly larger than adjacent granules or spinules). Posterior margin granular, broadly convex, occasionally slightly emarginate medially.

Sternum ovoid, widest at sternite 5 (= sternite of P2); surface with stiff setae and velvety tomentum, punctate, with low scattered granules. Sternites 2 and 3 well demarcated. Sternites 3 and 4 fused. Press-button of abdominal locking mechanism in males positioned near posterior margin of sternite 5. Female gonopore on sternite 6; orifice simple. Anterior end of sternoabdominal cavity reaching anterior half of sternite 4. Sutures 4/5 and 5/6 medially interrupted. Suture 6/7 and 7/8 complete. Sternites 7 and 8 with median groove.

Antennular basal segment with granular mesial margin, otherwise unarmed. Antennal segments unarmed, peduncle not extending beyond median rostral tooth, flagellum as long as or shorter than peduncle.

Third maxilliped setose; merus minutely and sparsely granular, subpentagonal, anteroexternal angle rounded, margin granular, inner proximal margin with 1 or 2 spines; ischium subrectangular, with submedian sulcus; exopod stout, apex blunt, reaching to distal edge of merus.

Right (major) cheliped of adult males stout, massive; chela 1.1 cl in largest specimen. Merus trigonal, length less than 1.5 times width across articulation with carpus; setose dorsally; sparsely granular. Carpus setose; with scattered, prominent granules or spinules; mesial margin with triangular, spinulose tooth. Palm height subequal to length of dorsal margin; with scattered setae and small sparsely distributed spinules on upper margin and upper third of outer surface; surfaces otherwise smooth, glabrous. Pollex with longitudinal groove on lateral and mesial surfaces, otherwise smooth, glabrous. Dactylus as long as pollex and almost as long as dorsal margin of palm; surface finely granular, glabrous; lateral and mesial surfaces with broad longitudinal sulcus. Both fingers dark brown; occlusal margins with 4 or 5 low, blunt teeth.

Left (minor) cheliped of male slender; chela 0.6 cl in largest specimen. Merus length about twice width across articulation with carpus; surfaces setose; distal dorsal margins with granules or short spines. Carpus setose; with scattered granules or short spines; mesial margin with triangular, spinulose tooth. Palm height subequal to length of dorsal margin; with dense setae and short, sparsely distributed spines on upper margin and outer surfaces. Pollex and dactylus subequal; surfaces densely setose, without longitudinal sulci; fingers darkened in distal third; occlusal margins with 4–6 low, blunt brown teeth.

Both chelipeds of female similar to that of left male cheliped; chela 0.5 cl at all sizes.

Ambulatory legs similar, relative lengths P4>P3>P2>P5; P4 1.4–1.6 cl, increasing with size and slightly longer in males than females (up to 1.6 cl in males; up to 1.5 cl in females); surfaces covered with long, brown setae and short, velvety tomentum; dactyli also densely covered with short, coarse setae. Merus ovate in crosssection; dorsal margin with few scattered granules and 1 or 2 short spines distally. Carpus about 0.6 merus length, sparsely spinulate. Propodus about as long as carpus, unarmed or with scattered granules or spinules along dorsal margin. Dactylus about 1.5 times propodus length, apex corneous.

Abdomen with 6 free somites and telson in both sexes; surface setose, without tubercles or granules. Male abdomen widest at somite 3; somites 4 and 5 subequal, subrectangular, margins slightly convergent; somite 6 longer than somites 4 and 5, margins subparallel, distolateral angles slightly swollen; telson triangular, wider than long, apex rounded. G1 thick, relatively straight, as illustrated. G2 styliform, sinuous, apex spiniform; longer than G1. Female abdomen ovoid, widest at somite 5; telson wider than long, apex rounded.

Etymology. Named for Janet Grieve, fellow carcinologist, for her contributions to New Zealand marine science.

Remarks. Of the known extant species of Trichopeltarion A. Milne-Edwards, 1880 , T. janetae most closely resembles T. pezzutoi Tavares & Melo, 2005 ( Brazil) and T. nobile A. Milne-Edwards, 1880 ) (Gulf of Mexico and Caribbean Sea) in the combination of the subcircular carapace, similarly sized anterolateral spines, simple rather than compound dorsal carapace spinules or granules, and a frontal carapace region that is not strongly produced anteriorly such that the bases of the frontal lobes are more or less in line with the general carapace outline. Trichopeltarion janetae differs from both T. pezzutoi and T. nobile in spinous rather than unarmed margins of the frontal lobes and a median frontal lobe that is apically rounded and linguiform, rather than acutely triangular ( Fig. 7B , 9C ). Moreover, T. janetae (to 32.4 mm cl) attains a smaller size than either T. pezzutoi or T. nobile , both of which exceed 80 mm cl ( Tavares & Melo 2005). Trichopeltarion janetae perhaps most closely resembles the extinct T. greggi Dell, 1969 , from the middle–late Miocene of New Zealand sharing similar carapace shape and ornamentation including equally sized, secondarily spinous anterolateral spines and sparsely distributed, simple dorsal granules or spinules. Like T. pezzutoi and T. nobile , however, T. greggi is a much larger species (up to 91.2 mm cl) with an apically pointed rather than apically rounded median frontal lobe, and unarmed rather than spinous margins of the frontal lobes.

Trichopeltarion janetae is the second extant species of the genus known from New Zealand. A third species, T. wardi Dell, 1968b , is known from southeastern Australia. The new species is readily distinguished from its New Zealand congener, T. fantasticum Richardson & Dell, 1964 ( Fig. 5D ), by its much smaller adult size (up to 28.0 mm cl versus 74.0 mm cl [male, Bay of Plenty, NIWA 16547]), densely setose rather than sparsely setose carapace, and most readily by the length of the last anterolateral spine — subequal to the preceding tooth in T. janetae ; considerably longer than the other anterolateral teeth in T. fantasticum ( Fig. 5A , 7B , 9C , 28C ). Owing to the dense overall setation, freshly collected specimens of T. janetae are invariably covered in sediment that obscures most of the surface ornamentation ( Figs 10A , 28D ). Consequently, in the field, even small specimens of T. fantasticum are readily distinguished from T. janetae by the relatively clean versus ‘dirty’ carapace. Trichopeltarion wardi is similar to T. janetae in its small size (to 26 mm cl) and similarly sized anterolateral carapace spines, but is readily distinguished by having compound instead of simple dorsal carapace granules and tubercles, and in similarly sized and unarmed rostral lobes (in contrast to median lobe broader than laterals, each with marginal spinules).

As in most species of Trichopeltarion , male T. janetae exhibit considerable sexual dimorphism in the development of the right cheliped. Juvenile males, like females, have small, equally-sized chelipeds with the chela about 0.5 cl. Males have well-developed gonopods by about 12 mm cl, and cheliped dimorphism is apparent by about 19 mm cl in which the right cheliped is slightly larger than the left (chela 0.5 versus 0.7 cl) and the lower distal half of the cheliped palm lacks setae. By about 22 mm cl, the right cheliped is prominently enlarged (chela 0.8 cl) and is glabrous on the outer surface. By about 28 mm cl, the right cheliped is massively enlarged with the major chela 1.1 cl and minor chela 0.6 cl. A male from Gothic Seamount (NIWA 34980), a female from Morgue Seamount (NIWA 34981) and a male from Moa cold seep (NIWA 32005) were infected by rhizocephala.

Juvenile females up to about 12 mm cl have a narrow abdomen and functional press-button for the abdominal locking mechanism. By 14–15 mm cl, the press-button is lost and the abdomen is slightly broader, but the gonopores are rudimentary. Females exceeding about 17 mm cl appear to be mature with well-developed gonopores and a broad abdomen. The smallest ovigerous female measures 17.3 mm cl, 16.7 mm cw (NIWA 27558).

The degree of carapace granulation or spinulation in T. janetae is somewhat variable. Most specimens have sparsely distributed carapace granules or spinules ( Figs 4–6 ), few of which protrude through the tomentum. On the posterior half of the carapace, the tubercles and spinules are generally lower than on the anterior half, and are occasionally indistinct on the cardiac, intestinal and posteromesial branchial regions. Two large females, one from Graveyard Seamount (NIWA 29643), and one from Morgue Seamount (NIWA 29369) have more prominent and more elongate tubercles or spinules on the carapace that protrude through the dorsal tomentum ( Fig. 10B ), with similarly elongate spinules on the chelipeds and ambulatory meri. The specimens appear to represent an extreme in variation.

Trichopeltarion sp. , reported by Poore (2004: fig. 123b, pl. 22a) from seamounts off Tasmania, Australia, is referable to T. janetae . The specimens from Tasmania agree well in all respects with New Zealand material.

Distribution. Eastern New Zealand, from seamounts in the Bay of Plenty south to the Chatham Rise and Bollons Seamount at 830–1506 m, and from seamounts off Tasmania, Australia, at 900–1700 m ( Poore 2004).

Figures

FIGURE 4. Dicranodromia delli sp. nov., ovigerous female holotype, cl 19.0 mm, cw 15.5 mm (NIWA 18049). A, anterior, dorsal view. B, anterior, ventral view. C, left third maxilliped. D, left P5 dactylus and propodus. Scale: A–C = 2.0 mm, D = 1.0 mm.

FIGURE 5. A, Trichopeltarion fantasticum Richardson & Dell, 1964, male, cl 58.1 mm (NIWA 16492). B, Ovalipes molleri (Ward, 1933), male, cl 75.6 mm (NMNZ Cr7223). C, Gandalfus puia McLay, 2007, male holotype, cl 15.5 mm, cw 24.3 mm (NIWA 27855). D, Miersiograpsus australiensis Türkay, 1978, male, cl 11.4 mm, cw 11.8 mm (NIWA 29390). E, Xenograpsus ngatama McLay, 2007, male, cl 25.9 mm, cw 27.4 mm (NIWA 27854). F, Miersiella haswelli (Miers, 1886), male, cl 7.8 mm (NIWA 6760). C, E, after McLay (2007)

FIGURE 6. Cymonomus clarki sp. nov., ovigerous female holotype, cl 6.9 mm, cw 6.6 mm (NIWA 29666). A, dorsal habitus. B, frontal region. C, left third maxilliped. D, distal abdominal somites. Scale: A, D = 2.0 mm, B–C = 1.0 mm.

FIGURE 7. Trichopeltarion janetae sp. nov., male holotype, cl 28.0 mm, cw 26.3 mm (NIWA 29655). A, dorsal habitus. B, carapace, dorsal view. Carapace setae removed.

FIGURE 8. Trichopeltarion janetae sp. nov., male holotype, cl 28.0 mm, cw 26.3 mm (NIWA 29655). A, third maxilliped and ventral anterior. B, abdomen. C, right chela. D, right cheliped carpus. E, left chela. F, left cheliped carpus.

FIGURE 9. Trichopeltarion janetae sp. nov. A, anterior of male holotype, cl 28.0 mm, cw 26.3 mm (NIWA 29655). B– D, female paratype, cl 26.5 mm, cw 25.3 mm (NIWA 34982). B, dorsal habitus. C, carapace, dorsal view. D, sternum. E, abdomen. Carapace setae removed.

FIGURE 10. Trichopeltarion janetae sp. nov. A, male paratype, cl 27.9 mm, cw 27.3 mm (NIWA 29650). B, female, cl 27.8 mm, cw 26.8 mm, Graveyard Seamount (NIWA 29643).

FIGURE 11. Trichopeltarion janetae sp. nov., male holotype, cl 28.0 mm, cw 26.3 mm (NIWA 29655). A, right P5. B, right G2, abdominal view. C, right G1, abdominal view. Scale: A = 5.0 mm, B–C = 2.0 mm.

FIGURE 28. A–B, Ethusina castro sp. nov., ovigerous female holotype, cl 14.1 mm (NIWA 6067), dorsal and ventral views. C, Trichopeltarion fantasticum Richardson & Dell, 1964, female, cl 53.1 mm (NIWA 6754). D, Trichopeltarion janetae sp. nov., male, cl 27.9 mm (NIWA 29650). E, Chaceon yaldwyni Manning, Dawson & Webber, 1990, 1 male, cl 55.2 mm (NIWA 6716). F, Lyreidus tridentatus De Haan, 1841, male, cl 38.5 mm (NIWA 6720). Photo credits: R. Stewart (A–C, E–F), C. Marriot (D).