Camatopsis leptomerus n. sp.

(Figs. 8 A‒F; 23D, E; 30C; 39A‒D; 51C; 58C; 67J‒L; 68; 86C; 90C; 100E‒G)

Camatopsis rubida Forma B—Tesch 1918: 235 (part), pl. 16, fig. 3e‒i [Indonesia]. [Other Forma B specimens = Camatopsis minor n. sp. and Microtopsis teschi n. sp.].

? Camatopsis rubidus [sic] Serène & Vadon 1981: 118, 119, 120, 123 [Philippines].

Type material. Holotype male (10.5 × 11.3 mm) (NMCR), Bohol Sea, Philippines, PANGLAO 2005, stn CP2390, 09°27'N, 123°43'E, 627–645 m, 30.05.2005.

Paratypes: 2 males (ZRC 2015.216), PANGLAO 2005: off Balicasag I., stn CP2336, 09°32.3’N, 123°39.3’E, 757–760 m, 22.05.2005; 1 ovigerous female (ZRC 2015.123) [photographed], DW2371, Bohol / Sulu seas, Dipolog Bay, 08°35’N, 123°16'E, 172–175 m, 24.05.2005 ; 1 male (7.8 × 8.1 mm with sacculinids) (ZRC 2015.146), stn CP2655, 16°02.8’N–16°03.03’N to 121°53.7’E–121°52.51’E, 189 m, 20.05.2007; 1 female (ZRC 2015.154) [photographed], stn CP2655, 16°03’N, 121°54’E, 189 m, 20.05.2007; 1 female with sacculinid (ZRC 2015.150) [photographed], stn CP2657, 16°01’N, 121°53’E, 342–358 m, 20.05.2007; 2 males (ZRC 2015.183) [G1 drawn], stn 2762, 15°52.45’N–15°51.72’N to 121°37.22’E–121°51.72’E, 66 m, 04.06.2007; 1 male (ZRC 2015.148), stn CP2665, 15°53’N, 121°42’E, 123–125 m, 21.05.2007; 1 male, 4 females (MNHN-IU-2014-12797, ex ZRC 2015.171), stn CP2666, 15°57’N, 121°44’E, 198–199 m, 21.05.2007; 1 male (ZRC 2015.156), stn CP2667, 15° 56’N, 121°47’E, 292–307 m, 21.05.2007; 1 female (ZRC 2015.149), stn DW2676, 15°04’N, 121°41’E, 313–323 m, 22.05.2007; 1 female (ZRC 2015.157) [photographed], stn CP2708, 15°07’N, 121°38’E, 307–309 m, 28.05.2007; 3 females (1 ovigerous 4.0 × 4.7 mm) (ZRC 2015.155), stn CP2709, 15°11’N, 121°35’E, 244–296 m, 28.05.2007; 1 female (10.4 × 11.1 mm) (ZRC 2015.142), stn CP2711, 15°19’N, 121°32’E, 184–200 m, 28.05.2007; 1 female (12.7 × 13.2 mm) (ZRC 2015.170) [photographed], stn CP2715, 14°33’N, 121°42'E, 274– 249 m, 29.05.2007; 1 male, 1 female (ZRC 2015.147), stn CP2724, 15°11.66’N–15°13.75’N to 121°34.52’E– 121°33.56’E, 229–280 m, 31.05.2007; 1 ovigerous female (9.0 × 10.1 mm) (ZRC 2015.145), stn CP2727, 15°19’N, 121°34'E, 300–318 m, 31.05.2007; 1 female (3.4 × 4.0 mm) (ZRC 2015.159), Eastern Luzon, Baler Bay, Casiguran Sound, stn DW2739, 16°05’N, 121°57’E, 96 m, 1.06.2007 ; 1 female (ZRC 2015.151), stn CP2742, 16°03’N, 121°52'E, 182–205 m, 01.06.2007; 1 male, 1 female (MNHN-IU-2014-12798, ex ZRC 2015.152), stn CC2743, 16°01’N–16°00.75’N to 121°51.06’E–121°49.94’E, 302–309 m, 02.06.2007; 4 females (8.1 × 8.5 mm, 8.7 × 9.4 mm, 9.0 × 9.8 mm, 9.3 × 10.2 mm) (ZRC 2015.160), stn CC2746, 15°58.78’N–15°56.63’N to 121°46.44'E–121°44.85’E, 182–220 m, 02.06.2007; 3 females (ZRC 2015.176), stn CP2748, 15°56’N, 121°46'E, 230–248 m, 02.06.2007; 1 male, 1 female (ZRC 2015.144), stn CP2761, 15°53.2’N, 121°53.2'E, 79 m, 04.06.2007; 1 female (ZRC 2015.153), stn CP2763, 15°51’N, 121°51'E, 30 m, 0 4.06.2007.

Other material examined. Philippines. RV Hakuho-maru: 4 females (CBM-ZC 8771), Sulu Sea, stn SA-2, 10°36.48’N, 121°31.56'E, 362–372 m, S. Ohtsuka coll., 08.12.2002 .— PANGLAO 2004: 1 female (ZRC 2015.169), Cortes I., Bohol, stn D10, 09°42.4’N, 123°50.6’E, 15–22 m, 20.06.2004; 1 crushed specimen (ZRC 2015.126) [photographed], Cortes I., Bohol, stn D10, 09°42.4’N, 123°50.6’E, 15–22 m, 20.06.2004; 1 male ZRC 2015.129) [photographed], Bohol I., Cortes, stn T15, 09°41.2’N, 123°49.0’E, 180 m, 24.06.2004 ; 1 female (ZRC 2015.141), Bohol I., Cortes, stn T19, 09°42.2’N, 123°50.8’E, 10–26 m, 20.06.2004 ; 1 juvenile, 2 males (3.1 × 3.4 mm, 4.7 × 5.9 mm), 4 females (smallest 4.6 × 5.4 mm) (ZRC 2015.120), Bohol I., Cortes, stn T25, 09°41.1’N, 123°49.3'E, 160–210 m, 24.06.2004 .—PANGLAO 2005: 2 males, 1 female (ZRC 2015.135), Bohol Sea, Maribojoc Bay, stn CP2332, 09°39’N, 123°46'E, 396–418 m, 22.05.2005 ; 2 males, 4 females (ZRC 2015.127), Bohol Sea, Maribojoc Bay, stn CP2333, 09°38’N, 123°44'E, 584–596 m, 22.05.2005 ; 1 male, 1 female (ZRC 2015.137), Bohol Sea, Maribojoc Bay, stn CP2334, 09°38’N, 123°40'E, 606–631 m, 22.05.2005 ; 1 female (ZRC 2015.130), Bohol Sea, stn CP2335, 09°34’N, 123°38'E, 729–733 m, 22.05.2005; 1 male (ZRC 2015.179), off Balicasag I., Bohol, stn CP2339, 09°31.9’N, 123°43.7’E, 164–176 m, 23.05.2005; 2 males, 1 female (ZRC 2015.125), Bohol Sea, off Balicasag I., stn CP2340, 09°29’N, 123°44'E, 271–318 m, 27.05.2005; 1 male, 1 juvenile female, 1 female (ZRC 2015.121), Bohol Sea, off Pamilacan I., stn CP2343, 09°27’N, 123°49'E, 273–356 m, 23.05.2005; 2 females (ZRC 2015.134), Bohol Sea, off Pamilacan I., stn CP2348, 09°30’N, 123°52'E, 196–216 m, 24.05.2005; 2 females (ZRC 2015.140), Bohol Sea, off Pamilacan I., stn CP2349, 09°32’N, 123°56'E, 219–240 m, 24.05.2005; 2 females (larger 12.4 × 12.8 mm) (ZRC 2015.131), Bohol Sea, stn CP2350, 09°31’N, 124°01'E, 602–738 m, 24.05.2005; 2 males (ZRC 2015.162), Bohol Sea, stn CP2352, 09°27’N, 124°03'E, 923–1260 m, 24.05.2005; 1 male, 1 female, Bohol / Sulu seas, Dipolog Bay, stn DW2371, 08°35’N, 123°16'E, 172–175 m, 24.05.2005 ; 1 male, 1 female (ZRC 2015.128), Bohol / Sulu seas, Dipolog Bay, stn CP2372, 08°39’N, 123°16'E, 255–301 m, 27.05.2005 ; 1 female (ZRC 2015.124), Bohol / Sulu seas, Dipolog Bay, stn CP2379, 08°39’N, 123°16'E, 255–301 m, 28.05.2005 ; 2 males, 2 females (ZRC 2015.132), Bohol / Sulu seas, Dipolog Bay, stn CP2381, 08°43’N, 123°19'E, 259–280 m, 28.05.2005 ; 1 male (6.0 × 6.8 mm), 1 female (6.6 × 7.7 mm) (ZRC 2015.139), Bohol / Sulu seas, off Aligbay I., stn CP2383, 08°45’N, 123°18'E, 338–351 m, 29.05.2005; 4 males, 2 females (MNHN-IU-2014-12796, ex ZRC 2015.158), Bohol Sea, stn CP2388, 09°27’N, 123°34'E, 762–786 m, 30.05.2005; 1 male, 5 females (ZRC 2015.163), Bohol Sea, stn CP2389, 09°28’N, 123°38'E, 784–786 m, 30.05.2005; 6 males, 10 females (smallest 8.7 × 10.1 mm) (ZRC 2015.133), stn CP2390, 09°27’N, 123°43'E, 627– 645 m, 30.05.2005; 2 females (ZRC 2015.182), stn CP2390, 09°27’N, 123°43'E, 627–645 m, 30.05.2005; 1 female (ZRC 2015.177), Bohol Sea, off Balicasag I., stn CP2394, 09°29’N, 123°40'E, 470–566 m, 30.05.2005; 3 females (ZRC 2015.136), Bohol Sea, Maribojoc Bay, stn CP2396, 09°36’N, 123°42'E, 609–673 m, 31.05.2005 ; 1 male, 3 females (ZRC 2015.167), Bohol Sea, Maribojoc Bay, stn CP2397, 09°35’N, 123°42'E, 642–669 m, 31.05.2005 ; 1 male (ZRC 2015.181), Bohol Sea, off Balicasag I., stn CP2398, 09°33’N, 123°40'E, 713–731 m, 31.05.2005; 1 female (ZRC 2015.122), Bohol Sea, Maribojoc Bay, stn CP2404, 09°39’N, 123°43'E, 481–505 m, 1.06.2005 ; 1 female (ZRC 2015.138), Bohol Sea, Maribojoc Bay, stn CP2405, 09°39’N, 123°46'E, 387–453 m, 1.06.2005 ; 1 male, 3 females (ZRC 2015.143), Bohol Sea, Maribojoc Bay, stn CP2407, 09°41’N, 123°48'E, 256–268 m, 1.06.2005.

Taiwan. Nanhai 2014 Expedition: 1 male (7.4 × 8.0 mm) (ZRC 2014.0226), stn CP4009, muddy bottom, off Small Liu Qiu I., 22°12.9942’N –22°12.9631’N to 120°25.9553’E– 120°24.1897’E, 310–346 m, northernmost Taiwan, near Philippines, 1.12.2013.

Malaysia. 1 female (4.4 × 4.6 mm) (ZRC 2014.00222), stn F28, oilfield, offshore Bintulu, northern Sarawak, deep water, T.S. Leong coll., 2000s.

Indonesia. Ambon. SIBOGA EXPEDITION: 1 male (2.5 × 3.9 mm) (NNM-ZMA 241605e), near Rotti, stn 302, 10°27.9’S, 123°28.7’E, 216 m, 07.1899; 1 male (4.2 × 5.0 mm) (NNM-ZMA 241605c), stn 312, Saleh Bay, north coast of Sumbawa, 274 m, 0 7.1899.

Papua New Guinea. BIOPAPUA: 1 female (MNHN-IU-2013-7162), Tami I., Huon Gulf, stn DW3644, 06°46’S, 147°50’E, 360-406 m, 24.08.2010; 1 male, 2 females (MNHN-IU-2011-1528), Open Bay, stn CP3665, 04°50’S, 151°38’E, 225–340 m, 23.10.2010 ; 1 female (MNHN-IU- 2011-2421), off Sepik River, stn CP3702, 03°57’S, 144°40’E, 80–91 m, 01.10.2010; 1 male, 4 females (1 crushed) (ZRC 2015.263, MNHN-IU- 2011-2176), Astrolabe Bay, stn CP3710, 05°22’S, 145°48’E, 372–384 m, 05.10.2010 ; 1 male, 1 female (ZRC 2015.246, ex MNHN-IU- 2011-2044), Astrolabe Bay, stn CP3711, 05°23’S, 145°48’E, 434–447 m, 05.10.2010 .— PAPUA NIUGINI: 1 male, 1 female (MNHN-IU-2013-9009), west Kranket I., stn CP3949, 05°12’S, 145°51’E, 380–407 m, 26.11.2012 .

Vanuatu. MUSORSTOM 8: 1 male (MNHN-IU-2013-9047), stn DW1003, 18°49’S, 168°59'E, 200–327 m, 25.09.1994; 1 male (MNHN-IU-2014-12799), stn DW1069, 15°33’S, 167°14'E, 122–125 m, 04.10.1994; 1 female (MNHN-IU-2014-12800), stn DW1115, 15°10’S, 166°53'E, 147–150 m, 09.10.1994.— SANTO 2006: 1 juvenile (ZRC 2015.161), northwest of Malo I., stn AT6, 15°38.2’S, 167°02.2'E, 140–167 m, 15.09.2006 ; 1 female (7.2 × 7.9 mm) (ZRC 2015.173) [photographed], W. Malo I., stn AT18, 15°41’S, 167°03'E, 321–336 m, 21.09.2006; 1 female (ZRC 2015.178), W. Malo I., stn AT18, 15°41’S, 167°03'E, 321–336 m, 21.09.2006; 1 female (9.5 × 10.1 mm) (ZRC 2015.168) [photographed], N. Urélapa I., stn AT29, 15°35.9’S–15°36.0'S to 167°01.3/01.6'E, 83–90 m, 25.09.2006; 1 male (5.1 × 5.6 mm) (ZRC 2015.184), N. Urélapa I., stn AT29, 15°35.9'S–15°36.0’S to 167°01.3/ 01.6'E, 83–90 m, 25.09.2006; 1 female (ZRC 2015.172), N. Urélapa I, stn AT43, 15°36’S, 167°02'E, 84–105 m, 29.09.2006; 1 male, 1 female (MNHN-IU-2014-12801, ex ZRC 2015.174), N. Urélapa I., AT44, 15°36’S, 167°03'E, 86–118 m, 29.09.2006; 1 female (ZRC 2015.175), Bigbay, stn AT98, 15°07’S, 166°51'E, 347–394 m, 14.10.2006; 1 female (ZRC 2015.180), W. Malo I., stn AT121, 15°39’S, 167°01'E, 275–290 m, 19.10.2006.

New Caledonia. BATHUS 1: 1 female (MNHN-IU-2013-9461), stn DW664, 20°57.34’S, 165°36.70’E, 650– 700 m, 13.03.1993; 1 juvenile male, 1 female (MNHN-IU-2013-9458), stn DW706, 21°42.13’S, 166°34.21’E, 247–252 m, 19.03.1993.—BATHUS 4: 1 male, 2 females (MNHN-IU-2013-9465), stn DW882, 22°02.43’S, 165°56.42’E, 250–350 m, 01.08.1994.— EXBODI: 3 females (MNHN-IU-2011-8837), Thio, stn DW3794, 21°33’S, 166°22'E, 224–285 m, 04.09.2011 ; 5 males, 5 females (MNHN-IU-2011-7691), 1 male, 5 females (MNHN-IU-2011-8795), Thio, stn CP3795, 21°32’S, 166°21’E, 240–245 m, 04.09.2011 ; 1 male (MNHN-IU- 2011-6735), stn DW3797, 21°31’S, 166°19’E, 456 m, 04.09.2011; 1 male (MNHN-IU-2011-7282), Thio,stn DW3798, 21°32’S, 166°21'E, 478–480 m, 04.09.2011 ; 1 female (MNHN-IU-2013-9006), 1 male (MNHN-IU- 2013-9008), Thio, stn CP3800, 21°32’S, 166°22'E, 279–282 m, 04.09.2011 ; 2 females (MNHN-IU-2011-7417), Toupeti, stn DW3804, 21°43’S, 166°35'E, 280 m, 05.09.2011 ; 3 males, 3 females (MNHN-IU-2011-6985), Solitaire Pass, stn DW3812, 21°46’S, 166°39’E, 235–240 m, 06.09.2011 ; 2 females (MNHN-IU-2011-8874), 2 females (MNHN-IU-2011-8266), 1 male, 1 female (MNHN-IU-2011-8110), 1 male, 3 females (MNHN-IU-2011- 7445), Solitaire Pass, stn CP3813, 21°46’S, 166°38'E, 251–281 m, 06.09.2011 ; 3 females (MNHN-IU-2011-7284), Kouakoue Canyon, stn DW3820, 21°53’S, 166°50’E, 250–337 m, 07.09.2011 ; 1 male, 2 females (MNHN-IU- 2011-7728), Kouakoué Canyon, stn CP3821, 21°53’S, 166°50’E, 211–440m, 07.09.2011 ; 4 males (MNHN-IU- 2011-8737), Pass at Ounia, stn CP3823, 21°55’S, 166°55’E, 246–255 m, 07.09.2011 ; 1 male, 6 females (MNHN- IU-2013-9004), Pass at Ounia, stn CP3827, 21°58’S, 166°57’E, 220–232 m, 08.09.2011 ; 5 males, 8 females (MNHN-IU-2011-8346), 10 males, 12 females (MNHN-IU-2011-6741), Pass at Ounia, stn CP3827, 21°58’S, 166°57’E, 220–232 m, 08.09.2011 ; 1 male (MNHN-IU-2011-7858), Pass at Ouénou, stn CP3828, 22°00’S, 167°01’E, 200–302 m, 0 8.09.2011.

Diagnosis. Carapace (Figs. 8 A‒F; 100E–G) subtrapezoidal, 1.0‒1.2 wider than long; front bilobed, with shallow to sometimes deep median cleft; anterolateral margins arcuate, minutely granular with granules higher along lateral margins, without distinct lobes or teeth. Eye peduncle (Fig. 23 D, E) filling orbit, short, slightly mobile; cornea reduced, with reduced pigmentation. Epistome (Fig. 23 D, E) with wide, semicircular median lobe with deep median fissure, semicircular lateral margins. Third maxilliped (Fig. 30 C) merus subcircular, ischium subquadrate, about same length as merus. Proportionally long, slender ambulatory legs (Figs. 8 A‒F; 100E); P5 merus 0.7 cl in holotype male, 0.6 in paratype female. Chelipeds (Figs. 8 A‒F; 39A‒D; 100E–G) subequal in length, slightly dissimilar in females, heteromorphic in males. Major chela of males (Fig. 39 A) with thick propodus, cutting margins with wide teeth. Minor chela of both sexes (Fig. 39 B, D) with short teeth of about same size (2 long, sharp teeth that overlap dactylus when closed in holotype male). Inner margin of cheliped carpus smooth. Fused thoracic sternites 1, 2 (Fig. 51 C) triangular, proportionally narrow, short. Male pleon (Figs. 51 C; 58C) with proportionally short telson. G1 (Figs. 67 J, K; 68A‒D) stout, distal segment slightly curved, distal segment curved inwards, upwards, with short to long spinules. G2 (Fig. 67 L) about 3/4 G1 length, straight, slender, distal segment short, straight. Female pleon (Fig. 86 C) with lateral margins of somites strongly convex; telson proportionally short. Sterno-pleonal cavity of female (Fig. 90 C) moderately deep, vulvae far apart from each other.

Colour. The carapace is brownish white to light brown in life, with the chelipeds white and the ambulatory legs white to light brown (Fig. 100 E‒G).

Etymology. The species epithet, leptomerus, refers to the relatively longer and more slender ambulatory legs of individuals as compared to congeners. The name is used as a noun in apposition.

Remarks. Camatopsis leptomerus n. sp. is easily distinguished from congeners by having the proportionately longest and most slender ambulatory meri (Fig. 8 A‒F). Its G1 is also the straightest, with the distal part twisting gently but distinctly upwards rather than turned to one side (when examined ex situ) (Figs. 67 J, K; 68A‒D). The distal part of the G1 is distinctly bent inwards in congeners. This is evident even in small specimens (see remarks for genus and Camatopsis rubida). Variation in the morphologies of the third maxillipeds and chela are also discussed under the generic remarks.

Camatopsis leptomerus n. sp. is one of the widest ranging species, occurring from Indonesia to New Caledonia and southern Taiwan. It apparently occurs sympatrically with species like C. rubida in Papua New Guinea and Indonesia. In Indonesia, both species were collected from one Siboga station (312) in Saleh Bay on the north coast of Sumbawa.

Serène & Vadon’s (1981: 118, 119, 120, 123) record of “ Camatopsis rubidus ” [sic] from the Philippines requires confirmation but is provisionally referred to C. leptomerus n. sp. given its occurrence in the area.

Distribution. Western Pacific (southern Taiwan to Malaysia, Indonesia, New Caledonia). Depth: 13– 660 m.