Pycnoplax, Castro, 2007

Castro, Peter, 2007, A reappraisal of the family Goneplacidae MacLeay, 1838 (Crustacea, Decapoda, Brachyura) and revision of the subfamily Goneplacinae, with the description of 10 new genera and 18 new species, Zoosystema 29 (4), pp. 609-774 : 662-663

KEY TO SPECIES OF PYCNOPLAX N. GEN.

1. Two acute, thin, spine-like anterolateral teeth (see Fig. 13B ) .......... Pycnoplax bispinosa

— Two triangular anterolateral teeth which may have acute tips but never thin, spine-like ................................................................................................................................... 2

2. Ambulatory legs (P2-P5) long, relatively slender, distal end of merus of folded P5 extending beyond tip of second anterolateral tooth (see Fig. 13A ). G2 with pointed tip without terminal spinules (see Guinot 1969a: fig. 74; 1989: fig. 31B; Chen 1984: figs 3-7, 3-8, as Carcinoplax surugensis ) ............................................................... Pycnoplax surugensis

— Ambulatory legs (P2-P5) relatively short, distal end of merus of folded P5 only reaching or barely reaching tip of second anterolateral tooth. G2 with terminal spinules (see Fig. 16D ) ................................................................................................................................... 3

3. Leaf-like, granular, shallow tooth on each outer orbital angle (see Figs 16A ; 17 ). Short tooth on each suborbital border .............................................. Pycnoplax latifolia n. sp.

— Triangular, pointed tooth on each outer orbital angle. Conspicuous tooth on each suborbital border ........................................................................................................................ 4

4. Second anterolateral tooth curved, hook-like, acute tip (see Poore 2004: fig. 140c). Dorsal surface of carapace relatively smooth ......................................... Pycnoplax meridionalis

— Second anterolateral tooth triangular, obtuse tip (see Poore 2004: fig. 140d). Two shallow horizontal ridges on dorsal surface of carapace .............................. Pycnoplax victoriensis

Figures

FIG. 13. — A, Pycnoplax surugensis (Rathbun,1932) n. comb., ♂, cl 14.7 mm, cw 20.6 mm,off southern coast of New Caledonia,BATHUS 2, stn DW 719,22°47.57’S,167°14.58’E,444-455 m (MNHN-B 29412);B, Pycnoplax bispinosa (Rathbun, 1914) n. comb., ♀, cl 9.0 mm, cw 11.2 mm,off Rendova I., SALOMON 2,stn CP 2287,253-255 m (MNHN-B 30088);C, Thyraplax crosnieri (Guinot & Richer de Forges, 1981) n. comb., ♀, cl 10.6 mm, cw 13.5 mm, off southern coast of New Caledonia, MUSORSTOM 4, stn DW 222, 410-440 m (MNHN-B 29422).

FIG. 16. — Pycnoplax latifolia n. sp.,♂ holotype,cl 6.2 mm,cw 7.8 mm,Izu Is, Japan,Shinnyo-maru, cruise SY96,275-350 m (CBM-ZC 4624): A, dorsal surface of the carapace; B, abdomen; C, left G1, dorsal view; D, left G2, ventral view. Scale bars: A, 5 mm; B, 3 mm; C, D, 1 mm.

FIG. 17. — Pycnoplax latifolia n. sp.,♂ holotype,cl 6.2 mm,cw 7.8 mm,Izu Is, Japan,Shinnyo-maru, cruise SY96,275-350 m (CBM-ZC 4624).