Carcinoplax nana Guinot 1989
Creators: name: Castro, Peter
Publisher: name: Zenodo
Year: 2007
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Decapoda
Goneplacidae
Carcinoplax
Carcinoplax nana

description: Carcinoplax nana Guinot, 1989   
 Carcinoplax nana Guinot, 1989: 293, figs 18, 19, pl. 6, figs F-I [Philippine Is].   
 Not Carcinoplax nana – Ho et al. 2004: 661, fig. 6H (= Carcinoplax sp.).   
TYPE MATERIAL. — MUSORSTOM 2, stn 34, ♂ holotype, cl 13.0 mm, cw 15.2 mm (MNHN-B 10136); 2 ♂♂ paratypes (cl 13.8 mm, cw 18.0 mm; cl 8.0 mm, cw 10.5 mm) (MNHN-B 10126); 4 ♂♂ paratypes (cl 20.2 mm, cw 26.4 mm; cl 15.2 mm, cw 19.8 mm; cl 15.3 mm, cw 19.8 mm; cl 11.1 mm, cw 14.5 mm), 2 pre-adult ♂♂ paratypes (cl 11.0 mm, cw 14.0 mm; cl 7.8 mm, cw 10.2 mm), 3 pre-adult ♀♀ paratypes (cl 12.2 mm, cw 16.0 mm; cl 8.8 mm, cw 11.4 mm; cl 7.1 mm, cw 8.8 mm) (MNHN-B 13844).  
TYPE LOCALITY. — Philippine Islands, north of Mindoro, 155- 167 m.  
 MATERIAL EXAMINED. — Taiwan. Southwest Taiwan, Douggang, commercial trawler, 11.VIII.2003, 1 ♀ (MNHN-B 29772). — Koashiung, Tungkang fishing port, H. H. Tan & L. L. Koh coll., 6-9.XII.2001, 1 ♀ (ZRC 2001.0281).   
TAIWAN 2001, stn CP 80, 24°50.9’N, 121°59.4’E, 194-214 m, 8.V.2001, 1 ♀ (MNHN-B 29691).  
TAIWAN 2002, stn CP 159, 22°14.6’N, 120°59.9’E, 208 m, 24.V.2002, 2 ♂♂, 1 ♀ (MNHN-B 29812). — Stn CP 160, 22°13.0’N, 120°28.8’E, 300 m, 24.V.2002, 1 ♀ (MNHN-B 29815). — Stn CH 175, 22°14.6’N, 120°26.4’E, 210 m, 28.V.2002, 2 ♀♀ (MNHN-B 29813). — Stn CH 176, 22°14.8’N, 120°27.1’E, 160 m, 28.V.2002, 2 ♂♂ (MNHN-B 29814).  
 Philippine Islands. South China Sea, MUSORSTOM 2, stn 34, 13°27.9’N, 121°12.0’E, 155-167 m, 24.XI.1980, ♂ holotype (MNHN-B 10136).   
Bohol, Balicasag I., off Panglao I., tangle nets of local fishermen, 50-500 m, 23.XI.2001, 11 ♂♂, 6 ♀♀ (ZRC 2001.0536), 2 ♂♂, 2 ♀♀ (ZRC 2001.031), 1 ♀ (ZRC 2001.0532). — 200-300 m, XII.2002, 4 ♂♂, 8 ♀♀, 1 ovig. ♀ (ZRC 2001.0365), 1 ♀ (ZRC 2001.0364), 8 ♂♂, 14 ♀♀ (ZRC 2002.0656). — XI.2003, 1 ♂, 1 ♀, 1 pre-adult (MNHN-B 29731). — I.2004, 1 ovig. ♀ (ZRC 2004.0774). — II.2004, 1 ♂ (ZRC 2004.0775); 1 ♂, 1 ovig. ♀, 1 pre-adult (ZRC 2004.0776).  
 PANGLAO 2004, stn P4, tangle nets of local fishermen, 8.VI.2004, 1 ♂ (ZRC 2006.0175), 1 ♂, 1 ♀ parasitised by Sacculina (ZRC 2006.0179).   
 Indonesia. Tanimbar Is, KARUBAR, stn CP 65, 09°14’S, 132°27’E, 176- 174 m, 1.XI.1991, 1 ♂, 1 ♀ parasitised by Sacculina (MNHN-B 29388).   
DISTRIBUTION. — Philippine Is (Guinot 1989) and now Taiwan and Indonesia (Tanimbar Is). Depth: 155- 300 m. Specimens were also obtained from tangle nets of local fishermen in the Philippines that obtained material from estimated depths of 50- 500 m.  
COLOUR  
The carapace and chelipeds are ornamented with thin, reticulated, orange lines, a colour pattern that is visible in smaller individuals when the setae of the carapace are removed.  
REMARKS  
 Although the holotype (♂, cl 13.0 mm, cw 15.2 mm, MNHN-B 10136) is small and the name of the species implies a small size, most specimens examined were relatively large (largest specimen examined: ♂, cl 32.9 mm, cw 43.2 mm, ZRC 2001.0536). The carapace, chelipeds (P1), and ambulatory legs (P2-P5) of the smaller specimens (to about cl 20-23 mm) were covered with conspicuous setae in contrast to the larger individuals, which lacked most or all of the setae. Conspicuous setae is also characteristic of C. spinosissima Rathbun, 1914, but C. nana can be distinguished from the latter by the presence of conspicuous but low, blunt tubercles on the dorsal surface of the cheliped propodi (see Guinot 1989: pl. 6, fig. H) (acute tubercles in C. spinosissima, although they may be absent in large individuals; see Chen 1998: fig. 4-2; Hsueh & Huang 2002: fig. 5E), the dark portion of the fingers covers about half the total length of the fingers (dark portion is about one quarter of fingers in C. spinosissima), and the smooth distal portion of the meri of the ambulatory legs (an acute tooth in C. spinosissima; see Chen 1998: fig. 4-2; Hsueh & Huang 2002: fig. 5C).   
 Material identified as C. nana by Ho et al. (2004: 661, fig. 6H) does not belong to this species.The two small male specimens (MMBA; ZRC 2001.2216), which are badly damaged, were examined but could not be identified. They clearly belong to Carcinoplax.
description: Published as part of 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, pp. 609-774 in Zoosystema 29 (4) on pages 638-639, DOI: 10.5281/zenodo.4525564