Chasmocarcinops Alcock, 1900

Ng, Peter K. L. & Castro, Peter, 2016, Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea), Zootaxa 4209 (1), pp. 1-182 : 45-46

publication ID

https://doi.org/ 10.11646/zootaxa.4209.1.1

publication LSID

lsid:zoobank.org:pub:849BAB5C-464A-4B4A-A586-5742411EDC01

DOI

https://doi.org/10.5281/zenodo.5617111

persistent identifier

https://treatment.plazi.org/id/F16BFB33-FF8F-FFD6-FF6A-F972FBA0FC1D

treatment provided by

Plazi

scientific name

Chasmocarcinops Alcock, 1900
status

 

Genus Chasmocarcinops Alcock, 1900 View in CoL

Chasmocarcinops Alcock, 1900: 334 View in CoL .— Tesch 1918: 280.—Balss 1957: 1661.— Serène 1964a: 264; 1968: 92 [in list].—Dai et al. 1986: 365 [in key; incorrectly as Chasmocarcinus View in CoL ], 387.— Dai & Yang 1991: 393 [in key; incorrectly as Chasmocarcinus View in CoL ], 417.—Ng et al. 2008: 76 [in list].— De Grave et al. 2009: 32 [in list].

Type species. Chasmocarcinops gelasimoides Alcock, 1900 (by monotypy, gender feminine).

Diagnosis. Carapace ( Fig. 9 View FIGURE 9 ) subtrapezoidal, high; front bilobed, with deep median cleft; anterolateral margins arcuate, with conspicuous granules particularly on anterior, posterior margins; long setae; deep, wide sulcus along each mesogastric, cardiac regions. Epistome ( Fig. 23 View FIGURE 23 I, J) sunken, narrow; posterior margin delimited, triangular median lobe with shallow fissure, semicircular lateral margins without visible fissures. Conspicuously raised, granular pterygostome. Orbit ( Fig. 23 View FIGURE 23 I, J) long; eye peduncle filling orbit, short, immobile (or sessile); cornea reduced, with reduced pigmentation. Third maxillipeds ( Fig. 30 View FIGURE 30 E, F) not filling buccal cavern when closed; merus elongated, narrower than ischium, anterior portion subtriangular, outer margin nearly straight, anteroexternal angle not produced; ischium elongated, about twice as long as merus. Chelipeds ( Figs. 9 View FIGURE 9 ; 40A‒D) subequal in length, with short setae except propodus of major chela of male; major chela of large males ( Fig. 40 View FIGURE 40 A) with conspicuously curved, thin fingers, smooth except large teeth near tips, inner surface with prominent swelling near base of fingers in large adults; fingers of minor chela ( Fig. 40 View FIGURE 40 B, D) subcircular in cross-section, not laterally flattened, gently tapering to tip, scissor-like, cutting margins with distinct sharp teeth; fingers of both chelipeds of female ( Fig. 9 View FIGURE 9 C, F, H) slender, armed with sharp (some obtuse) teeth. Inner margin of cheliped carpus smooth ( Fig. 9 View FIGURE 9 ). Ventral margins of cheliped merus of female with large tubercles. Meri of ambulatory legs ( Fig. 9 View FIGURE 9 ) with small teeth along dorsal, ventral margins, dorsal margin of male P5 unarmed; long to short setae along margins of carpi, propodi, dactyli, P5 merus, dorsal margins of P2–P4 meri. Fused thoracic sternites 1, 2 ( Fig. 51 View FIGURE 51 F) triangular, short; fused thoracic sternites 3, 4 ( Figs. 51 View FIGURE 51 F; 86F; 90F) relatively broad; semi-circular, granular ridge along middle portion of thoracic sternites 3, 4 of female. Male thoracic sternite 8 ( Fig. 58 View FIGURE 58 F) short, quadrate; “supplementary plate” short, longer at rounded outer margin; structures tightly appressed with most of penis concealed. Male pleon ( Figs. 51 View FIGURE 51 F; 58F) with lateral margins of somite 6 straight, margins of fused somites 3–5 nearly straight; telson proportionally long. G1 ( Fig. 70 View FIGURE 70 A–D) stout, distal segment curved, with spinules, distal segment slightly curved outwards. G2 ( Fig. 70 View FIGURE 70 E) about one third G1 length, slightly curved, slender, distal segment long, slightly curved. Somites of female pleon ( Fig. 86 View FIGURE 86 F) short, with convex lateral margins; telson proportionally elongated. Sterno-pleonal cavity of female ( Fig. 90 View FIGURE 90 F) moderately deep, vulvae close together in flat portion of thoracic sternite 6.

Distribution. Indo-West Pacific region: Eastern Indian and western Pacific oceans.

Kingdom

Animalia

Phylum

Arthropoda

Class

Malacostraca

Order

Decapoda

Family

Chasmocarcinidae

Loc

Chasmocarcinops Alcock, 1900

Ng, Peter K. L. & Castro, Peter 2016
2016
Loc

Chasmocarcinops

De 2009: 32
Dai 1991: 393
Serene 1964: 264
Tesch 1918: 280
Alcock 1900: 334
1900
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