Chinommatia littoralis ( Tesch, 1918 ) Tesch, 1918

Ng, Peter K. L. & Castro, Peter, 2016, Revision of the family Chasmocarcinidae Serène, 1964 (Crustacea, Brachyura, Goneplacoidea), Zootaxa 4209 (1), pp. 1-182 : 70

Chinommatia littoralis ( Tesch, 1918) n. comb.

( Figs. 15 A; 25E; 32C; 43H)

Hephthopelta littoralis Tesch, 1918: 233 , pl. 9, fig. 3 [type localilty: Indonesia] .— Serène 1968: 92 [in list].— Zarenkov 1972: 238, figs. 1–4 [Vietnam]. — Jiang 2008: 770 [in list] [South China Sea].—Ng et al. 2008: 76 [in list].

Not Hephthopelta littoralis— Chen 1998: 298, fig. 22 [Nansha Is, 53‒105 m]. [= Chinommatia cavimanus ( Rathbun, 1914]

Type material. Holotype female (3.5 × 4.9 mm) (NNM-ZMA), Indonesia, north coast of Ceram , Waru Bay, Siboga Expedition , stn 174, 18 m, 0 7.1899.

Diagnosis. Carapace ( Fig. 15 A; Tesch 1918: pl. 9, fig. 3, as Hephthopelta littoralis ) subtrapezoidal, convex, short tomentum, 1.4 wider than long in female holotype; front nearly straight; anterolateral margins arcuate, minutely granular with granules higher along lateral margins, without distinct lobes or teeth. Eye peduncle ( Fig. 25 E) long. Epistome ( Fig. 25 E) with semicircular median lobe, semicircular lateral margins. Third maxilliped ( Fig. 32 C; Zarenkov 1972: fig. 1– 4III, as H. littoralis ) merus ovate, anteroexternal angle rounded; ischium rectangular, slightly longer than merus. Proportionally short ambulatory legs ( Fig. 15 A), with short tomentum ( Tesch 1918: pl. 9, fig. 3, as H. littoralis ). Fingers of minor chela of female holotype ( Fig. 43 H) subcircular in cross-section, scissorlike, cutting margins with short teeth. Inner margin of cheliped carpus with short tooth ( Tesch 1918: pl. 9, fig. 3, as H. littoralis ; Zarenkov 1972: fig. 1– 4I, as H. littoralis ). Fused thoracic sternites 1, 2 semicircular, proportionally narrow, long. Male, adult female unknown.

Remarks. The holotype specimen is a small female, but in all key characters, it appears to be a species of Chinommatia n. gen. Zarenkov (1972) reported “ Hephthopelta littoralis ” from the South China Sea , and it agrees well with the type, although his specimen is depicted with teeth on the cheliped meri rather than tubercles ( Zarenkov 1972: fig. 1– 4I). They otherwise agree in the form of the carapace, long eye peduncles, and the morphology of the third maxillipeds, and thus we believe they are conspecific. The shallow-water record of Zarenkov’s South China Sea material (10–72 m) also supports their conspecificity (the type was from 18 m). The male pleon, chelae, and gonopod features as figured by Zarenkov (1972) support the inclusion of the species in Chinommatia n. gen.

Distribution. Western Pacific Ocean ( Indonesia and South China Sea). Depth: 10– 72 m.

Figures

FIGURE 15. Overall dorsal view of species of Chinommatia n. gen. and Notopelta n. gen. A, Chinommatia littoralis, Indonesia: holotype female 3.5 × 4.9 mm (NNM-ZMA); B, Chinommatia bicuspida n. sp., Papua New Guinea: holotype male 10.7 × 12.9 mm (MNHN-IU- 2011 - 0954); C, Chinommatia bicuspida n. sp., Fiji: male 12.7 × 10.6 mm (MNHN-IU- 2013 - 9056); D, Chinommatia bicuspida n. sp., Papua New Guinea: paratype female 16.7 × 20.4 mm (MNHN-IU- 2011 - 3461); E, F, Chinommatia turpis n. sp., Vanuatu: holotype male 3.1 × 4.3 mm (MNHU-IU- 2013 - 9044); G, H, Notopelta mortenseni, Indonesia: holotype male 5.0 × 6.9 mm (ZMUC CRU- 7397); I, Notopelta mortenseni, Indonesia: female 5.9 × 4.1 mm (ZMUC CRU- 007768).

FIGURE 25. Frontal view of species of Chinommatia n. gen. and Notopelta n. gen. A, Chinommatia cavimanus, Philippines: male 10.1 × 12.2 mm (ZRC 2015.228); B, Chinommatia bicuspida n. sp., Papua New Guinea: paratype female 16.7 × 20.4 mm (MNHN-IU- 2011 - 3461); C, Chinommatia bruuni, Java Sea: male 3.4 × 4.0 mm (ZMUC CRU- 1524); D, Chinommatia bruuni, Malaysia: female 5.5 × 7.2 mm (ZRC 2013.0020), Malaysia; E, Chinommatia littoralis, Indonesia: holotype female 3.5 × 4.9 mm (NNM-ZMA); F, Chinommatia turpis n. sp., Vanuatu: holotype male 3.1 × 4.3 mm (MNHU-IU- 2013 - 9044); G, Notopelta mortenseni, Indonesia: holotype male 5.0 × 6.9 mm (ZMUC CRU- 7397).

FIGURE 32. Third maxilliped of species of Chinommatia n. gen. A, C. cavimanus, Philippines: male 10.1 × 12.2 mm (ZRC 2015.228); B, C. bruuni, Indonesia: male 3.4 × 4.0 mm (ZMUC CRU- 1524); C, C. littoralis, Indonesia: holotype female 3.5 × 4.9 mm (NNM-ZMA); D, C. bicuspida n. sp., Papua New Guinea: paratype female 16.7 × 20.4 mm (MNHN-IU- 2011 - 3461); E, C. turpis n. sp., Vanuatu: holotype male 3.1 × 4.3 mm (MNHU-IU- 2013 - 9044); F, Notopelta mortenseni, Indonesia: holotype male 5.0 × 6.9 mm (ZMUC CRU- 7397). Scale = 0.5 mm.

FIGURE 43. Chelae of species of Chinommatia n. gen. A, B, C. cavimanus, Philippines: male 10.1 × 12.2 mm (ZRC 2015.228); C, D, C. bruuni, Indonesia: 1 male 3.4 × 4.0 mm (ZMUC CRU- 1524); E, F, C. bicuspida n. sp., Fiji: male 12.7 × 10.6 mm (MNHN-IU- 2013 - 9056); G, C. bicuspida n. sp., Papua New Guinea: holotype male 10.7 × 12.9 mm (MNHN-IU- 2011 - 0954); H, C. littoralis, Indonesia: holotype female 3.5 × 4.9 mm (NNM-ZMA); I, J, C. turpis n. sp., Vanuatu: holotype male 3.1 × 4.3 mm (MNHU-IU- 2013 - 9044).