Psaumis cavipes (Dana, 1852)

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Psaumis cavipes (Dana, 1852) ( Fig. 2B )

Psaumis cavipes Serène 1984: 129–130 , fig. 76, pl. XVIII F (for complete synonymy); Ng et al. 2008: 196 [List]; Ng et al. 2017: 87 (for complete collection records from Taiwan).

Material examined: 1 ò 1 ñ, NMNS 8772- 45–46, 3.8–5.1 × 2.3–3.3, Shanfu, Liuqiu Township, Pingtung County, 3–4 May 2007; 1 ò, NMNS 8772-47, 5.8 × 3.5, Shanfu, Liuqiu Township, Pingtung County, 24 October 2008; 1 ñ, NMNS 8772-48, 8.5 × 5.4, Wanlitong, Pingtung County, 13 November 2009.

Distribution: Indo-West Pacific; Fiji and Samoa ( Dana 1852b; Serène 1984).

R e m a r k s: P s a u m i s Kossmann, 1 8 7 7 was previously classified within the subfamily Actaeinae ( Serène 1984: 92–94) . However, Lai et al. (2011) proposed that this genus belongs to the subfamily Euxanthinae Alcock, 1898 based on both morphological and molecular evidence. Serène (1984: 129) reinstated the genus, following discussions on the identification of A. cavipes (Dana, 1852) by Guinot (1976: 203).

The genus is a small taxonomic group represented by only two species: P. cavipes (Dana, 1852) (type locality: Fiji and Samoa) and P. fossulata (Girard, 1859) (type locality: Red Sea) ( Serène 1984). While Serène (1984: 130) synonymized P. fossulata as junior name of P. cavipes, Ng et al. (2008) considered P. fossulata as a valid species. Alcock (1898: 148) distinguished Actaea fossulata (Girard, 1859) (= P. fossulata ) (collection location: Great Coco Island and East Island, Andamans) from P. cavipes based on differences in the morphology of the front projections, carapace lobes, chelipeds, and ambulatory legs.

The morphology of the current species ( Fig. 2B ) matches with diagnosis features of Psaumis cavipes , which include numerous small cavities on the dorsal carapace and ambulatory legs, and three distinct cavities on the suborbital and subhepatic regions ( Serène 1984: 129).

Figures

Fig. 2. Actaeodes tomentosus (H. Milne Edwards, 1834) (female, CW 6.9 mm; NMNS 8772-1), A; Psaumis cavipes (Dana, 1852) (female, CW 8.6 mm; NMNS 8772-45), B; Chlorodiella barbata (Borradaile, 1900) (male, CW 4.1 mm; NMNS 8772-11), C–G: A–C, habitus, dorsal view; D, right chela, external view; E, left chela, external view; F, G1, right, external view; G, G1, right, distal area, external view. Scale bars: A–B = 2.0 mm; C = 1.0 mm; D–E = 0.5 mm; F–G = 0.1 mm.