Nematopagurus australis ( Henderson, 1888 )

Osawa, Masayuki & Ota, Yuzo, 2020, New Records of Species of Gebiidea and Anomura (Crustacea: Decapoda) from the Sea of Japan, Species Diversity 25, pp. 295-307 : 298-300

Nematopagurus australis ( Henderson, 1888) ( Figs 2G , 3C )

Restricted synonymy.

Catapagurus australis Henderson, 1888: 76 , pl. 8, fig. 1 (type locality: Arafura Sea, Challenger stn 188, 09°59′S, 139°42′E; 51 m).

Nematopagurus australis: McLaughlin 1997: 505 ; McLaughlin 2004: 221, fig. 26; Komai and Takeda 2006: 99; McLaughlin et al. 2007: 234, 2 unnumbered figs.

Nematopagurus cf. australis: McLaughlin 2002: 436 , fig. 7F–H.

Material examined. Tottori Prefecture. Off Nagaobana

(35°55′N, 134°00´E), Tottori, 100 m, beam trawl, 15 May 2018, coll . Y . Ota, 1 female (sl 4.3 mm), TRPM-784.

Distribution. Japan, Taiwan, South China Sea, Malaysia, Indonesia, New Caledonia, and Fiji; subtidal to 292 m, possibly to 417 m ( McLaughlin 2004). Japanese records include Suruga and Sagami Bays and Tottori Prefecture in Honshu mainland ( McLaughlin 2004; Komai and Takeda 2006; present study). The present specimen reveals the first record of this species from the Sea of Japan.

Habitat. Syntypes collected from green mud substrate and reef ( McLaughlin 2004). The present specimen was collected from the muddy sand substrate.

Remarks. Although the right cheliped of the present specimen is missing, there is no doubt on the species identification because the specimen has other characters diagnostic to N. australi s such as the left chela unarmed or with a median row of small spines on the dorsal surface, the dactylus of the left cheliped with a row of spines on the dorsomesial margin; and the dactylus of the left third pereopod being more than 1.5 length of the propodus, prominently curved ventrally and twisted, and with ventral marginal spines not clearly visible in lateral view (cf. McLaughlin 2004; McLaughlin et al. 2007).

Figures

Fig. 2. Preserved specimens. A, Austinogebia narutensis (Sakai, 1986), female (cl 18.9mm), TRPM-780, left lateral view; B, same, carapace, dorsal view; C, same, left lateral view, anterior part of body, showing pereopod 1; D, Austinogebia narutensis (Sakai, 1986), male (cl 17.9mm), TRPM-780, left lateral view; E, Paguristes gonagrus (H. Milne Edwards, 1836), male (sl 6.4mm), TRPM-782, dorsal view; F, Paguristes versus Komai, 2001, male (sl 5.8mm), TRPM-783, dorsal view; G, Nematopagurus australis (Henderson, 1888), female (sl 4.3mm), TRPM-784, dorsal view; H, Galathea guttata Osawa, 2004, male (pcl 3.1mm), TRPM-785, dorsal view; I, Munida agave Macpherson and Baba, 1993, ovigerous female (pcl 7.4mm), TRPM-788, dorsal view.

Fig. 3. Fresh specimens. A, Paguristes gonagrus (H. Milne Edwards, 1836), male (sl 6.4mm), TRPM-782, dorsal view; B, Paguristes versus Komai, 2001, male (sl 5.8mm), TRPM-783, right lateral view; C, Nematopagurus australis (Henderson, 1888), female (sl 4.3mm), TRPM- 784, dorsal view; D, Munida agave Macpherson and Baba, 1993, ovigerous female (pcl 7.5mm), TRPM-787, dorsal view; E, Munida pherusa Macpherson and Baba, 1993, ovigerous female (pcl 7.7mm), TRPM-802, dorsal view; F, Munida pherusa Macpherson and Baba, 1993, male (pcl 6.6mm), TRPM-802, dorsal view; G, Paramunida tricarinata (Alcock, 1894), ovigerous female (pcl 7.9mm), TRPM-790; H, Pagurus nipponensis (Yokoya, 1933), ovigerous female (sl 5.9mm), TRPM-798; I, Bathymunida brevirostris (Yokoya, 1933), female (pcl 5.4mm), TRPM-801.