Pugettia vesicularis ( Rathbun, 1907 ) Yan & Lee & Forges & Ng, 2021

Yan, Bee, Lee, Forges, Bertrand Richer De & Ng, Peter K. L., 2021, The generic affinities of the Indo-West Pacific species assigned to Rochinia A. Milne-Edwards, 1875 (Crustacea: Brachyura: Majoidea: Epialtidae), Raffles Bulletin of Zoology 69, pp. 19-44 : 33

Pugettia vesicularis ( Rathbun, 1907) , new combination

( Figs. 6D–F , 8E, F )

Scyramathia vesicularis Rathbun, 1907: 73 , pl. 5 fig. 7, pl. 8 fig. 1–1a (type locality: Southeast of Hood island, Galapagos).

Rochinia versicularis – Rathbun, 1925: 210 (key), 221, pl. 230. – Garth, 1958: 283 (key), 284, pl. P fig. 6, pl. 31 fig. 1. – Tavares, 1991: 161 (list), 170, 174, fig. 4C. – Casadío et al., 2005: 159 (list). – Ng & Richer de Forges, 2007: 63 (list). – Ng et al., 2008: 106 (list). – Pettan, 2013: 81, 86 (key), figs. 15a, b, 22d. – Tavares & Santana, 2018: 223 (list).

Material examined. Holotype: male (14.6 × 10.6 mm) (USNM 32860), stn 4642, southeast of Hood Island (= Española Island ), Galapagos Island, coll. 7 November 1904. Others: 1 ovigerous female (13.4 × 10.0 mm), 1 female (9.3 × 6.7 mm) (USNM 32860), same data as holotype.

Remarks. Little is known about P. vesicularis . The species was described based on four specimens collected from southeast of Hood Island, Galapagos Islands, and Rathbun (1907) indicated the single male specimen as the holotype. She did not describe the G1 but the overall morphology was noted to be similar to that of Samadinia pulchra due to its spiny carapace ( Rathbun, 1907). It was also observed by Rathbun (1907: 73) that the difference between the species is in the placement of spines on the carapace and having shorter ambulatory legs. The G1 figured by Garth (1958: 535, pl. P fig. 6) shows three lobes at its extremity (see also Griffin & Tranter, 1986a: 175; Tavares, 1991: 170, fig. 4C). This G1 morphology is distinct from that of Samadinia ( Fig. 4A–M ), which has single distal sharp tip. Garth (1958) commented that this species should be removed from Rochinia to its own genus due to the morphology of the G1 but did not take any formal action. After examining the morphology of the G1 of this species ( Fig. 9E, F ), it is here shown to be different from Rochinia (see Tavares & Santana, 2018: fig. 13I, J), Scyramathia (see Tavares & Santana, 2018: fig. 13A, B), and Samadinia ( Fig. 4A–M ). It is more similar to the typical form seen in Pugettia (see also Garth, 1958: pl. L figs. 1–7).

A total of 24 species are now recognised in Pugettia ( Table 1), but the different external morphologies of these species suggest a revision is necessary and Pugettia is probably not monophyletic.

Distribution. This species is only known from the Galapagos Islands ( Rathbun, 1907).

Figures

Fig. 6. A–C, Oxypleurodon fultoni (Grant, 1905) new combination, holotype male (8.2 × 5.1 mm) (AM G.5427), Australia; D–F, Pugettia vesicularis (Rathbun, 1907) new combination, holotype male (14.6 × 10.6 mm) (USNM32860), Galapagos. A, D, overall dorsal view; B, E, overall ventral view; C, F, lateral view of carapace.

Fig. 8. A–C, Siderochinia kagoshimensis (Rathbun, 1932) new combination, holotype male (11.2 × 6.8 mm) (USNM 48253), Japan; D–F, S. aglaos, new species, holotype male (10.7 × 6.9 mm) (ZRC 2016.0549), South China Sea. A, D, side view of cardiac spine; B, E, dorsal view of intestinal spine along lateral carapace margin; C, F, dorsal view of P5.

Fig. 4. Left G1. A–C, Samadinia longispina Ng & Richer de Forges, 2013, holotype male (25.3 × 17.9 mm) (MNHN-IU-2011-4190) (after Ng & Richer de Forges, 2007: fig. 4A–D); D–G, S. moluccensis (Griffin & Tranter, 1986) new combination, paratype male (11.5 × 6.9 mm) (RMNH De:103.737), Java Sea; H, I, S. granulosa (Ng & Richer de Forges, 2013) new combination, paratype male (6.5 × 4.6 mm) (MNHN-IU-2011-2944b), Papua New Guinea; J–M, S. debilis (Rathbun, 1932) new combination, male (27.0 × 19.2 mm) (NSMT-Cr 12139), Japan. A, D, H, J, ventral view; B, E, K, ventral view of distal portion; C, G, M, dorsal view of distal portion; F, I, L, dorsal view. Scale bar = 1 mm.

Fig. 9. Left G1 and G2. A, B, Laubierinia globulifera (Wood-Mason, in Wood-Mason & Alcock, 1891) new combination, male (9.2 × 6.0 mm) (AM P.34652), Indonesia; C, D, Oxypleurodon fultoni (Grant, 1905) new combination, holotype male (8.2 × 5.1 mm) (AM G.5427), Australia; E, F, Pugettia vesicularis (Rathbun, 1907) new combination, holotype male (14.6 × 10.6 mm) (USNM32860), Galapagos; G–J, Siderochinia kagoshimensis (Rathbun, 1932) new combination, holotype male (11.2 × 6.8 mm) (USNM 48253), Japan (after Lee et al., 2017: fig. 11E, F); K, L, S. aglaos, new species, holotype male (10.7 × 6.9 mm) (ZRC 2016.0549), South China Sea (after Lee et al., 2017: fig. 11G–J). A, C, E, G, K, ventral view; B, D, F, H, L, dorsal view; I, ventral view of G2; J, dorsal view of G2. Scale bar = 1 mm.