Pugettia Dana, 1851

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 : 31-33

Pugettia Dana, 1851

Pugettia Dana, 1851a: 268 . – Miers, 1879: 650. – Rathbun, 1925: 167. – Garth, 1958: 186. – Sakai, 1965: 72. – Griffin & Tranter, 1986a: 92. – Ng et al., 2008: 101 (list). – Wicksten & Stachowicz, 2013: 359.

Mimulus Stimpson, 1860: 199 . – Miers, 1879: 649. – Rathbun, 1925: 182. – Garth, 1958: 183. – Ng et al., 2008: 101 (list).

(For the complete synonymy, refer to Wicksten & Stachowicz, 2013: 359).

Type species. Pugettia gracilis Dana, 1851 , subsequent designation by Miers (1879).

Species composition. With 24 species ( Table 1).

Comparative material examined. See Appendix 1.

Diagnosis. Carapace pyriform, tuberculate or uneven, with 2 prominent, angular, lateral projections, separated by a concave interspace. Pseudorostral spines short, slender, relatively straight, subparallel to diverging at approximately 45° angle or less. Supraorbital eave well-developed, with distinct preorbital angle; postorbital lobe slender with blunt anterior margin to slender, curved spine. Carapace smooth or with spines ( Garth, 1958: pl. K fig. 1, pl. 19, 20 figs. 1, 2, pl. 21 figs. 1, 2; Fig. 6D ). Antennal flagellum as long as or longer than pseudorostral spines. Basal antennal article with distal angle sharp, distinct; some with sharp basal angle ( Garth, 1958: pl. K fig. 4; Fig. 6E ). Distal angle of buccal frame blunt, slightly raised. Pterygostomial region with granules or short spines on outer margin ( Fig. 6E ). Chelipeds of male well developed; propodus slightly inflated, outer margin with carinate; carpus with outer margin carinate; merus triangular in cross-section, carinate on all margins. Ambulatory legs slender, articles with rounded margins; merus with small spine or blunt distal angle; P2 longest ( Garth, 1958: pl. K fig. 1, pl. 19, 20 figs. 1, 2, pl. 21 figs. 1, 2; Fig. 6D ). Male thoracic sternum slightly concave anteriorly; sternites 3, 4 wide, lateral margin slightly constricted. Male pleon broadly triangular to slightly rectangular, telson triangular to slightly dome-shaped; surface of somites smooth ( Garth, 1958: pl. K fig. 2; Fig. 6E ). G1 relatively straight to slightly curved, with 3 distinct lobes on distal tip ( Garth, 1958: pl. L figs. 1–7; Fig. 9E, F ); G2 slightly curved, distal outer margin concaved forming C-shaped curve, distal tip sharp.

Remarks. There are currently 23 recognised species assigned to Pugettia Dana, 1851 ( Ng et al., 2008; Komatsu, 2011; Wicksten & Stachowicz, 2013; Ohtsuchi et al., 2014; Lee et al., 2017; Ohtsuchi & Kawamura, 2019; Ohtsuchi et al., 2020), with a distribution across the northern Pacific. In addition to the review by Wicksten & Stachowicz (2013), who synonymised Mimulus Stimpson, 1860 , with Pugettia , the genus has not been revised as a whole. Lee et al. (2017) transferred one species to Rochinia sensu lato, R. kagoshimensis ( Rathbun, 1932) , but in the context of the present reappraisal, it is here transferred to its own genus (see Siderochinia , new genus).

As shown by Garth (1958), Pugettia has the scyriform type of G1, i.e., the distal tip of the G1 forming three distinct lobes, a character which is unique to this genus. Examination of the morphology of species of Rochinia sensu lato indicate that there is one species that possesses the same G1 morphology as Pugettia species , P. vesicularis , new combination, from the Galapagos Islands ( Fig. 9E, F ).

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. 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.