Dardanus lagopodes ( Forskål, 1775 )

Rahayu, Dwi Listyo, 2022, Hermit crabs of Singapore (Crustacea: Decapoda: Anomura: Diogenidae, Paguridae), with description of two new species, Raffles Bulletin of Zoology 70, pp. 329-363 : 332

Dardanus lagopodes ( Forskål, 1775)

( Fig. 2C, D )

Cancer lagopodes Forskål, 1775: 93 (type locality: Red Sea).

Pagurus sanguinolentus – Forest, 1953b: 559, 560, figs. 12–14 (in part); Fize & Serène, 1955: 166–173, fig. 25, pl. 4 no. 4–5 (in part) (Not Pagurus sanguinolentus Quoy & Gaimard, 1824 ).

Pagurus affinis H. Milne Edwards, 1836: 274 (type locality: Sri Lanka).

Pagurus euopsis Dana, 1852: 452 , 453 (type locality: Upolu, Samoa); Estampador, 1937: 503 (in part).

Dardanus lagopodes – Lewinsohn, 1969: 32, figs. 1, 2, pl. 2; Ball & Haig, 1972: 92, 93; Haig & Ball, 1988: 166; McLaughlin et al., 2007: 91–93, unumbered fig.; Malay et al., 2018: 39, figs. 3H, 5A, B.

Material examined. 1 male, 14.9 mm ( ZRC 2021.0106 ), Singapore Strait , 7 June 2013 .

Colour in life. Shield mottled grey and dark brown, large reddish brown blotch anteriorly; ocular peduncles whitish yellow, narrow orange line just next to corneas; cheliped brownish grey, fingers with tinge of dark red or dark brown. P2, P3 whitish yellow, carpi and meri with large blotch of dark brown on dorsal surface. All setae reddish brown with yellowish white tip ( Fig. 2C, D ).

Distribution. Widely distributed in the Indo-West Pacific; intertidal to shallow subtidal on coral rubble bottom.

Remarks. Malay et al. (2018) revised the status of the two forms of colour (black/blue/brown form and red form) long identified with D. lagopodes (e.g., Fize & Serène, 1955; Ball & Haig, 1972; Haig & Ball, 1988; McLaughlin et al., 2007), and determined that the black/blue/brown form represents the true D. lagopodes .

Figures

Fig. 2. A, B, Dardanus hessii (Miers, 1884), male, 13.8 mm (ZRC 2021.0105), B, photo from Rahayu & Ong, 2015; C, D, Dardanus lagopodes (Forskål, 1775), male, 14.9 mm (ZRC 2021.0106); E, Dardanus megistos (Herbst, 1804), not measured, St John’s Island, 2013.