(Fig. 1C, D)
Pagurus longitarsus De Haan, 1849: 211, fig. 3 (type locality: Japan).
Pagurus asper H. Milne Edwards, 1848: 62 (type locality: Indian Seas); Low & Rahayu, 2014: 393.
Clibanarius longitarsus – Fize & Serène, 1955: 83, fig. 11, pl. 3, figs. 1, 7, 10, 13; Dechancé, 1964: 31, fig. 4; Rahayu & Forest, 1992: 762, figs. 4b, 5b, 6b; Rahayu, 1996: 336; McLaughlin et al., 2007: 119, unnumbered fig.
Material examined. 1 female, 9.5 mm (ZRC 2021.0102), St John’s Island, 18 May 2011; 1 male, 4.8 mm, 2 females, 8.9–9.4 mm (ZRC 2021.0103), st. SW95, mouth of Sungei Besar, 01°25.0258′N 103°67.607′E, mudflat with mangrove, 26 October 2012.
Colour in life. In general greenish brown or blackish brown with longitudinal bright blue stripe on the lateral faces of P2 and P3 (Fig. 1C, D). Haig & Ball (1988) and Rahayu (2003) gave descriptions of colouration and colour variation of this species.
Distribution. Widely distributed in the Indo-West Pacific; intertidal.
Remarks. Clibanarius longitarsus is commonly found in brackish waters, mudflat, and mangrove environments. In its habitat, this species is easily recognised by its bright blue longitudinal stripe on the pereopods.