Procepon insolitum Shiino 1937

Procepon insolitum Shiino, 1937 (Fig. 5) Procepon insolitum Shiino, 1937: 480–486, figs. 3–5 (Hatekeshima, Tanabe Bay, Japan, infesting “ Gebia major ” (= Upogebia major (De Haan, 1841); Shiino, 1958: 49–50, pl. 3 fig. 5, text fig. 11 (Sugashima, Mie Prefecture, Japan, infesting U. issaeffi (Balss, 1913); Bourdon, 1967: 167 (mention); Bourdon, 1968 82 (mention); Shiino, 1972: 8 (list); Markham, 1985: 28, 29, fig. 13 (Phuket, Thailand, infesting U.cf. lincolni Ngoc-Ho, 1977); Markham, 1988: 17 (mention); Markham, 1990: 556 (mention); Saito et al., 2000: 43 (list); Kensley, 2001: 225 (list); Markham, 2001: 199, 201 (list); Itani, 2004a: 14, 15, figs. 1, 2, 4 (Japan, infesting Upogebia sp.); Itani, 2004b: 38 (Japan, infesting U. carinicauda (Stimpson, 1860), U. major, and U. yokoyai Makarov, 1938); An et al., 2009: 242 (mention); Chapman et al., 2011: 1228 (mention); Itani et al., 2014: 111 (mention); Sato et al., 2021: 20, 21, fig. 3B (Ariake and Yatsushiro Seas, Kyushu, Japan, infesting U. major). “ Bopyrus in left gill chamber”— Sakai, 2006: 141454 (SMF 30541). Material Examined: Japan: Mature female (10.5 mm) (SMF 58107) and mature male (4.2 mm) (SMF 58107), infesting left branchial chamber of female Upogebia yokoyai Markarov, 1938 (12.9 mm CL), mature female (9.2 mm), infesting right branchial chamber of female U. yokoyai (12.0 mm CL), Umino-nakamuchi, Irimote-jima, Ryukyu Islands, coll. K. Sakai, 14 Feb 1995 (SMF 30541). Hosts: Upogebia carinicauda (Stimpson, 1860), U. issaeffi (Balss, 1913), U. cf. lincolni Ngoc-Ho, 1977, U. major (De Haan, 1841), and U. yokoyai Makarov, 1938 (see Markham 1985; Itani 2004). Remarks: Upogebia yokoyai was first reported as a host for Procepon insolitum by Itani (2004). SMF 30541 contains three males (9.9–14.0 mm CL), eight females (7.8–12.5 mm CL), and one ovigerous female (11.2 mm CL); Sakai (2006: 145) stated that one female was infested but the total is two infested females. The female (Fig. 5A, B) and male (Fig. 5C, D) specimens match closely the original description of Procepon insolitum (Shiino, 1937).