Gyge ovalis (Shiino, 1939)

Fig. 4

Metabopyrus ovalis Shiino, 1939b: 88 –91, figs. 7, 8 (Hakata Bay, Kyûsyû, Japan, infesting Upogebia major (De Haan, 1841) (subsequently reidentified as Upogebia issaeffi (Balss, 1913), see Remarks).— Shiino, 1958: 48 –49, fig. 10 (Japan, host unknown).— Codreanu, 1961: 140 (mention), fig. 1 (map).— Codreanu & Codreanu, 1963: 283 (mention).— Shiino, 1972: 7 (list).— Markham, 1982: 340 (mention).— Markham, 1985: 14 (mention).— Page, 1985: 196 (mention).— Kim & Kwon, 1988: 199, 201–203, 220, fig. 2 (South Korea, infesting U. major).— Markham, 2001; 198, 201 (list).— Itani et al., 2002: 72, fig. 1a9 (Seto, Inland Sea, Japan, infesting U. major).— Itani, 2004a: 16, fig. 3 A (mention).— Itani, 2004b: 37 –39, tables 3, 5 (Japan, infesting Austinogebia narutensis (Sakai, 1986), U. issaeffi, U. carinicauda (Stimpson, 1860), U. major, U. yokoyai Makarov,1938).— Nanri et al., 2011: 1056 (mention).— Kwon, 2012: 1, 4, 33–34, fig. 13 (South Korea, infesting U. major).

“bopyrid isopods” (in part) Itani, 2001: 5 (Japan, infesting U. yokoyai).

Gyge ovalis — Markham, 2004: 195–197, fig. 6 (Chang-Hua County, southwest Taiwan, infesting Austinogebia edulis (Ngoc- Ho & Chan, 1992)).— Yu & An, 2008: 692 (list).—An et al., 2009: 228–229, fig. 2 (Shandong Province, China, infesting U. major and A. wuhsienweni (Yu, 1931)) .— Kinoshita et al., 2010: 949–951, fig. 3 (Japan, infesting U. yokoyai).— Ubaldo et al., 2014: 557–564 (Seto Inland Sea, Japan, infesting U. major).— Hong, 2013: 336–3377, fig. 6 A, B (South Korea, infesting U. major).— Itani et al., 2014: 111 (mention).— Miura et al., 2014: 31 (table), 32, fig. 1C (Japan, infesting U. yokoyai).— Hong et al., 2015: 608, 612, 613 (South Korea, infesting U. major).— Asson et al., 2017: 222 (mention).

Material examined. Taiwan: Immature female (3.8 mm), mature male (2.1 mm), ex right branchial chamber of female Austinogebia edulis (8.0 mm CL), Yilan County, port at Tai-Chi, shallow water, coll. inland trawlers (ZRC 2016.0440)

Distribution. Japan, South Korea, Taiwan, and China.

Hosts. Austinogebia edulis (Ngoc-Ho & Chan, 1992), A. narutensis (Sakai, 1986), A. wuhsienweni (Yu, 1931), Upogebia carinicauda (Stimpson, 1860), U. issaeffi (Balss, 1913) (possible type host), U. major (De Haan, 1841) (probable type host), and U. yokoyai Makarov, 1938 .

Remarks. The host of the types was originally reported as Upogebia major (De Haan, 1841) in Shiino (1939b) but was changed to U. issaeffi (Balss, 1913) in Shiino (1958) and back again to U. major in Shiino (1972) . This species has been reported several times from U. major, including in a large-scale study of the host/parasite relationship by Ubaldo et al. (2014), but only once subsequently from U. issaeffi (Itani 2004b) . The identity of the type host is therefore most likely U. major, but only examination of the type host can solve this question. Markham (2004) included Codreanu (1941: 140) in his synonymy list under Metabopyrus ovalis, but nowhere in that paper is the species mentioned and there is no p. 140 in that article; the page was probably from Codreanu (1961) where the species is mentioned and the “1941” citation is therefore a lapsus for 1961. Chapman et al. (2012) incorrectly stated that the record of Gyge ovalis from Itani (2004b) was a misidentification of Orthione griffenis Markham, 2004 . Itani’s (2004b) identification was correct, albeit under the original combination of Metabopyrus ovalis . The record in Itani’s (2004b) Table 3 that is referrable to O. griffenis is actually “ Pseudioninae sp. 1” (Williams & An 2009; Itani et al. 2014). The present record (Fig. 4) is only the second from Taiwan and A. edulis is the only known host in Taiwan.