Parasacculina shiinoi

Parasacculina shiinoi (Lützen, Itani, Hong, Rees & Glenner, 2016) Sacculina shiinoi Lützen, Itani, Hong, Rees & Glenner, 2016: 206–208, figs. 1–3, 4A, B, 5A (Japan, infesting Upogebia issaeffi (Balss, 1913) and Upogebia yoyokai Makarkov, 1938). Parasacculina shiinoi — Høeg et al., 2019: 644 (designation as type species of Parasacculina); Golubinskaya et al., 2021: 54 (phylogenetic analysis). ? Parasacculina shiinoi — Jung et al., 2021: e12281 (South Korea, infesting Upogebia major (De Haan, 1841); Jung, 2024: 1359503 (South Korea, infesting U. major); Jung & Park, 2024: 1 (South Korea, infesting U. major) (see Remarks). Material Examined: Japan: Mature female (9.9 x 6 mm) (SMF 58112), attached to ventral second abdominal segment of male U. issaeffi (14.8 mm CL), Kokatu-jima, Ana, Tokushima, coll. K. Sakai & S. Maeda, 16 Sep 1993 (SMF 30605). Mature female (12.3 x 8.7 mm) (SMF 58110), attached to ventral second abdominal segment of female U. issaeffi (24.5 mm CL), Kokatu-jima, Anan, Tokushima Prefecture, coll. K. Sakai, 26 Apr 1992 (SMF 30597). Mature female (10.0 x 7.1 mm) (SMF 58108), attached to ventral second abdominal segment of female U. yokoyai (16.6 mm CL), Biology Laboratory, Tokushima, coll. K. Sakai, 19 Oct 1958 (SMF 37815 ex Biol. Lab Tokushima 10537-856-1). Hosts: Upogebia issaeffi (Balss, 1913), U. sakaii Ngoc-Ho, 1994 and U. yokoyai Makarov, 1938 (see Lützen et al. 2016); possibly U. major (De Haan, 1841) (see Remarks). Remarks: No mention was made in Sakai (2006) of any rhizocephalan parasites. SMF 30605 contains 10 male U. issaeffi, one infested by Gyge ovalis (Shiino, 1939) and one infested with Parasacculina shiinoi. SMF 30597 contains three specimens, of which one is parasitized by P. shiinoi. Jung et al. (2021) identified two externae collected from a pair of U. major hosts from South Korea as P. shiinoi but this conflicts with the statement of Lützen et al. (2016) that Sacculina upogebiae Shiino, 1943 is the only species found parasitizing U. major. However, Jung et al. (2021) showed a 98.8% mtDNA 16S rDNA similarity between their specimens and GenBank data from an externa obtained from the host U. yokoyai; thus, either the identification of one of the hosts is wrong or P. shiinoi is also found on U. major.