Pseudostegias setoensis Shiino, 1933

Williams, Jason D. & Boyko, Christopher B., 2015, Abdominal bopyrid parasites (Crustacea: Isopoda: Bopyridae: Athelginae) of diogenid hermit crabs from the western Pacific, with descriptions of a new genus and four new species, Raffles Bulletin of Zoology 64, pp. 33-69 : 61

Pseudostegias setoensis Shiino, 1933

(Fig. 15)

Pseudostegias setoensis Shiino, 1933: 290–293 , fig. 16; Shiino, 1950: 161, 162; Shiino, 1952: 35, 36; Shiino, 1958: 68; Lemos de Castro, 1965: 105, 106–108; Shiino, 1972: 9; Markham, 1982: 369–373, 385; Morton & Morton, 1983: 96, 98, 201, fig. 7.5, table 10.2; Markham, 1985: 3, 51–52, 55, 63, fig. 25, table 1; Page, 1985: 201, 203; Harada, 1991: 202; Markham, 1992: 299, table 1; Huang, 1994: 530; Williams & Boyko, 1999: 720; Saito et al., 2000: 45; Kensley, 2001: 226; Kensley & Chan, 2001: 481; Poore et al., 2002: 116; Li, 2003: 140, 155, table 1; Markham, 2003: 72, 73; Boyko, 2004: 677; Markham, 2010: 184–195 (references only); McDermott et al., 2010: 11 (table); An et al., 2011: 2906–2010 , figs. 4, 5 ( Hong Kong specimens only).

? Pseudostegias setoensis — Markham, 1994: 226, 247–249, fig. 17; Markham, 2010: 185 (material examined) (see Remarks).

? Pseudostegia [sic] setoensis — Bruce, 2007: 278 (see Remarks).

Not Pseudostegias setoensis — Dunbar & Coates, 2000: 49, fig 1; Poore et al., 2002: 116; Markham, 2010: fig. 34, 35; An et al., 2011: 2906-2910 , fig. 3 (Maozhou material only) [= Pseudostegias dulcilacuum Markham, 1982 ].

Material examined. Taiwan: Immature female (3.6 mm), mature male (0.8 mm) ( USNM 1283427 ), infesting female Clibanarius virescens, Aimen Beach , Penghu, coll. R. Yoshida, 4 August 2011; 3 mature females (9.2 mm, 8.5 mm and 7.5 mm), immature female (5.2 mm), 3 mature male

(3.8 mm, 3.0 mm and 1.5 mm) ( USNM 1283427), infesting C. virescens (parasites detached from four female hosts (3.3 mm, 3.4 mm, 3.7 mm SL) and one male host (5.1 mm SL)), Aimen Beach, Penghu, coll. R. Yoshida , 4 August 2011 .

Type locality. Seto , Japan ( Shiino, 1933) .

Distribution. Japan ( Shiino, 1933), Taiwan ( Shiino, 1958), Hong Kong ( Markham, 1982; An et al., 2011), Thailand ( Markham, 1985), possibly Chesterfield Islands, New Caledonia ( Markham, 1994, but see Remarks).

Hosts. Diogenidae : Clibanarius bimaculatus (De Haan, 1849) ( Shiino, 1933) , C. padavensis de Man, 1888 ( Markham, 1985) , C. ransoni Forest, 1953 ( Markham, 1982) , C. striolatus Dana, 1852 ( Shiino, 1958) , C. virescens (new host), possibly Strigopagurus boreonotus Forest, 1995 ( Markham, 1994, see Remarks).

Size range (Length). Females: to 16.5 mm ( Shiino, 1958), males: to 3.8 mm (herein).

Remarks. Based on a preliminary examination in 2002 by one of us (CBB) of the MNHN Chesterfield Islands and New Caledonia material reported on by Markham (1994; later cited by Bruce, 2007), we suspect that these specimens are not Pseudostegias setoensis but probably represent an undescribed species. Several attempts by MNHN museum staff to locate these specimens were unsuccessful until recently, when they were found but unfortunately arrived on loan to us after the review process was completed for the present paper. See Remarks under P. dulcilacuum for the characters that distinguish P. setoensis from P. dulcilacuum and for comments on the mislabeling of the Australian specimens figured by Markham (2010: figs. 34, 35) as P. setoensis (= P. dulcilacuum ). The present record is the second for P. setoensis from Taiwan; the first was from Shiino (1958). Clibanarius virescens was erroneously reported as a host of P. setoensis by Dunbar & Coates (2000) in Australia but that material is referable to P. dulcilacuum ( Markham, 2010: figs. 34, 35). Pseudostegias setoensis is now known from C. virescens in Hong Kong (see An et al., 2011) and Taiwan.