Athelges takanoshimensis Ishii, 1914

An, Jianmei, Williams, Jason D. & Yu, Haiyan, 2011, Three abdominal parasitic isopods (Isopoda: Epicaridea: Bopyridae: Athelginae) on hermit crabs from China and Hong Kong, Journal of Natural History 45 (47 - 48), pp. 2901-2913 : 2902-2904

Athelges takanoshimensis Ishii, 1914

( Figure 1 )

Abbreviated synonymy (see Markham 2009, for complete synonymy before 2009).

Athelges takanoshimensis Ishii, 1914: 519–530 , pl. 7 (type locality Takanoshima, Tokyo Bay, Japan; infesting Eupagurus geminatus McLaughlin ). Markham 2009: 229–233, fig.5.

Material examined

Infesting Pagurus pectinatus (Stimpson) . Bohai Sea, Stn 1098, 38 ◦ 40 ′ N, 121 ◦ 15 ′ E, 51.5 m, 17 July 1959, Chen coll., 1 ♀, CIEA109801 , 1 ♂, CIEA109802 . Yellow Sea , Stn 2023, 38 ◦ 40 ′ N, 121 ◦ 55 ′ E, 49 m, 13 July 1959, Jiang coll., 1 ♀, CIEA202301 , 1 ♂, CIEA202302 . Yellow Sea , Stn 2006, 38 ◦ 45 ′ N, 121 ◦ 45 ′ E, 51 m, 21 October 1959, Huang coll., 1 ♀, CIEA200601 , 1 ♂, CIEA200602 . Bohai Sea , Stn 1035, 39 ◦ 00 ′ N, 120 ◦ 50 ′ E, 52.5 m, 17 July 1959, Jiang coll., 1 ♀, CIEA103501 , 1 ♂, CIEA103502 . Yellow Sea , Stn 2023, 38 ◦ 40 ′ N, 121 ◦ 55 ′ E, 50 m, 21 October 1959, Jiang coll., 1 ♀, CIEA202303 , 1 ♂, CIEA202304 . Yellow Sea , Stn 2023, 38 ◦ 40 ′ N, 121 ◦ 55 ′ E, 50 m, 21 October 1959, Jiang coll., 1 ♀, CIEA202305 .

Infesting Pagurus minutus Hess. Hong Kong, Discovery Bay, Lantau Island, 22 ◦ 18 ′ 0.74 ′′ N, 114 ◦ 1 ′ 0.84 ′′ E, 9 June 2001, J. Williams coll., 10 ♀, 10 ♂, USNM1155301 .

Remarks

This species has been reported several times from Hong Kong ( Markham 1982, 1990; 1992), Zhejiang ( Wei 1991), Taiwan ( Boyko 2004), Korea ( Kim and Kwon 1988b), Singapore ( Markham 2009) and Japan ( Ishii 1914; Shiino 1934, 1936) and the present specimens closely match those described previously ( Figure 1 ). However, the maxilliped of the specimens from China lacks a palp ( Figure 1E ) and in this character more closely resembles Markham’s (1982) description based on Hong Kong specimens.

Prevalence

In total, 5.5% (87 of 1571) of hermit crabs collected from Hong Kong between 2001 and 2004 were parasitized by A. takanoshimensis . In this region, the parasite was only recorded from Pagurus minutus . The reproduction and ecology of A. takanoshimensis from Hong Kong is the subject of a separate paper (Williams, in preparation).

Range and hosts

Japan: on Pagurus dubius (Ortmann) ( Saito et al. 2000) , Pagurus maculosus Komai and Imafuku ( Nagasawa et al. 1996), Pagurus japonicus (Stimpson) ( Shiino 1934) , Pagurus pectinatus (Stimpson) ( Shiino 1937) and Pagurus samuelis (Stimpson) ( Ishii 1914) ( P. samuelis is a synonym of Eupagurus geminatus ); Zhejiang, China: on Pagurus sp. ( Wei 1991) ; Bohai Sea, China: on Pagurus pectinatus (herein); Hong Kong: on Clibanarius sp. , Diogenes edwardsii (De Haan) , Diogenes sp. , Pagurus aff. geminatus McLaughlin , Pagurus trigonocheirus (Stimpson) ( Markham 1982) and Pagurus minutus (herein); Korea: on Pagurus brachiomastus (Thallwitz) , Pagurus dubius , Pagurus filholi (de Man) , Pagurus middendorffii Brandt , and Pagurus pectinatus ( Kim and Kwon 1988b) ; Taiwan: on Pagurodofleinia doederleini (Doflein) ( Boyko 2004) ; Singapore: on Diogenes pallescens Whitelegge ( Markham 2009) .

Figures

Figure 1. Athelges takanoshimensis Ishii, 1914. (A–H) Female (CIEA109801): (A) dorsal view; (B) ventral view; (C) left antennule and antennae; (D) left side of barbula; (E) left maxilliped, external view; (F) left oostegite 1, external view; (G) left oostegite 1, internal view; (H) right pereopod 5. (I–M) Male (CIEA109802): (I) Dorsal view; (J) ventral view; (K) left antennule and antennae; (L) left pereopod 3; (M) left pereopod 7. Scale bars: 1 mm for A, B; 0.08 mm for C, K, M, L; 0.38 mm for D; 0.33 mm for E; 0.50 mm for F, G; 0.14 mm for H; 0.28 mm for I, J.