Bopyrissa kensleyi ( Williams & Schuerlein, 2005 ) Williams & Boyko & Madad, 2019

Williams, Jason D., Boyko, Christopher B. & Madad, Asma Z., 2019, Branchial parasitic isopods (Crustacea: Isopoda: Bopyridae: Pseudioninae) of hermit crabs (Crustacea: Decapoda: Diogenidae) from the western Pacific, with descriptions of a new genus and three new species, Raffles Bulletin of Zoology 67, pp. 83-118 : 96

Bopyrissa kensleyi ( Williams & Schuerlein, 2005) , new combination

(Fig. 6)

Pseudione kensleyi Williams & Schuerlein, 2005: 96 , 103–106, figs. 7–9 [ Singapore; infesting Clibanarius infraspinatus (Hilgendorf, 1869) ]; Madad, 2008: 548 [mention]; Markham, 2009: 232 [list]; McDermott et al., 2010: 9 [list]; Bruce & Wong, 2015: 162 [list].

Material examined. Singapore: 1 sinistral mature ♀ (8.0 mm) ( ZRC 2018.0830 ) from left branchial chamber of ♂ Clibanarius infraspinatus (6.3 mm SL), Changi, Sta. CP 1, coll. Toh Chay Hoon, 26 July 2013 .

Type locality. Noordin Beach , Pulau Ubin , Singapore, Johore Strait , South China Sea ( Williams & Schuerlein, 2005) .

Distribution. Singapore ( Williams & Schuerlein, 2005; herein).

Hosts. Clibanarius infraspinatus (Hilgendorf, 1869) ( Williams & Schuerlein, 2005; herein).

Size range (length). Females to 8.0 mm, males to 1.5 mm.

Remarks. This is the second record of this species, from the same host and general vicinity ( Singapore) as the type specimens. The female morphology corresponds to the original description (Fig. 6A–C). The uropods of the holotype are asymmetrical (one being bifurcated) and were recognised as being abnormal when the species was described; the present female has normally-developed uropods (Fig. 6B, C). The species was originally placed in Pseudione because the lateral plates of the fifth pleomere did not overlap the sixth pleomere but discovery of this specimen with a normally developed posterior end shows that the species belongs in Bopyrissa with the sixth pleomere (pleotelson) being ventrally displaced and not visible in dorsal view. Within Bopyrissa , the species is most similar to B. pyriforma but differs in symmetry of the female (sinistral in B. kensleyi , new combination vs. dextral in B. pyriforma ), development of the dorsolateral bosses (large on pereomeres 1–4 on both sides of the body in B. kensleyi , new combination vs. large on pereomeres 1–4 only on one side of the body in B. pyriforma ), form of the barbula (elongate lateral lobe with medial multi-lobed projection in B. kensleyi , new combination vs. single elongate lateral lobe in B. pyriforma ), shape of the distal lobe of oostegite 1 (more elongate and recurved in B. kensleyi , new combination vs. B. pyriforma ), and the degree of protrusion of the anal cone of the male (strong in B. kensleyi , new combination vs. not protruded in B. pyriforma ).