Parabopyrella distincta, Shiino, 1837

An, Jianmei, Boyko, Christopher B. & Li, Xinzheng, 2015, A Review Of Bopyrids (Crustacea: Isopoda: Bopyridae) Parasitic On Caridean Shrimps (Crustacea: Decapoda: Caridea) From China, Bulletin of the American Museum of Natural History 2015 (399), pp. 1-85 : 50-52

Parabopyrella distincta (Nierstrasz and Brender à Brandis, 1923) Figure 14

Bopyrella distincta Nierstrasz and Brender à Brandis, 1923: 97, pl. 6, fig. 22 a–d [type locality: Pulau Kaniungan-Ketjil, Indonesia; infesting Synalpheus amboinae (Zehntner, 1984) = Synalpheus stimpsonii (de Man, 1888]; Chopra, 1927: 121–122, figs. 1–2 [Tamban, Tamil Nadu, India; infesting unidentified alpheid]; Shiino, 1936: 159; Shiino, 1939: 93; Shiino, 1949a: 49; Bourdon, 1980a: 205–208, fig. 9 [redescription of holotype].

Parabopyrella distincta: Markham, 1985a: 67 [transfer to Parabopyrella ]. —An, 2006: 82–83, fig. 37.

MATERIAL EXAMINED: Infesting Alpheus sp., 1 ♀ ( CIEAL 550001), 1 ♂ ( CIEAL 550002), 1955, Hainan Province, Qionghai Province.

DESCRIPTION: Female (CIEAL550001): Length 7.52 mm, maximal width 5.53 mm,

head width 2.19 mm, distorted 31 ° (fig. 14A, B).

Head fused with first pereomere, with anterolateral corner notch. Frontal lamina and eyes lacking (fig. 14A). Maxilliped (fig. 14C) with unarticulated setose palp. Barbula (fig. 14D) with two pairs of smooth falcate lateral projections on each side and shallow median indentation in center.

Pereon broadest across third pereomere (fig. 14A). Coxal plates rudimentary on short side, but well developed on first three pereomeres on long side. First three pereomeres of left side and only first pereomere of right side with dorsolateral bosses. Brood pouch completely open (fig. 14B). Oostegite 1 (fig. 14E, F) with two equally long articles, internal ridge bearing simple small projections, posterolateral point sharply directed laterally. Fifth oostegite much longer than other oostegites (fig. 14B). Pereopods of similar size, basis of each pereopod with carina (fig. 14G). Pleon of six pleomeres, bearing five pairs of biramous flaplike pleopods. Pleotelson medially incised, but rami distally round, uropods lacking.

DESCRIPTION: Male (CIEAL550002): Length 2.11 mm, maximal width (across pleon 1) 0.82 mm, head width 0.41 mm, pleonal length 0.26 mm. All pereomeres distinct (fig. 14H, I). Head ovate, anterior margin rounded, posterior margin curved (fig. 14H), black eyes near posterior margin (fig. 14H). Antenna of one article, antennule of three articles, both terminally setose (fig. 14J). Pereomeres sub‐ equal in width, lacking midventral projections (fig. 14I). Pereopods subequal in size, but dactyli of first five pairs larger than others, carpi of first pereopod rounded, others of elongate columnar form (fig. 14I). First three pleomeres distinct, with midventral tubercles. Last two pleomeres fused into single piece, but segments indicated by lateral indentations, without uropods (fig. 14H, I).

HOSTS AND LOCALITIES: Infesting Alpheus sp. (possibly more than one species), Synalpheus stimpsonii (de Man, 1888) (Alpheidae) , Hainan Province, Qionghai Province, China and Pulau, Indonesia, 11 m.

REMARKS: Nierstrasz and Brender à Brandis (1923) described Bopyrella distincta based on a single female collected by the Siboga-Expedition. Chopra (1927) reported on a pair of specimens from southeast India and described the male for the first time. Bourdon (1980a) redescribed and figured the female holotype specimen, incorrectly citing the host as Synalpheus ambonicae (sic). Markham (1985a) reviewed Bopyrella , and transferred this species to Parabopyrella . The present specimens are therefore only the third female and second male to be reported. The female conforms well to the holotype, but differ in some minor characters, such as the pleon of the present female not fused medially, and the posterolateral point of oostegite 1 more elongate and directed laterally.

Figures

Fig. 14. Parabopyrella distincta (Nierstrasz and Brender á Brandis, 1923), reference female (CIEAL550001) (A–G): A. Dorsal view. B. Ventral view. C. Left maxilliped, external view. D. Left side of barbula. E. Left oostegite 1, external view. F. Left oostegite 1, internal view. G. Right pereopod 7. Reference male (CIEAL550002) (H–J): H. Dorsal view. I. Ventral view. J. Right antennae and antennule. Scale: 2 mm (A, B); 1 mm (E, F); 0.5 mm (C, D, H, I, G); 0.25 mm (J).