Bopyrinella parameces, An & Boyko & Li, 2015

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 : 35-37

Bopyrinella parameces , n. sp.

Figure 8

Bopyrinella paramecia An, 2006: 76–77 , fig. 33 (unavailable name).

MATERIAL EXAMINED: Infesting Ogyrides orientalis (Stimpson, 1860) . Holotype ♀ ( CIEOG501201 ), allotype ♂ ( CIEOG501202 ), Huiquan Bay, Qingdao , Shandong Province, 120 ° 20′E, 36 ° 00′N, 10 December 1950.

DESCRIPTION: Holotype female (CIEOG 501201): Length 5.66 mm, maximal width 2.41 mm, head length 0.67 mm, head width 0.69 mm, pereon length 2.15 mm, pleon length 2.88 mm (fig. 8A, B).

Body width about 1/3 length, pereon length subequal to pleon length, flattened, calceiform, slightly distorted. Head oval, without frontal lamina, fused with first pereomere medially, eyes lacking (fig. 8A). Antennule reduced to single article, antenna lacking (fig. 8B). Maxilliped without palp (fig. 8C), spur blunt and short. Barbula (fig. 8D) with two pairs of smooth projections on each side, flattened near center.

Pereomeres distinct, broadest across third and fourth pereomeres (fig. 8A). Narrow coxal plates on left side of all pereomeres, right side only on first pereomere. Dorsolateral bosses on first four pereomeres of left side, and only first pereomere of right side. Brood pouch widely open (fig. 8B), oostegite 1 almost symmetrical except for posterolateral point (fig. 8B, E, F), small and depressed anterior article, large posterior article. Internal ridge smooth, posterolateral point rounded. Other four pairs of oostegites small, triangular (fig. 8B). All pereopods subequal in size and structure (fig. 8G), carpi and meri smooth, bases of all pereopods stout. Pleon of six pleomeres, elongated, first pleomere identifiable from dorsal suture, other pleomeres detected only from lateral indentations. Five pairs of uniramous flaplike pleopods, posteriorly becoming smaller (fig. 8B). Sixth pleomere indented posteromedially, uropods lacking (fig. 8B).

DESCRIPTION: Allotype male (CIEOG501 202): Length 0.87 mm, maximal width (across pereon 3) 0.29 mm, head width 0.18 mm, head length 0.14 mm. All pereon segments distinct, pleomere distinct in dorsal view (fig. 8H, I). Head elliptical, fused with first pereomere (fig. 8H), eyes absent (fig. 8H). Antennule of three articles, antenna of four articles, terminally nonsetose (fig. 8I). Pereomeres subequal in width, midventral projections lacking (fig. 8H). All pereopods small, posteriorly becoming slightly larger (fig. 8I). Pleon sharply narrow, pleomeres distinct only on dorsal surface, no pleopods or uropods (fig. 8I).

ETYMOLOGY: The specific name, parameces , refers to the female’ s long elliptical, calceiform, outline.

HOST AND LOCALITY: Infesting Ogyrides orientalis (Stimpson, 1860) (Ogyrididae) , Shan‐ dong Province, China.

REMARKS: The present specimens agree with three of the other species of Bopyrinella in having (1) female with relatively long body outline, (2) only oostegite 1 well developed and different in shape on left and right sides, (3) brood pouch completely open, (4) five pairs of flaplike uniramous pleopods and lacking uropods. The fourth species, B. albida , has rudimentary sixth and seventh oostegites, a character state that was surprisingly not emphasized by Shiino (1958) or Markham (1985b) as this was the first recorded species in Bopyrinae bearing seven pairs of oostegites. Previously reported hosts of Bopyrinella species are from Hippolytidae and Alpheidae , but the present host is in Ogyrididae . All three families, however, belong to Alpheoidea. The only other bopyrid known to infest a species in Ogyrididae is Ogyridione caroliniana Markham, 1988 , which is not at all similar to the new species. Bopyrinella parameces , n. sp., is most related to Bopyrinella albida Shiino, 1958 , but can be distinguished from it by (1) the new species lacks a frontal lamina ( B. albida with large frontal lamina), (2) the body of the new species is only slightly distorted ( B. albida with body highly distorted), (3) the oostegite 1 of the new species differ only slightly from each other in shape ( B. albida with very different oostegite 1), (4) the new species has only five pairs of oostegites ( B. albida with seven pairs), (5) the new species with only one pair of antennae (antennule) ( B. albida with antennule and antennae), (6) male of the new species without pleopods ( B. albida with tubercular pleopods), and (7) the new species lacks eyes ( B. albida with eye spots).

Figures

Fig. 8. Bopyrinella parameces n. sp., holotype female (CIEOG501201) (A–G): A. Dorsal view. B. Ventral view. C. Right maxilliped, external view. D. Right side of barbula. E. Right oostegite 1, external view. F. Right oostegite 1, internal view. G. Right pereopod 2. Allotype male (CIEOG501202) (H, I): H. Dorsal view. I. Ventral view. Scale: 2 mm (A, B); 1 mm (E, F); 0.5 mm (C, D, G–I).