Parabopyrella cuspidata, 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 : 48-50

Parabopyrella cuspidata , n. sp. Figure 13

Parabopyrella cuspidatus An, 2006: 85–86 , fig. 40 (unavailable name).

MATERIAL EXAMINED: Infesting Alpheus digitalis De Haan, 1844 , holotype ♀ ( CIEAL 560301), allotype ♂ ( CIEAL 560302), Haimen, Jiangsu Province, 121 ° 15′E, 31 ° 54′N, 12–14 March 1956, coll. Ruiyu Liu and Zhengang Fan.

DESCRIPTION: Holotype female ( CIEAL 560301 ): Length 9.24 mm, maximal width 5.53 mm, head length 2.06 mm, head width 2.1 mm, distorted 22 ° (fig. 13A, B).

Head fused with first pereomere except in anterolateral corners, obscure posterior margin sharply curved and anterior margin of head irregular. Small black eyes near posterior margin of head (fig. 13A). Antennule of three articles, antenna of five articles. Maxilliped articulated with triangular palp laterally fringed with setae (fig. 13C, D). Barbula with two pairs of short falcate lateral projections on each side (fig. 13E).

Pereon broadest across third pereomere (fig. 13A). Pereomeres 2–5 medially fused. Coxal plates well developed on left side of all pereomeres and on right side of first four pereomeres. Round dorsolateral bosses on first four pereomeres. Brood pouch widely open (fig. 13B). Oostegite 1 (fig. 13F, G) with two articles, internal ridge bearing small simple projections, posterolateral point directed straight backward, distal portion of posterior edge fringed with setae. Posterior pereopods slightly larger (fig. 13H, I), carpi and meri smooth, dactyli short, bases of all pereopods produced into lobes. Pleon of six pleomeres, segments indicated by dorsal sutures and deep lateral indentations (fig. 13A), first five bearing biramous flaplike pleopods (fig. 13B), sixth pleomere incised medially, uropods lacking (fig. 13B).

DESCRIPTION: Allotype male (CIEAL56 0302): Length 2.20 mm, maximal width across pereomere 4 0.82 mm, head width 0.47 mm, head length 0.28 mm. All segments distinct (fig. 13J, K). Head elliptical with curved posterior edge (fig. 13J), large black eyes near posterior margin of head (fig. 13J). Antennule of three articles with setae on distal article, antenna of one article, terminally smooth (fig. 13L). Pereomeres widest across fourth pereomere, lacking midventral projections (fig. 13K). All pereopods of similar size and structure, dactyli sharp but short (fig. 13M). Pleon of six distinct segments, without midventral projections, pleopods or uropods (fig. 13K). Sixth pleomere produced into two extend subacute lobes with medioventral anal cone (fig. 13K).

ETYMOLOGY: The specific name, cuspidata , refers to the head of the female having a sharply curved posterior margin and an irregular anterior margin.

HOST AND LOCALITY: Infesting Alpheus digitalis De Haan, 1844 (Alpheidae) , Jiangsu Province, China.

REMARKS: The new species belongs to the “C1” group with a medially incised pleotelson and can be distinguished from the other four species of the “C1” group by characters of oostegite 1, maxilliped, and the posterior margin of the head. The male of the new species differs from those of all other Parabopyrella species by the characters given below in (4). Parabopyrella cuspidata , n. sp., is most closely related to P. barnardi , but (1) the female of the new species bears a pleon with dorsal sutures and deep indentations on both sides (the female of P. barnardi has the pleon fused dorsally and with only the left side deeply indented), (2) the maxilliped of the new species has a triangular palp ( P. barnardi with cylindrical palp), (3) the posterolateral point of oostegite 1 of the new species is sharp and backwardly directed (that of P. barnardi round and laterally directed), (4) the male of the new species has distinct pleomeres and laterally separated lobes on the pleotelson (male of P. barnardi with fused pleomeres and rounded pleotelson).

Figures

Fig. 13. Parabopyrella cuspidata, n. sp., holotype female (CIEAL560301) (A–I): A. Dorsal view. B. Ventral view. C. Left maxilliped, external view. D. Palp of maxilliped, internal view. E. Left side of barbula. F. Left oostegite 1, external view. G. Left oostegite 1, internal view. H. Right pereopod 2. I. Right pereopod 6. Allotype male (CIEAL560302) (J–M): J. Dorsal view. K. Ventral view. L. Right antennae and antennule. M. Left pereopod 7. Scale: 2 mm (A, B); 0.5 mm (C, E–G); 0.25 mm (D, H–K); 0.15 mm (L, M).