Argeia, Pingi Yu, 1935

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 : 19-20

Argeia sp.

Figure 2

Argeia atlantica: An, 2006: 63–64 ; An et al., 2008: 226; An, 2011: 133–134, fig. 5-4 (not Argeia atlantica Markham,1977 ).

MATERIAL EXAMINED: Infesting Crangon affinis De Haan, 1849 , ♀ ( CIECR 979401), ♂ ( CIECR 979402), Yellow Sea, Stn. 9794, 123 ° 30′E, 35 ° 30′N, 9 January 2004.

DESCRIPTION: Female (CIECR979401): Length 10.04 mm, pereon length 4.46 mm, maximal width 7.92 mm, head length 0.92 mm, head width 2.31 mm (fig. 2A).

All segments distinct except median regions of pleomeres 1 and 2. Anterior edge of head deeply bilobate, frontal lamina extending beyond head (fig. 2A); eyes lacking. Antennule and antenna of three and five articles, respectively, terminally setose. Maxilliped (fig. 2B) with setose palp, sharp plectron. Barbula with two pairs of simple falcate lateral projections on each side.

Pereon broadest across third pereomere (fig. 2A). Coxal plates, dorsolateral bosses and tergal projections enlarged on first four pereomeres. Tergal projections of pereomeres 3 and 4 acute and posteriorly directed. Brood pouch open. Oostegite 1 with nearly smooth internal ridge, without posterolateral point, posterior margin with setae. Posterior pereopods larger than anterior pairs, ischia without tubercles.

Pleon of six pleomeres, first five bearing lateral plates with serrated margins and uniramous smooth pleopods. Sixth pleomere without lateral plates, with uniramous uropods.

DESCRIPTION: Male (CIECR979402): Len‐ gth 2.0 mm, maximal width (across pereomere 4) 0.65 mm, head width 0.41 mm, head length 0.16 mm, pleonal length 0.62 mm. Head elliptical, separated from first pereomere; eyes present. Antennule and antennae of three and four articles, respectively. Pereomere segements distinct, subequal in width, midventral projections lacking. Pereopods subequal in size and shape. Pleon fused into single ovate piece, pleopods and uropods lacking.

REMARKS: The female specimen differs from typical A. pugettensis in that it has the ischium of each pereopod without any large tubercular swelling and the lateral plates of the pleon have serrated margins. The male is not obviously different from those of A. pugettensis . Earlier records of these specimens (An, 2006, 2011; An et al., 2008) identified the specimens as A. atlantica . Aside from the geographical distance between China and the western Atlantic, the Chinese specimens do not match A. atlantica as females of that species do not have serrated lateral plates and the head is flat (the head of the Chinese specimen, like those of A. pugettensis , is bilobed). Because this female lacks swellings on the ischia and has serrated lateral plates, it may represent an undescribed species. However, as it might also be an aberrant specimen of A. pugettensis , more material is needed for study.

Figures

Fig. 2. Argeia sp., female (CIECR979401) (A–B): A. Dorsal view. B. Right maxilliped, external view. Scale: 1 mm (A); 0.5 mm (B).