Onychocepon harpax Pérez, 1921

Boyko, Christopher B. & Williams, Jason D., 2024, New records of bopyrid parasites (Crustacea, Isopoda, Epicaridea) of pea crabs (Crustacea, Decapoda, Pinnotheridae) with descriptions of two new species of Rhopalione Pérez, 1921 and a review of the genus, Zoosystema 46 (7), pp. 149-175 : 156

Onychocepon harpax Pérez, 1921

( Fig. 3 )

Onychocepon harpax Pérez, 1921: 59-61 , figs 1, 2 [ ex Pinnotheres palaensis Bürger, 1895 (now Arcotheres palaensis (Bürger, 1895)) , Ambon, Indonesia]. — Perkins 1925: 182 [mention]. — Shiino 1936b: 164 [comparison with other species in the genus]. — Wells & Wells 1966: 56 [mention]. — Danforth 1972: 170, 172 [comparison with other species in the genus]. — McDermott 2009: 792, table 2 [list]. — Williams et al. 2023: 532 [list].

“bopyrid” – Ng & Ahyong 2022: 148, 167, fig. 12F [ex ZRC 2018.762; specimens examined herein].

“unidentified bopyrids” [of Arcotheres palaensis (in part)] – Williams et al. 2023: 533 [list].

MATERIAL EXAMINED. — Indonesia • 1 ovigerous ♀ (5.1 mm TL), 1 mature ♂ (3.6 mm TL), from right side of pleon of female Arcotheres palaensis (Bürger, 1895) (7.2 mm CL, 11.3 mm CW; ZRC 2018.0762), ex Anadara antiquata (Linnaeus, 1758) ( Arcidae Lamarck, 1809 ); Lombok, Teluk Kodek; 12.XI.2013; S. Dwiono leg.; ZRC 2023.0258.

REMARKS

This is only the second record of O. harpax , also from Indonesia. It agrees with the description of Pérez (1921) for all male and female characters ( Figure 3 with illustration of female parts); the female bears uniramous uropods, a character not specified by Pérez (1921).

Figures

FIG. 3. — Onychocepon harpax Pérez, 1921, ZRC 2023.0258 (A-K): A, female, dorsal view; B, male, dorsal view; C, male, ventral view (arrows indicate attached ciliates); D, left antennule of female; E, left antenna of female; F, left maxilliped and barbular lobes of female; G, left oostegite 1 of female, outer view; H, left oostegite 1 of female, inner view, asterisk shows lobe drawn in close-up;I, close-up of lobe from inner ridge of oostegite 1 of female; J, left pereopod 1 of female; K, left pereopod 7 of female. Scale bars: A, 2 mm; B, C, 1 mm; D, E, I-K, 50 µm; F-H, 200 µm.