Owstonia nigromarginatus Fourmanoir, 1985

(Figures 94–97)

1999 Sphenanthias nigromarginatus Rivaton J, Bourret P, pag 322–323, plate 152, fig. 9–10

Material: 6 specimens in total. Anda1 (1) RGM 962273; Anda2 (3) RGM 962274, RGM 962275, RGM 962276; Roxas (2) RGM 962277, RGM 962278 .

Oval-elongated Cepola -like otoliths (OL:OH=1.68–1.95) with a bluntly pointed anterior end and a roundedoblique posterior end. The sulcus is sigmoid with a large ostium of which 60% is covered by a colliculum and a small cauda that is separated from the ostium by an almost similar sized collum. The inner surface of the larger specimen is convex but with a clear dorsal depression. The outer surface is smooth and flat in the center with a feeble depression at the anterior side; close to the rims the surface becomes convex.

The inner surface is more convex than that in the extant Cepola macrophthalma (Linnaeus, 1758) and two other Owstonia species (formely Sphenanthias) species (sp. 1 and sp. 2) depicted by Rivaton & Bourret (1999).