Owstonia nigromarginatus Fourmanoir, 1985

Van Hinsbergh, Victor W. M. & Helwerda, Renate A., 2019, Fish Otoliths from the Cabarruyan Piacenzian-Gelasian fauna found in the Philippines, Zootaxa 4563 (3), pp. 401-443 : 429

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).