Apogon, Lacepede, 1801

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 : 425

Apogon sp.

(Figures 77–81)

Material: 22 specimens in total. Anda1 (1) RGM 962254; Anda2 (4) RGM 962255 , RGM 962256 ; Anda3 (3) RGM 962258 ; Anda4 (5) RGM 962259 ; AndaDeVos (1) RGM 962260 ; Roxas (7) RGM 962261 , RGM 962262 , RGM 962263 , RGM 962333 ; Tiep2 (1) RGM 962264 .

Four juvenile (OL:OH= 1.49–1.56) and one larger specimen (OL:OH= 1.41) are depicted. Ventral rim regularly bent; in the more adult specimen the anterior part of the ventral rim is more strongly bent than the posterior part. Dorsal rim irregular with undulations and a predorsal angle; in the juvenile specimens a middorsal angle dominates. The ventral part of the inner surface is convex, the dorsal part makes a more flat impression, also due to the distinct round-oval dorsal depression. The sulcus is wide and large, the straight cauda is more narrow and shorter than the ostium. A distinct crista inferior aligns the cauda, but not the ostium. A small but clear dorsal depression is present above the collum. An insignificant ventral furrow is observed in the juvenile specimens, while the more adult specimen is too eroded for proper evaluation of this aspect. The ornamentation of the outer surface varies between specimens from almost smooth via a few anterior lobes to fully decorated with knobs and furrows along the dorsal and ventral rim (in the smallest specimen).

Overall, the specimens belong to Apogon or its related genus Fowleria , but it is not possible to decide whether this presents a rather variable species of Apogon or whether two groups have to be discriminated. Species identification requires better preserved adult specimens.