Carcharhinus cf. amblyrhynchos ( Bleeker, 1856 )

Jirapatrasilp, Parin, Cuny, Gilles, Kocsis, László, Sutcharit, Chirasak, Ngamnisai, Nom, Charoentitirat, Thasinee, Kumpitak, Satapat & Suraprasit, Kantapon, 2024, Mid-Holocene marine faunas from the Bangkok Clay deposits in Nakhon Nayok, the Central Plain of Thailand, ZooKeys 1202, pp. 1-110 : 1-110

Carcharhinus cf. amblyrhynchos ( Bleeker, 1856)

Fig. 18 F – J

cf. Carcharias (Prionodon) amblyrhynchos Bleeker, 1856: 467 – 468 . Type locality: Java Sea near Solombo Island.

cf. Carcharhinus amblyrhynchos . Compagno 1984: 459 – 461, with in-text figs. Krajangdara et al. 2022: 49, with in-text figs.

Referred material.

CUF - NKNY - S 3 - 10 (Fig. 18 F – J ) (1 upper tooth).

Description.

The crown of CUF - NKNY - S 3 - 10 displays a rather narrow main cusp with well-developed heels. The main cusp is regularly serrated, with an almost straight mesial edge and a distal one that is slightly concave. It is thus inclined distally. The labial side of the main cusp is nearly flat, whereas the lingual one is convex. Both the mesial and distal heels of the crown are poorly preserved and their serration pattern cannot thus be observed. The base of the root is concave and the nutritive groove on the bulged lingual face is poorly developed or heavily worn. The labial face of the root is nearly flat.

Habitat.

Continental and insular shelves and adjacent oceanic waters ( Compagno 1984).

Distribution.

Indo-western to Central Pacific ( Compagno 1984).

Record in Thailand.

Gulf of Thailand and Andaman Sea ( Compagno 1984; Krajangdara et al. 2022).

Taxonomic remarks and comparisons.

The general shape of the crown, the regular serration of the main cusp, and the arched root are reminiscent of C. amblyrhynchos ( Bass et al. 1973; Garrick 1982; Kocsis et al. 2019; Malyshkina et al. 2023), but the poorly preserved heels of the teeth make a definite identification difficult to ascertain.

Figures

Figure 18. Carcharhinid shark teeth A – E Carcharhinus cf. amblyrhynchoides, specimen CUF - NKNY - S 3 - 2 in A lingual B labial C mesial D distal and E apical views F – J Carcharhinus cf. amblyrhynchos, specimen CUF - NKNY - S 3 - 10 in F lingual G labial H mesial I distal and J apical views.