Trichiuridae, Rafinesque, 1810

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

Trichiuridae indet.

Fig. 31

Referred material.

CUF - NKNY - 2.1 (Fig. 31 A – F ), CUF - NKNY - 2.2 (Fig. 31 G – K ), CUF - NKNY - 18.2 (Fig. 31 L – P ) (3 teeth).

Description.

Labiolingually flattened teeth seem to thin out at their mesial edge. They are covered with elongated and fine striation. This striation becomes coarser basally and distally on the more elongated specimens (specimens CUF - NKNY - 2.1 and CUF - NKNY - 2.2). The latter two teeth are strongly curved distally with a concave distal edge and the more completely preserved specimen CUF - NKNY - 2.1 bears an apical barb. The specimen CUF - NKNY - 18.2 has a curved mesial margin, whereas the distal one is vertical and straight.

Taxonomic remarks and comparisons.

The two strongly curved teeth (specimens CUF - NKNY - 2.1 and CUF - NKNY - 2.2) represent fang-like features from the front of the jaw, while the specimen CUF - NKNY - 18.2 comes from a rather distal position. This latter tooth resembles somewhat the lateral teeth of Sphyranea (barracuda, e. g., Gottfried et al. 2017), but those are more symmetrical. The global species database (Fishbase: www. fishbase. org) reports twenty-seven cutlassfishes from the wider region of South and Southeast Asia ( Froese and Pauly 2024). Two common genera, Trichurus and Lepuracanthus, contain some species that bear such barbed fang-like teeth ( Nakamura and Parin 1993; 1998).

Order incertae sedis in Eupercaria Betancur-R. et al., 2014

Figures

Figure 31. Trichiuridae indet. A – F specimen CUF - NKNY - 2.1, anterior tooth in A, B lateral C anterior D posterior and E apical views F close-up of the tip of the tooth G – K specimen CUF - NKNY - 2.2, anterior tooth in G, H lateral I anterior J posterior and K apical views L – P specimen CUF - NKNY - 18.2, lateral tooth in L, M lateral N anterior O posterior and P apical views.