Netuma bilineata

Johari, Adibah, Kocsis, László, Roslim, Amajida & Haziq, Ilman, 2025, Otolith morphometric analysis of North Bornean Ariidae (Siluriformes): new insights and taxonomic implications, Zootaxa 5660 (4), pp. 451-474 : 462

Netuma bilineata (n= 24) ( Fig. 6 , Supplementary data 7)

Like H. sagor , the curvature of most of the otoliths’ margin making them appear circular. Although, the outermost part of their mesial margin is quite irregular, especially along the postero-mesial margin. Some of them (n= 8) have prominent Md, which causes a sharp slant that makes them appear “swollen” at the postero-mesial margin. They have prominent Amp and the majority of them (n= 19) bear tubular straight Sl, while the remaining ones (n= 5) have compact straight Sl. They have prominent mesial notch and their ILb is shallow.

Figures

FIGURE 6. Left lapilli otolith of ariid taxa with elongated and rounded otolith. Lapillus 1 is elongated, and lapilli 2 to 6 are rounded. 1: Osteogeneiosus militaris; 2: Hexanematichthys sagor; 3: Netuma bilineata; 4: Netuma thalassina; 5: Plicofollis argyropleuron; 6: Plicofollis nella, a: Ventral view; b: Dorsal view; c: Mesial view, Scale bar: 1mm.