Thrissina baelama (Fabricius, 1775)

Hata, Harutaka, Mandagi, Ixchel F. & Masengi, Kawilarang W. A., 2023, Resurrection of nominal species previously regarded as junior synonyms of Thrissina baelama (Fabricius, 1775) and their re-descriptions (Teleostei: Clupeiformes: Engraulidae), Raffles Bulletin of Zoology 71, pp. 279-302 : 282

Key to species previously identified as Thrissina baelama by Whitehead et al. (1988)

Note: Thrissina baelama sensu Whitehead et al. (1988) was diagnosed by a short maxilla posteriorly not reaching the preopercle posterior margin, and total ventral scutes fewer than 18 and ending anteriorly below the pectoral fin ( Fig. 1 ).

1. 1TGR ≤ 36 ........................... T. samam ( Japan to New Guinea)

– 1TGR ≥ 38 (36–40 in T. baelama ) ........................................2

2. Several distinct black blotches on anterior part of dorsal fin .. ........................................................ T. tuberculosa ( Mauritius)

– Distinct blotches on dorsal fin absent.....................................3

3. 1TGR 41 or more .................................................................... .... T. polynemoides (eastern coast of Africa and Madagascar)

– 1TGR 40 or less......................................................................4

4. Pre-dorsal-fin length greater than 50.6% of SL; snout longer than 4.9% of SL ........................ T. evermanni ( Fiji to Tonga)

– Pre-dorsal-fin length shorter than 50.4% of SL; snout shorter than 4.8% of SL .................................... T. baelama (Red Sea)

Figures

Fig. 1. A–D, Diagnostic characters of species previously identified as Thrissina baelama [A, lateral view of whole body, B, head (yellow line indicates posterior part of maxilla; blue line and broken lines indicate anterior and posterior margins of preopercle, respectively), C, first and second supramaxillae (left-right inverted), D, ventral view of isthmus (no scutes located anterior to pectoral fins)] and E, ventral view of isthmus of Thrissina encrasicholoides (scutes located anterior to pectoral fins) (A: fresh condition, 72.9 mm SL, Sulawesi, Indonesia; B–D: T. samam, NSMT-P 144842, 58.4 mm SL, Ryukyu Archipelago, Japan; E: T. encrasicholoides, NSMT-P 50306, 69.8 mm SL, Philippines) (B–E, alizarin stain).