Thrissina encrasicholoides (Actinopterygii: Clupeiformes: Engraulidae): first record from Taiwan and northernmost record of the species

Harutaka Hata,Koeda Keita

doi:10.3750/aiep/02753

Abstract

Although four species of the engraulid genus Thrissina (often regarded as Thryssa) have previously been recorded from waters around Taiwan, Thrissina encrasicholoides (Bleeker, 1852), known from the eastern Indian and western Pacific Oceans (north to the Philippines), has not been to date. However, two specimens (100.1 and 100.6 mm standard length) of T. encrasicholoides were collected from south-western Taiwan. Their morphology and fresh coloration are described, the former being largely consistent with previous descriptions of the species: short maxilla, its posterior tip blunt, slightly beyond anterior margin of preopercle; 14 or 17 keeled scutes; and one scute weakly developed and lacking a ventral edge projection, immediately behind the isthmus. The specimens represent the first record of the species from Taiwanese waters and the northernmost record of the species.

Highlights

MATERIALS AND METHODSThrissina Jordan et Seale, 1925, an Indo-Pacific genus Counts and proportional measurements followed Hata of marine and/or brackish water anchovies (Engraulidae), and Motomura (2017)
The Taiwanese specimens were assignable to the Thrissina baelama (Forsskål, 1775), in sharing fewer (four genus Thrissina, defined by Whitehead et al (1988) and to nine) prepelvic scutes and a short upper jaw
Wongratana et al (1999) as having strongly tip not beyond anterior margin of preopercle), the latter keeled prepelvic- and postpelvic scutes on the ventral is characterized by a lack of scutes immediately behind edge, a spine-like scute on the dorsal-fin origin, dorsal the isthmus and the posterior tip of the maxilla pointed and anal fins with 14, and 30–33 rays, respectively, the

Summary

Introduction

Thrissina Jordan et Seale, 1925, an Indo-Pacific genus Counts and proportional measurements followed Hata of marine and/or brackish water anchovies (Engraulidae), and Motomura (2017). Scales on lateral surface of body with of anal-fin base, slightly concave at caudal peduncle. One scute weakly developed, lacking ventral edge fin ray, slightly anterior to middle of body.

Results

Conclusion