Two new species of Thrissina (Clupeiformes: Engraulidae) from the northern Indian Ocean and redescription of Thrissina vitrirostris (Gilchrist and Thompson 1908)

Redescription of the specimen of <i>Thrissina dussumieri</i> (Teleostei: Clupeiformes: Engraulidae), collected from the Ogasawara Islands

“…Counts and proportional measurements, expressed as percentages of standard length (SL), followed Hata and Motomura (2019). All measurements were made with digital calipers to the nearest 0.01 mm.…”

“…Only two Thrissina species, T. dussumieri and Thrissina setirostris (Broussonet, 1782), have a relatively long maxilla extending posteriorly well beyond the lowermost point of the pectoral-fin insertion (Wongratana 1983(Wongratana , 1987Whitehead et al 1988;Wongratana et al 1999;Hata and Motomura 2019;Hata et al 2020). However, T. dussumieri is easily distinguished from T. setirostris by having the lower jaw posterior end not steeply elevated (steeply elevated in T. setirostris), a shorter maxilla, its posterior tip reaching at least halfway between the pectoral fin tip and the pelvicfin insertion and sometimes reaching to pelvic-fin insertion in adults (reaching at least to the pectoral fin tip, often to the pelvic-fin insertion and sometimes to the anal-fin origin), first gill arch with 17-19 (vs. 10-12) gill rakers on lower limb, and prepelvic and postpelvic scutes numbering 14−16+6−9=21−24 (vs. 16−18+9 or 10=25−28) (Wongratana 1983;Whitehead et al 1988;Wongratana et al 1999).…”

“…However, T. dussumieri is easily distinguished from T. setirostris by having the lower jaw posterior end not steeply elevated (steeply elevated in T. setirostris), a shorter maxilla, its posterior tip reaching at least halfway between the pectoral fin tip and the pelvicfin insertion and sometimes reaching to pelvic-fin insertion in adults (reaching at least to the pectoral fin tip, often to the pelvic-fin insertion and sometimes to the anal-fin origin), first gill arch with 17-19 (vs. 10-12) gill rakers on lower limb, and prepelvic and postpelvic scutes numbering 14−16+6−9=21−24 (vs. 16−18+9 or 10=25−28) (Wongratana 1983;Whitehead et al 1988;Wongratana et al 1999). Although Fowler (1941) and Whitehead (1972) regarded Thrissina adelae (Rutter, 1897) as a junior synonym of T. dussumieri, the former can be easily distinguished from T. dussumieri by its shorter maxilla (reaching slightly beyond the lowermost point of the pectoral-fin insertion), the first gill arch with 20-23 lower gill rakers, and the prepelvic and postpelvic scutes numbering 17 or 18+8−11=25−28 (Whitehead et al 1988;Hata and Motomura 2019). Fowler (1928) reported T. dussumieri (as Engraulis dussumieri) from the Ogasawara Islands, based on a specimen obtained by W. Stimpson and deposited in USNM.…”

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

“…Thrissina Jordan et Seale, 1925, an Indo-Pacific genus of marine and/or brackish water anchovies (Engraulidae), comprises 26 valid species (Whitehead et al 1988, Wongratana et al 1999, Kottelat 2013, Hata and Motomura 2019. Although the genus has long been treated as Thryssa Cuvier, 1829 (e.g., Whitehead et al 1988;Wongratana et al 1999), Kottelat (2013) pointed out that Thryssa was an incorrect subsequent spelling of Thrissa, and gave precedence to Thrissina over other available names for the genus.…”

A New Species of Thrissina from the Andaman Sea and Re-assessment of the Taxonomic Status of Thrissina cuvierii (Swainson, 1839) and Thrissina malabarica (Bloch, 1795) (Teleostei: Clupeiformes: Engraulidae: Coiliinae)

“…Thrissina , a widely distributed Indo-West Pacific genus, comprises 34 valid species (Roberts, 1978; Wongratana, 1983, 1987; Whitehead et al, 1988; Wongratana et al, 1999; Gill et al, 2018; Hata and Motomura, 2019; Hata and Nakae, 2019; Hata, 2020, 2022; Hata and Koeda, 2020, 2021; Hata et al, 2020, 2021, 2022, 2023). Among them, an Indian Ocean species with a distinctly deep body has been treated as Thrissina malabarica (Bloch, 1795; e.g., Nair, 1953; Misra, 1976; Whitehead et al, 1988; Psomadakis et al, 2015).…”