Peristedion, Lacepede, 1801

Ono, Makoto & Kawai, Toshio, 2014, Review of Armored Searobins of the Genus Peristedion (Teleostei: Peristediidae) in Japanese Waters, Species Diversity 19, pp. 117-131 : 129

Key to Japanese species of the genus Peristedion

1. Rostral projection spatulate ( Fig. 3B ); anterior edge of fourth sensory pore of rostral projection posterior to anterior edge of premaxilla ( Fig. 2B ) ........ P.liorhynchus

– Rostral projection triangular ( Fig. 3A, C, D ); anterior edge of fourth sensory pore of rostral projection anterior to anterior edge of premaxilla ( Fig. 2A, C, D ) ....... 2

2. Branches on filamentous barbel 13–20; total chin barbels 13–16; perifacial rim smooth and straight ( Fig. 2A ) ...................................................................... P. orientale

– Branches on filamentous barbel 21–34; total chin barbels 17–26; perifacial rim prominent starting near anterior margin of lower jaw ( Fig. 2C, D ) .......................... 3

3. Rostral projection broadly triangular with straight margin on medial side at base ( Fig. 2C ); rostral projection width 12.1–13.3% HL ......................... P. amblygenys

– Rostral projection narrowly triangular with rounded margin on medial side at base ( Fig. 2D ); rostral projection width 8.6–12.3% HL .............................. P. nierstraszi

Figures

Fig. 3. Dorsal view of head of Japanese species of Peristedion. A, Peristedion orientale, HUMZ 188920, 143mm SL; B, Peristedion liorhynchus, HUMZ 80306, 187mm SL; C, Peristedion amblygenys, HUMZ 188916, 134mm SL; D, Peristedion nierstraszi, BSKU 689, 133mm SL.

Fig. 2. Ventral view of head of Japanese species of Peristedion. A, Peristedion orientale, HUMZ 188920, 143mm SL; B, Peristedion liorhynchus, HUMZ 80306, 187mm SL; C, Peristedion amblygenys, HUMZ 188916, 134mm SL; D, Peristedion nierstraszi, BSKU 689, 133mm SL. Solid triangle points to rounded margin. Open triangle points to straight margin. Shaded areas indicate prominent perifacial rim. Barbels omitted.