H. sindonis Jordan & Snyder 1901

English common names. Sindo’s Seahorse, Shiho’s seahorse. Synonyms. None.

Holotype. USNM 47930.

Type locality. Totomi Bay, off Hamamatsu, Japan.

Distribution. Japan.

Notes. Genetic data (714bp, 12S rRNA) from specimens identified by Mukai et al. (2000) as H. coronatus from Sagami Bay, Japan, separated into two distinct clades that differed by 4.4–4.6%. Photographs from that same paper, however, appear to be H. sindonis and H. coronatus, which would explain the observed genetic divergence.