The Japanese seahorse (in Japanese, kitano-umi-uma and sangotatsu) or lemur-tail seahorse (Hippocampus mohnikei) is a species of fish in the Syngnathidae family. The Japanese seahorse reaches a maximum length of 8.0 cm, is usually dark brown and has a relatively long tail, a ridgelike coronet and flattened spines. Many seahorse species look similar, so in addition to any distinguishing features, individual specimens are identified using a series of specific measurements and counts of anatomical features such as spines and tail rings.