Length type refers to Height (= from top of coronet to the tip of straightened tail). This species is mainly found in pairs (Ref. 48635) on coral reefs, sponge gardens, kelp, and floating Sargassum. Nocturnal, site faithful. Ovoviviparous (Ref. 205). The male carries the eggs in a brood pouch which is found under the tail (Ref. 205). Life span probably more than 2-3 years. Used for traditional Chinese medicine.