Dysomma opisthoproctus is an eel in the family Synaphobranchidae (cutthroat eels).Dysomma opisthoproctus at www.fishbase.org. It was described by Chen Yu-Yun and Michael Hin-Kiu Mok in 1995.Chen, Y.-Y. and H.-K. Mok, 1995 (21 Dec.) [ref. 21892] Dysomma opisthoproctus, a new synaphobranchid eel (Pisces: Synaphobranchidae) from the northeastern coast of Taiwan. Copeia 1995 (no. 4): 927-931. It is a subtropical, marine eel which is known only from northeastern Taiwan, in the northwestern Pacific Ocean. It is known to dwell at a maximum depth of 200 metres. Males are known to reach a total length of 42.1 centimetres.
The species epithet "opisthoproctus" refers to the posterior position of the anus, on the eel.
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