The Smallfin worm-eel (Pseudomyrophis micropinna, also known as the Plain worm eelCommon names of Pseudomyrophis micropinna at www.fishbase.org.) is an eel in the family Ophichthidae (worm/snake eels).Pseudomyrophis micropinna at www.fishbase.org. It was described by Charles Barkley Wade in 1946.Wade, C. B., 1946 (16 Dec.) [ref. 4542] Two new genera and five new species of apodal fishes from the eastern Pacific. Allan Hancock Pacific Expedition 1932-40, Los Angeles v. 9 (no. 7): 181-213, Pls. 24-28. It is a marine, tropical eel which is known from the eastern central and southeastern Pacific Ocean, including Nicaragua, Colombia, Panama and Costa Rica.Pseudomyrophis micropinna at the IUCN redlist. It dwells at a depth range of , and inhabits sediments of mud. Males can reach a maximum total length of .

Due to its wide distribution, lack of known threats, and lack of observed population decline, the IUCN redlist currently lists the Smallfin worm-eel as Least Concern.

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