Meiacanthus atrodorsalis, the forktail blenny, is a species of combtooth blenny found in coral reefs in the western Pacific ocean.

This species grows to a length of 11 centimetres (4.3 in) TL.

This venomous species can also be found in the aquarium trade.

It is also known as the eyelash harptail-blenny, poison-fang blenny or the yellowtail poison-fang blenny.

This Blenniidae article is a stub.