长肩鳃鳚（学名：Omobranchus elongatus），又名狗鲦，为鳚科肩鳃鳚属下的一个种。

Omobranchus elongatus, the cloister blenny or chevroned blenny, is a species of combtooth blenny found in coral reefs in the western Pacific and Indian oceans. This species can reach a length of 5 centimetres (2.0 in) SL. This species can also be found in the aquarium trade.