It is found in the western central Pacific ocean.

It can reach a maximum length of 4.5 centimetres.

Blennies in this species feed primarily off of plants, including benthic algae and weeds.

[2] Its specific name honours Norman S. Portenoy of Bethesda, Maryland for his support of the ichthyological expeditions of the National Museum of Natural History.

This Blenniidae article is a stub.