Plagiotremus rhinorhynchos, commonly called the bluestriped fangblenny, is a species of combtooth blenny found in coral reefs in the Pacific and Indian Ocean.

The fangblenny is a specialised mimic of juvenile bluestreak cleaner wrasse.

Its opioid-containing venom helps it escape, as it gives a pain-free bite which also dulls the host's reactions.

[citation needed] They are known for being aggressive and feed on skin, mucus and sometimes other fish scales.

The fall in the host's blood pressure makes it lose co-ordination, just as a human feels dizzy when blood pressure is low, giving the fangblenny time to escape.