Stenopus pyrsonotus is a shrimp-like decapod crustacean belonging to the infraorder Stenopodidea, native to the Indo-West Pacific region.

The rostrum, eyestalk and carapace are pinkish-white, while the third maxillipeds, and the coxa, basis, ischia and mer joints of the pereiopods are translucent pink.

[4][5] Stenopus pyrsonotus occurs in the tropical Indo-West Pacific region, where it has been found in the Hawaiian archipelago and Mauritius.

It is a benthic, cryptic species, and is found in coral reef systems, typically in crevices, in caves and under overhangs.

[5] Several specimens of Stenopus pyrsonotus were found in close proximity to a yellow-edged moray eel (Gymnothorax flavimarginatus), and it may be that this shrimp enters into a cleaning symbiosis with certain fish, as do several other members of its genus; this theory is supported by the showy white antennules and pincers, with which it may signal its availability.