Hulettia

Hulettia is an extinct genus of ray-finned fish known from United States. This fish genus contains two species, H. americana and H. hawesi.

Species
The type species, H. americana is originally described as a species of Pholidophorus in 1899. In 1984, its own genus name Hulettia is given, after Hulett, Wyoming. Holotype is known from Sundance Formation of South Dakota, while other specimens are also known from Wanakah (Summerville) Formation, Todilto Formation and Ralston Creek Formation.

Second species, H. hawesi is described from Morrison Formation of Colorado. This species is named after William Hawes who found the holotype.

H. americana reached their maximum standard length (excluding fins) of 15.5 cm, while H. hawesi is much smaller, with standard length of 5.85 cm (about 7.2 cm total length).

Classification
At 1984, it was classified as Halecostomi incertae sedis. Later study shows that is likely a member of Neopterygii, pan-holostean.

Paleoecology
Formations that H. americana known are considered as marine environment, while Morrison Formation where H. hawesi described shows freshwater environment. Discovered specimens show evidence of predation upon the smaller species of fish Todiltia.