Hulettia

Hulettia
Temporal range: Callovian–Tithonian
Type specimen
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Actinopterygii
Subclass: Neopterygii
Genus: †Hulettia
Patterson, 1984
Type species
Hulettia americana
Eastman, 1899
Other species
  • †H. hawesi Kirkland, 1997

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.[1] 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.[2][3]

Second species, H. hawesi is described from Morrison Formation of Colorado. This species is named after William Hawes who found the holotype.[4]

H. americana reached their maximum standard length (excluding fins) of 15.5 centimetres (6.1 in), while H. hawesi is much smaller, with standard length of 5.85 centimetres (2.30 in) (about 7.2 centimetres (2.8 in) total length).[2][4]

Classification

At 1984, it was classified as Halecostomi incertae sedis.[2] Later study shows that is likely a member of Neopterygii, pan-holostean.[5]

Paleoecology

Formations that H. americana known are considered as marine environment,[3] while Morrison Formation where H. hawesi described shows freshwater environment.[4] Discovered specimens show evidence of predation upon the smaller species of fish Todiltia.[6]

See also

References

  1. ^ [1] C. R. Eastman. 1899. Jurassic fishes from Black Hills of South Dakota. Geological Society America Bulletin 10:397-408 9/22/14
  2. ^ a b c Schaeffer, Bobb; Schaeffer, Bobb; Patterson, Colin (1984). Jurassic fishes from the western United States, with comments on Jurassic fish distribution. New York, N.Y: American Museum of Natural History.
  3. ^ a b Kirkland, D. W.; Denison, R. E.; Evans, R. (1995). Middle Jurassic Todilto Formation of northern New Mexico and southwestern Colorado: Marine or nonmarine?. New Mexico Bureau of Geology and Mineral Resources. doi:10.58799/b-147.
  4. ^ a b c Kirkland, James I. (1998). "Morrison fishes". Modern Geology. 22: 503–533.
  5. ^ Near, Thomas J.; Thacker, Christine E. (2024-04-18). "Phylogenetic Classification of Living and Fossil Ray-Finned Fishes (Actinopterygii)" (PDF). Bulletin of the Peabody Museum of Natural History. 65 (1). doi:10.3374/014.065.0101. ISSN 0079-032X.
  6. ^ http://nmnaturalhistory.org/hulettia.html Archived 2014-09-08 at the Wayback Machine New Mexico Museum of Natural History, 1999