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Hulettia
''Hulettia'' is an extinct genus of prehistoric bony fish found in the Morrison Formation in the western United States, measuring approximately three to four inches in length. This fish genus contains one species, ''H. americana''. Its body was covered in thick prominent scales, and its name is based on Hulett, Wyoming, a locale which is near the Morrison Formation. Discovered specimens show evidence of predation upon the smaller species of fish Todiltia that inhabited the Jurassic Lake Todilto, and another specimen discovered in the Bathonian coastal sandstone, in the Sundance Formation of South Dakota. Both specimens are complete skeletons with no fragmentary remains or dubious anomalies amongst the bones recovered.〔http://fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=212144 C. R. Eastman. 1899. Jurassic fishes from Black Hills of South Dakota. Geological Society America Bulletin 10:397-408 9/22/14〕
==Paleobiology==
It lived in an ecological niche similar to minnows and other small forage fish. The most noticeable quality of the ''Hulettia'' is its extremely durable and compact scales, providing protection from lepidophagy, external parasites and predation by fish which could not swallow it whole.〔http://earthphysicsteaching.homestead.com/Jurassic_Fossil_Fish.html Hulettia; Guadalupe County〕 It prominently fed upon smaller fish, shrimp and other crustaceans, gastropods, worms and aquatic insect nymphs. Its mouth was lined with short tiny teeth that could scrape algae and other plant matter from solid surfaces, suggesting that it was an opportunistic forager that didn't solely depend on ingesting smaller creatures.〔http://nmnaturalhistory.org/hulettia.html New Mexico Museum of Natural History,
1999〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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