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The invertebrates of Arkansas's Cretaceous sea included clams, echinoids, oysters, and snails. [4] During the Cretaceous, Arkansas was home to Belemnitella, Exogyra, Ostrea, Turritella, and other marine invertebrates in the Arkadelphia area of Clark County. [1] Fish of the same age left behind teeth in the area near Saratoga in Hempstead County.
This list of the prehistoric life of Arkansas contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Arkansas. Precambrian [ edit ]
This list of the Paleozoic life of Arkansas contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Arkansas and are between 541 and 252.17 million years of age.
Fishes of Arkansas. Fayetteville, Arkansas: The University of Arkansas Press. ISBN 1-55728-001-0. "Aquatic Fish Report" (PDF). Arkansas Wildlife Action Plan. Little Rock: Arkansas Game and Fish Commission. 2015
The study of prehistoric fish is called paleoichthyology. A few living forms, such as the coelacanth are also referred to as prehistoric fish, or even living fossils, due to their current rarity and similarity to extinct forms. Fish which have become recently extinct are not usually referred to as prehistoric fish.
Myledaphus remains have been found both in marine and fluvial (freshwater) deposits, suggesting it could tolerate a range of salinity. [7] In the Hell Creek Formation , composed predominantly of floodplain and riverine deposits, Myledaphus teeth are very common, accounting for a significant fraction of vertebrate remains found in microsites.
Turseodus is an extinct genus of ray-finned fish found in Late Triassic freshwater sediments of the United States. [ 2 ] [ 3 ] Two species have been described, T. acutus from the Lockatong Formation ( Carnian stage ) of Pennsylvania , and T. dolorensis from the Chinle Formation ( Norian stage) of Colorado .
They are small freshwater fish found in the dark environments of caves (underground lakes, pools, rivers and streams), springs and swamps in the eastern half of the United States. Like other troglobites , most amblyopsids exhibit adaptations to these dark environments, including the lack of functional eyes and the absence of pigmentation .