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Fossils of Asterotrtygon were found in Fossil Butte, Wyoming.. Before the description of Asterotrygon, Heliobatis was the only known stingray in the Green River Formation. . American paleontologist Othniel Charles Marsh named Heliobatis radians in 1877, and Xiphotrygon acutidens and Palaeodasybatis discus were subsequently named from the formation in 1879 and 1947, respecti
A diversity of stingray fossils is known from the Eocene Monte Bolca formation from Italy, including the early stingaree Arechia, as well as Dasyomyliobatis, which is thought to represent a transitional form between stingrays and eagle rays, and the highly unusual Lessiniabatis, which had an extremely short and slender tail with no sting.
Only three sedimentary beds bearing manta ray fossils are known, one from the Oligocene in South Carolina and two from the Miocene and Pliocene in North Carolina. [1] M. hynei is a fossil species dating to Early Pliocene North America. [18] Remains of an extinct species have been found in the Chandler Bridge Formation of South Carolina.
Cownose ray teeth and mouthparts. Stingray teeth consist of interlocking bars (dental plates) that crush food. The cownose ray exhibits a durophagous diet, meaning it feeds upon hard-shelled organisms, such as mollusks, crustaceans, but they prefer scallops or clams, which have softer shells and are categorized as bivalves. [2]
Early Eocene fossil stingray Heliobatis radians Giant devil ray, Mobula mobular. Eschmeyer's Catalog of Fishes classigies the rays as follows: [16] Order Torpediniformes. Family Platyrhinidae D. S. Jordan, 1923 (thornbacks or fanrays) Family Narkidae Fowler, 1934 (sleeper rays) Family Narcinidae, Gill, 1862 (electric rays) Family Hypnidae Gill ...
Fossils of these fishes have been found worldwide. [ 9 ] The extinct species Myliobatis dixoni is known from Tertiary deposits along the Atlantic seaboards of the United States , Brazil , Nigeria , England , and Germany .
The mouth cone ("everted pharynx") of a possible new species of Meiopriapulus, a marine worm in the Priapulida, bears pharyngeal teeth. [5] Fossils of the Yunnanozoon and Haikouella possess pharyngeal teeth. The lower pharyngeal bones of cichlids also carry specialized teeth which augment their normal mandibular teeth in the breakdown of food.
Acipenseriformes / æ s ɪ ˈ p ɛ n s ə r ɪ f ɔːr m iː z / is an order of basal [1] ray-finned fishes that includes living and fossil sturgeons and paddlefishes (Acipenseroidei), as well as the extinct families Chondrosteidae and Peipiaosteidae. [2] [3] [4] They are the second earliest diverging group of living ray-finned fish after the ...