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Otodus chubutensis, [1] meaning "ear-shaped tooth of Chubut", from Ancient Greek ὠτ (ōt, meaning "ear") and ὀδούς (odoús, meaning "tooth") – thus, "ear-shaped tooth", is an extinct species of prehistoric megatoothed sharks in the genus Otodus, that lived during Oligocene, Miocene, and Pliocene, in ~28–5.3 milions years ago. [2]
Scientists determined that Otodus evolved into the genus Carcharocles, given substantial fossil evidence in the form of transitional teeth. [ 6 ] [ 7 ] Some teeth have been excavated from the sediments of the Nanjemoy Formation in Maryland, USA, Ypres clay in Belgium, and western Kazakhstan , which are morphologically very similar to Otodus ...
The complete Otodus obliquus to C. megalodon transition then became clear and has since gained the acceptance of many other experts with the passage of time. Within the Carcharocles lineage, C. angustidens is the species succeeding C. sokolovi and is followed by C. chubutensis. [4]
Lateral cusplets were finally lost in a gradual process that took roughly 12 million years during the transition between C. chubutensis and C. megalodon. [31] The genus was proposed by D. S. Jordan and H. Hannibal in 1923 to contain C. auriculatus. In the 1980s, megalodon was assigned to Carcharocles.
A study on changes in the presence or absence of lateral cusplets on teeth of members of the genus Carcharocles from the Calvert, Choptank, and St. Marys formations, and on their implications for the transition of shark populations from these formations from a Carcharocles chubutensis-dominated population to one dominated by C. megalodon, is ...
Over 80 teeth from a species of carnivorous carcharodontosaurid dinosaur, Tyrannotitan chubutensis, were also recovered from the site. One of the titanosaur tail vertebrae bore marks that could have been made by Tyrannotitan chubutensis, either through scavenging or hunting.
Otodontidae is an extinct family of sharks belonging to the order Lamniformes.Its members have been described as megatoothed sharks. [1] [2] They lived from the Early Cretaceous to the Pliocene, and included genera such as Otodus, including the giant megalodon. [3]
Carcharocles sokolovi Carcharocles sokolowi Jaekel, 1895 ( sic ) Otodus sokolovi [ 2 ] is an extinct species or chronospecies of large shark in the family Otodontidae which may represent a transitional chronospecies between Otodus auriculatus and Otodus angustidens . [ 3 ]