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Prognathodon was first described by Louis Dollo in 1889 based on specimens gathered in Belgium.There is some confusion over the correct generic name for the taxon. Dollo first mentioned the taxon as "Prognathodon" in some preliminary notes and provided a provisional diagnosis, but replaced the name Prognathodon with "Prognathosaurus" and used Prognathosaurus in all of his subsequent papers ...
Prognathodon currii There is only one named species of Clidastes that is valid, C. propython . Clidastes iguanavus Cope, 1868 was the original type species, but the ICZN was petitioned to make C. propython the new type species by virtue of that species being based on diagnostic remains, which it did vis-à-vis Opinion 1750 (1993).
The genus contains a single species, G. stadtmani, considered a species of the related Prognathodon up until its 2020 redescription. [2] It was a large mosasaur measuring 10.5 metres (34 ft) long. [3] Gnathomortis was originally named as a species of Prognathodon in 1999. [3]
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Thalassotitan ("titan of the seas") is an extinct genus of large mosasaurs (a group of extinct marine lizards) that lived during the late Maastrichtian of the Cretaceous period in what is now Morocco, around 67 to 66 million years ago.
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Fishes are a paraphyletic group and for this reason, the class Pisces seen in older reference works is no longer used in formal taxonomy.Traditional classification divides fish into three extant classes (Agnatha, Chondrichthyes, and Osteichthyes), and with extinct forms sometimes classified within those groups, sometimes as their own classes: [1]
The USDA promoted eight basic food groups prior to 1943, then seven basic food groups until 1956, then four food groups. A food pyramid was introduced in 1992, then MyPyramid in 2005, followed by MyPlate in 2011. Dietary guidelines were introduced in 2015 and slated to be rereleased every five years.