Pseudomegachasma
Extinct genus of sharks From Wikipedia, the free encyclopedia
Pseudomegachasma ("false megamouth") is an extinct genus of filter-feeding shark that was closely related to the modern sand tiger shark. It is known from Cretaceous strata in Russia and the United States, and is the only known planktivorous odontaspid, as well as the oldest known planktivorous elasmobranch. It most likely derived from its closest relative, the piscivorous shark Johnlongia. As its name suggests, it was originally classified under Megachasma, before it was found to be an odontaspid.[1]
| Pseudomegachasma Temporal range: | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Chondrichthyes |
| Subclass: | Elasmobranchii |
| Order: | Lamniformes |
| Family: | Odontaspididae |
| Subfamily: | †Johnlonginae |
| Genus: | †Pseudomegachasma Shimada, 2015 |
| Species | |
|
P. casei | |
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