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Psammodontiformes
Psammodontidae is an extinct family of holocephalans (sometimes referred to as bradyodonts) known from the Carboniferous and Permian periods. It is the only family of the order Psammodontiformes. The order and family are named for the type genus, '' Psammodus'', and all members are believed to have been durophagous Durophagy is the eating behavior of animals that consume hard-shelled or exoskeleton-bearing organisms, such as corals, shelled mollusks, or crabs. It is mostly used to describe fish, but is also used when describing reptiles, including fossil t ... nektobenthic carnivores. The only described remains assigned to Psammodontidae are isolated tooth plates. References Holocephali Prehistoric cartilaginous fish families {{Paleo-holocephalan-stub Carboniferous first appearances Permian extinctions Carboniferous cartilaginous fish Permian cartilaginous fish Carboniferous fish of North America ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Holocephali
Holocephali (Sometimes spelled Holocephala; Romanization of Greek, Greek for "complete head" in reference to the fusion of Palatoquadrate, upper jaw with the rest of the skull) is a Subclass (biology), subclass of Chondrichthyes, cartilaginous fish. While the only living holocephalans are three families within a single Order (biology), order which together are commonly known as chimaeras, the group includes many extinct orders and was far more diverse during the Paleozoic and Mesozoic Era (geology), eras. The earliest known fossils of holocephalans date to the Middle Devonian period, and the group likely reached its peak diversity during the following Carboniferous period. Molecular clock studies suggest that the subclass diverged from its closest relatives, Elasmobranchii, elasmobranchs such as sharks and Batomorphi, rays, during the Early Devonian or Silurian period. Extinct holocephalans are typically divided into a number of orders, although the interrelationships of these gro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
