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Placoderms (from Greek πλάξ (plax, plakos) 'plate' and δέρμα (derma) 'skin') [1] are vertebrate animals of the class Placodermi, an extinct group of prehistoric fish known from Paleozoic fossils during the Silurian and the Devonian periods.
Pterichthyodes is a genus of antiarch placoderm fishes from the Devonian period. Its fossils have been discovered in Scotland. [1] They were one of the first species recognized for what they were, as their fossils are common in the Old Red Sandstone formation studied by geologists in the early 19th century.
Various placoderm species, including the famous Dunkleosteus. This list of placoderms is an attempt to create a comprehensive listing of all genera from the fossil record that have ever been considered to be members of the class Placodermi. This list excludes purely vernacular terms.
Fossils of Dunkleosteus are frequently found with boluses of fish bones, semidigested and partially eaten remains of other fish. [51] As a result, the fossil record indicates it may have routinely regurgitated prey bones rather than digest them. Mature individuals probably inhabited deep sea locations, like other placoderms, living in shallow ...
In contrast, the long-nosed Rolfosteus measured just 15 cm. [2] Fossils of Incisoscutum have been found containing unborn fetuses, indicating that arthrodires gave birth to live young. [3] [4] A common misconception is the arthrodires (along with all other placoderms) were sluggish bottom-dwellers that were outcompeted by more advanced fish.
B. tungseni from China Fossil fish slab, cast. Late Devonian, Mandagery Sandstone, Canowindra, New South Wales . Preserves 114 fish individuals, which died when their freshwater pond dried up. Most of the individuals in the slab are the antiarch placoderms Remigolepis walkeri and Bothriolepis yeungae.
Dinichthys (from Greek: δεινός deinós, 'terrible' and Greek: ἰχθύς ichthys 'fish') is an extinct monospecific genus of large marine arthrodire placoderm from the Late Devonian (Famennian stage) measuring around 3 metres (9.8 ft) long. [1] Fossils were recovered from the Ohio Shale Formation along the Olentangy River in Delaware ...
Fossil fish slab, cast. Late Devonian, Mandagery Sandstone, Canowindra, New South Wales ().Preserves 114 fish individuals, which died when their freshwater pond dried up. Most of the individuals in the slab are the antiarch placoderms Remigolepis walkeri and Bothriolepis yeunga