About: Placoderm

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About: Placoderm Sponge Permalink

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Placodermi (from the Greek πλάξ = plate and δέρμα = skin, literally "plate-skinned") is an extinct group of paraphyletic armored prehistoric "fish" (Which are also paraphyletic, hence being in quotes.) , known from fossils, which lived from the Silurian to the end of the Devonian period, being done in by mass extinctions. Their head and thorax were covered by articulated armored plates and the rest of the body was scaled or naked, depending on the species. Placoderms were among the first jawed fish; their jaws likely evolved from the first of their gill arches. Placoderms are paraphyletic, and comprise several distinct outgroups or sister taxa to all living jawed vertebrates, which originated among their ranks. This is illustrated by a 419 MYA fossil, Entelognathus, from China, which is th

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rdfs:label	Placoderm
rdfs:comment	Placodermi (from the Greek πλάξ = plate and δέρμα = skin, literally "plate-skinned") is an extinct group of paraphyletic armored prehistoric "fish" (Which are also paraphyletic, hence being in quotes.) , known from fossils, which lived from the Silurian to the end of the Devonian period, being done in by mass extinctions. Their head and thorax were covered by articulated armored plates and the rest of the body was scaled or naked, depending on the species. Placoderms were among the first jawed fish; their jaws likely evolved from the first of their gill arches. Placoderms are paraphyletic, and comprise several distinct outgroups or sister taxa to all living jawed vertebrates, which originated among their ranks. This is illustrated by a 419 MYA fossil, Entelognathus, from China, which is th
dcterms:subject	Carnivores Carnivores Sea Monsters Sea Monsters Paleozoic animals Paleozoic animals Devonian Animals Devonian Animals
abstract	Placodermi (from the Greek πλάξ = plate and δέρμα = skin, literally "plate-skinned") is an extinct group of paraphyletic armored prehistoric "fish" (Which are also paraphyletic, hence being in quotes.) , known from fossils, which lived from the Silurian to the end of the Devonian period, being done in by mass extinctions. Their head and thorax were covered by articulated armored plates and the rest of the body was scaled or naked, depending on the species. Placoderms were among the first jawed fish; their jaws likely evolved from the first of their gill arches. Placoderms are paraphyletic, and comprise several distinct outgroups or sister taxa to all living jawed vertebrates, which originated among their ranks. This is illustrated by a 419 MYA fossil, Entelognathus, from China, which is the only known placoderm with a type of bony jaw like that found in modern bony fishes. This includes a dentary bone, which is found in humans and other tetrapods. Placoderms were also the first fish to develop pelvic fins, the precursor to hindlimbs in tetrapods, as well as true teeth. 380 MYA fossils of three other genera, Incistoscutum, Materpiscis and Austroptyctodus, represent the oldest known example of live birth.

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