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Protopteraspididae is an extinct family of … Protopteraspididae is an extinct family of pteraspidid heterostracan agnathans. Fossils of the various genera are found in early Devonian-aged marine strata. Protopteraspidids were once thought to represent a taxon of basal pteraspidids (hence "proto") but recent evaluations demonstrate that Protopteraspididae is a paraphyletic group of various transitional forms representing a gradual transition between the more advanced (comprising Pteraspididae, and Protaspididae), and the anchipteraspidids and the Psammosteids.he anchipteraspidids and the Psammosteids.
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*Protopteraspis
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| rdfs:comment |
Protopteraspididae is an extinct family of … Protopteraspididae is an extinct family of pteraspidid heterostracan agnathans. Fossils of the various genera are found in early Devonian-aged marine strata. Protopteraspidids were once thought to represent a taxon of basal pteraspidids (hence "proto") but recent evaluations demonstrate that Protopteraspididae is a paraphyletic group of various transitional forms representing a gradual transition between the more advanced (comprising Pteraspididae, and Protaspididae), and the anchipteraspidids and the Psammosteids.he anchipteraspidids and the Psammosteids.
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Protopteraspididae
|
