Definition of Heterostracans. Meaning of Heterostracans. Synonyms of Heterostracans

Here you will find one or more explanations in English for the word Heterostracans. Also in the bottom left of the page several parts of wikipedia pages related to the word Heterostracans and, of course, Heterostracans synonyms and on the right images related to the word Heterostracans.

Definition of Heterostracans

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Meaning of Heterostracans from wikipedia

- Devonian. The heterostracans differed from other Paleozoic agnathan taxa both in the arrangement and histology of their scales. Most heterostracans had two...
- groups, the more primitive heterostracans and the cephalaspids. The cephalaspids were more advanced than the heterostracans in that they had lateral stabilizers...
- or begin. Some experts regard it as being descended from the basal heterostracans of the Silurian. Haaramo, Mikko (2007). "†Pteraspidomorphi". Mikko's...
- by a small fin web. This tail structure clearly differs from that of heterostracans, which are currently grouped with arandaspids and astraspids in the...
- ventral plate forming the edges of the mouth suggest that pteraspidiform heterostracans were filter-feeders that selectively filtered specific sized plankton...
- skeleton, they were first regarded as heterostracans. Now, we know that they are widely different from heterostracans, in particular in retaining about ten...
- Drepanaspis from the Hunsrück lagerstätte. The Psammosteids were the only heterostracans that survived the Upper Frasnian extinction event during the Late Devonian...
- Rhinopteraspis is an extinct genus of pteraspidid heterostracan agnathan. "Rhinopteraspis cornubica (McCoy), with notes on the classification and evolution...
- Protaspis is an extinct genus of pteraspidid heterostracan agnathan which lived during the Early Devonian of the United States, with fossils found in...
- Poraspis is an extinct genus of heterostracan. Fossils are found in Late Silurian and Early Devonian marine strata of Norway, Canada and the United States...