Definition of Osteostracans. Meaning of Osteostracans. Synonyms of Osteostracans

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

Definition of Osteostracans

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Meaning of Osteostracans from wikipedia

- from the Middle Silurian to Late Devonian. Anatomically speaking, the osteostracans, especially the Devonian species, were among the most advanced of all...
- Cephalaspidomorphs are a group of jawless fishes named for Cephalaspis of the osteostracans. Most biologists regard this taxon as extinct, but the name is sometimes...
- Cephalaspis sensu stricto was the sister-taxon of cornuate osteostracans, i.e., all osteostracans that either have, or have ancestors that had defined corners...
- most do have a dorsal or a caudal fin. Some fossil agnathans, such as osteostracans and pituriaspids, did have paired fins, a trait inherited in their jawed...
- displacement, and sound. The presence of these extrinsic grains in osteostracans, chondrichthyans, and acanthodians indicates a common inner ear physiology...
- Zenaspidida is an extinct order of osteostracans, a group of jawless stem-gnathostomes. They possessed a distinct headshield, which varied in width to...
- ostracoderms. Most fossil agnathans, such as galeaspids, thelodonts, and osteostracans, are more closely related to vertebrates with jaws (called gnathostomes)...
- Keating, Joseph N.; Sansom, Robert S.; Purnell, Mark A. (2012). "A new osteostracan fauna from the Devonian of the Welsh Borderlands and observations on...
- point of their evolution. Most of the ostracoderms, such as thelodonts, osteostracans and galeaspids, were more closely related to the gnathostomes than to...
- Placoderms also share certain anatomical features only with the jawless osteostracans; because of this, the theory that placoderms are the sister group of...