Definition of Psammosteids. Meaning of Psammosteids. Synonyms of Psammosteids

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

Definition of Psammosteids

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Meaning of Psammosteids from wikipedia

- psammosteids include Psammosteus, and Obruchevia, two genera of enormous species with dorsal shields around one meter in diameter. The Psammosteids were...
- anchipteraspidids are diagnostic of pteraspidids, and not of cyathaspidids. The psammosteids are a group of pteraspidiforms that forms the sister taxon of Protopteraspididae...
- Pycnosteus Mark-Kurik, E; Obruchev, D (1968). "ON THE EVOLUTION OF THE PSAMMOSTEIDS (HETEROSTRACI)". Eesti NSV Teaduste Akadeemia Toimetised. Keemia. Geoloogia...
- besides the tail or caudal fin. In some pteraspids, especially in the psammosteids, the ends of the branchial plates (the plates that covered the gills)...
- paleoichthyology where she produced her 1955 dissertation: ‘Devonian psammosteids (Agnatha) of the Tartu and Gauja Stages in Estonian SSR'. During this...
- and pteraspidid species were applied to psammosteids, but proved not to be useful. At the time, psammosteids were not well characterized morphologically...
- to those of psammosteids. Because of these two traits, species of this genus were originally described as being North American psammosteids closely related...
- Pteraspididae, Gigantaspis and Protaspididae), and the anchipteraspidids and the Psammosteids. Protopteraspids are found in Lower Devonian marine strata of the Western...
- Intact specimens of Weigeltaspis suggest a living animal similar to psammosteids like Drepanaspis. The armor of Phialaspis symmondsi (once considered...
- (and best) known genus, Drepanaspis from the Hunsrück lagerstätte. The Psammosteids were the only heterostracans that survived the Upper Frasnian extinction...