Symmorium
Template:Short description Template:Speciesbox
Symmorium is an extinct symmoriiform cartilaginous fish from the Devonian and Carboniferous of the United States (Illinois)[1][2] and Russia.[3] The type species, Symmorium reniforme, was named by Edward Drinker Cope in 1893,[4] with other species assigned to the genus having since been reclassified into other genera such as Petalodus. Symmorium bears close similarity in size and appearance to Stethacanthus[5] but lacks the "spine-brush complex" in place of the first dorsal fin.[6] Some paleontologists think that the two forms represented the males and females of related species, while other scientists think they were distinct genera.[6][7]
References
<templatestyles src="Reflist/styles.css" />
- ↑ E. D. Cope. 1894. New and little known Paleozoic and Mesozoic fishes. Journal of the Academy of Natural Sciences Philadelphia (Series 2) 9:427-448
- ↑ M. E. Williams. 1985. The "Cladodont level" sharks of the Pennsylvanian black shales of central North America. Palaeontographica Abteilung A 190:83-158
- ↑ A. Ivanov. 1999. Late Devonian - Early Permian chondrichthyans of the Russian Arctic. Acta Palaeontologica Polonica 49(3):267-285
- ↑ E. D. Cope. 1893. On Symmorium, and the position of cladodont sharks. American Naturalist 27:999-1001
- ↑ Script error: No such module "citation/CS1".
- ↑ a b M. Ginter, O. Hampe, and C. J. Duffin. 2010. Chondrichthyes, Paleozoic Elasmobranchii: Teeth. In H.P. Schultze (ed.), Handbook of Paleoichthyology 3D:1-168
- ↑ Script error: No such module "Citation/CS1".
Script error: No such module "Check for unknown parameters".