Hemicyclaspis

Hemicyclaspis

Taxobox
name = "Hemicyclaspis"
fossil_range = Early Devonian



regnum = Animalia
phylum = Chordata
classis = Agnatha
ordo = Cephalaspidomorphi
genus = "Hemicyclaspis"

"Hemicyclaspis" is an extinct genus of primitive jawless fish, closely related to "Cephalaspis", that lived in the Devonian period in what is now Europe and North America.

A typical cephalaspid, "Hemicyclaspis" had a heavily armored, shovel-shaped headshield. It is thought to have been a better swimmer than most of its relatives because of its powerful tail, stabilizing dorsal fin and the keel-shaped hydrodynamic edges of its head shield. "Hemicyclaspis" probably foraged the ocean floor for food.


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • Hemicyclaspis —   Hemicyclaspis Rango temporal: Silúrico Superior, Devónico Inferior …   Wikipedia Español

  • ДАУНТОНСКИЙ ЯРУС — [по замку Даунтон в Уэлсе, Англия], Lapworth, 1879, первоначально рассматривался как в. ярус силурийской системы и включал от л., залегающие выше слоев с граптолитами слои Вайтклиф, Лудлов бон и песчаники замка Даунтон. В дальнейшем Кинг (King,… …   Геологическая энциклопедия

  • Prehistoric fish — are various groups of fishes that lived before recorded history. A few, such as the coelacanth still exist today and are considered living fossils.The first fish and the first vertebrates, were the ostracoderms, which appeared in the Cambrian… …   Wikipedia

  • List of prehistoric jawless fish — This list of prehistoric jawless fish is an attempt to create a comprehensive listing of all genera from the fossil record that have ever been considered to be jawless fish, excluding purely vernacular terms. The list includes all commonly… …   Wikipedia

  • Benneviaspidida — Taxobox name = Benneviaspidida image caption = Boreaspis , a fish in order Benneviaspidida fossil range = Early Devonian regnum = Animalia phylum = Chordata classis = Osteostraci Benneviaspidida is an order in cladogram of prehistoric fishes… …   Wikipedia

  • Cephalaspidiformes — Osteostraci Cephalaspis lyellii Zeitraum Oberer Silur bis Oberdevon 430 bis 370 Mio. Jahre Fossilfundorte Nordamerika …   Deutsch Wikipedia

  • Osteostraci — Cephalaspis, Lebendrekonstruktion Zeitraum Oberer Silur bis Oberdevon 430 bis 370 Mio. Jahre Fundorte …   Deutsch Wikipedia

  • Chordata (classification phylogénétique) — Cette page a pour objet de présenter un arbre phylogénétique des Chordata (Chordés ou Cordés), c est à dire un cladogramme mettant en lumière les relations de parenté existant entre leurs différents groupes (ou taxa), telles que les dernières… …   Wikipédia en Français

  • Les dinosaures et autres espèces préhistoriques découverts dans le monde — Liste de fossiles par pays Les dinosaures, les oiseaux, les mammifères, les reptiles, les amphibiens, les poissons et toutes les autres espèces vivantes sur terre sont apparus sur terre plusieurs milliers d années avant l homme. Leurs formes sont …   Wikipédia en Français

  • Liste de fossiles par pays — Sommaire : Haut A B C D E F G H I J K L M N O P Q R S T U V W X Y Z A Afrique du Sud …   Wikipédia en Français

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”