Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Osteostraci> ?p ?o }
- Osteostraci abstract "The class Osteostraci (\"Bony Shields\") was a group of bony-armored jawless fish, termed \"ostracoderms\", that lived in what is now North America, Europe and Russia from the Middle Silurian to Late Devonian. Anatomically speaking, the osteostracans, especially the Devonian species, were among the most advanced of all known agnathans.This is due to the development of paired fins, and their complicated cranial anatomy. The osteostracans were more similar to lampreys than to jawed vertebrates in possessing two pairs of semicircular canals in the inner ear, as opposed to the three pairs found in the inner ears of jawed vertebrates. They are thought to be the sister-group of pituriaspids, and together, these two taxa of jawless vertebrates are the sister-group of gnathostomes. Several synapomorphies support this hypothesis, such as the presence of: sclerotic ossicles, paired pectoral fins, a dermal skeleton with three layers (a basal layer of isopedin, a middle layer of spongy bone, and a superficial layer of dentin), and perichondral bone.Most osteostracans had a massive cephalothorac shield, but all Middle and Late Devonian species appear to have had a reduced, thinner, and often micromeric dermal skeleton. This reduction may have occurred at least three times independently because the pattern of reduction is different in each taxon.They were probably relatively good swimmers, possessing dorsal fins, paired pectoral fins, and a strong tail. The shield of bone covering the head formed a single piece, and so presumably did not grow during adult life. However, the way in which the bone was laid down makes it possible to examine the imprints of nerves and other soft tissues. This reveals the presence of complex sensory organs and the sides and upper surface of the head, which may have been used to sense vibrations.".
- Osteostraci thumbnail Cephalaspis_species.jpg?width=300.
- Osteostraci wikiPageExternalLink chap3.htm.
- Osteostraci wikiPageID "2319313".
- Osteostraci wikiPageLength "10752".
- Osteostraci wikiPageOutDegree "75".
- Osteostraci wikiPageRevisionID "690923237".
- Osteostraci wikiPageWikiLink Aceraspis.
- Osteostraci wikiPageWikiLink Acrotomaspis.
- Osteostraci wikiPageWikiLink Aestiaspis.
- Osteostraci wikiPageWikiLink Ateleaspididae.
- Osteostraci wikiPageWikiLink Ateleaspis.
- Osteostraci wikiPageWikiLink Auchenaspis.
- Osteostraci wikiPageWikiLink Axinaspis.
- Osteostraci wikiPageWikiLink Balticaspis.
- Osteostraci wikiPageWikiLink Benneviaspida.
- Osteostraci wikiPageWikiLink Benneviaspidida.
- Osteostraci wikiPageWikiLink Boreaspidoidei.
- Osteostraci wikiPageWikiLink Category:Devonian_fish.
- Osteostraci wikiPageWikiLink Category:Famennian_extinctions.
- Osteostraci wikiPageWikiLink Category:Osteostraci.
- Osteostraci wikiPageWikiLink Category:Silurian_fish.
- Osteostraci wikiPageWikiLink Cephalaspida.
- Osteostraci wikiPageWikiLink Cephalaspis.
- Osteostraci wikiPageWikiLink Cladogram.
- Osteostraci wikiPageWikiLink Class_(biology).
- Osteostraci wikiPageWikiLink Dartmuthia.
- Osteostraci wikiPageWikiLink Devonian.
- Osteostraci wikiPageWikiLink Didymaspis.
- Osteostraci wikiPageWikiLink Dorsal_fin.
- Osteostraci wikiPageWikiLink Ectinaspis.
- Osteostraci wikiPageWikiLink Escuminaspis.
- Osteostraci wikiPageWikiLink Fish_fin.
- Osteostraci wikiPageWikiLink Gustavaspis.
- Osteostraci wikiPageWikiLink Hemicyclaspis.
- Osteostraci wikiPageWikiLink Hildenaspis.
- Osteostraci wikiPageWikiLink Hirella.
- Osteostraci wikiPageWikiLink Hoelaspis.
- Osteostraci wikiPageWikiLink Illemoraspis.
- Osteostraci wikiPageWikiLink Kiaeraspidida.
- Osteostraci wikiPageWikiLink Kiaeraspidoidea.
- Osteostraci wikiPageWikiLink Kiaeraspis.
- Osteostraci wikiPageWikiLink Lamprey.
- Osteostraci wikiPageWikiLink Levesquaspis.
- Osteostraci wikiPageWikiLink Machairaspis.
- Osteostraci wikiPageWikiLink Mimetaspis.
- Osteostraci wikiPageWikiLink Nectaspis.
- Osteostraci wikiPageWikiLink Norselaspis.
- Osteostraci wikiPageWikiLink Ostracoderm.
- Osteostraci wikiPageWikiLink Parameteoraspididae.
- Osteostraci wikiPageWikiLink Parametereoaspis.
- Osteostraci wikiPageWikiLink Pattenaspis.
- Osteostraci wikiPageWikiLink Phylogenetics.
- Osteostraci wikiPageWikiLink Procephalaspis.
- Osteostraci wikiPageWikiLink Ray_Lankester.
- Osteostraci wikiPageWikiLink Saaremaspis.
- Osteostraci wikiPageWikiLink Scolenaspis.
- Osteostraci wikiPageWikiLink Severaspis.
- Osteostraci wikiPageWikiLink Spangenhelmaspis.
- Osteostraci wikiPageWikiLink Stensiopelta.
- Osteostraci wikiPageWikiLink Superciliaspis.
- Osteostraci wikiPageWikiLink Tegaspis.
- Osteostraci wikiPageWikiLink Thyestes_(genus).
- Osteostraci wikiPageWikiLink Thyestiida.
- Osteostraci wikiPageWikiLink Timanaspis.
- Osteostraci wikiPageWikiLink Tremataspidoidea.
- Osteostraci wikiPageWikiLink Trewinia.
- Osteostraci wikiPageWikiLink Tyriaspis.
- Osteostraci wikiPageWikiLink Ukrainaspis.
- Osteostraci wikiPageWikiLink Waengsjoeaspis.
- Osteostraci wikiPageWikiLink Wenlock_(Silurian).
- Osteostraci wikiPageWikiLink Witaaspis.
- Osteostraci wikiPageWikiLink Wladysagitta.
- Osteostraci wikiPageWikiLink Zenaspida.
- Osteostraci wikiPageWikiLink Zenaspididae.
- Osteostraci wikiPageWikiLink Zychaspis.
- Osteostraci wikiPageWikiLink File:Osteostraci_Janvier.gif.
- Osteostraci wikiPageWikiLinkText "Osteostracans".
- Osteostraci wikiPageWikiLinkText "Osteostraci".
- Osteostraci wikiPageWikiLinkText "Ostracoderms".
- Osteostraci wikiPageWikiLinkText "armored jawless fish".
- Osteostraci wikiPageWikiLinkText "jawless fish".
- Osteostraci wikiPageWikiLinkText "osteostracan".
- Osteostraci wikiPageWikiLinkText "osteostracans".
- Osteostraci wikiPageWikiLinkText "osteostraci".
- Osteostraci authority "Lankester, 1868".
- Osteostraci fossilRange "(Middle Silurian to Late Devonian)".
- Osteostraci imageCaption "Cephalaspis species".
- Osteostraci subdivision Cephalaspida.
- Osteostraci subdivision "Benneviaspida".
- Osteostraci subdivision "Kiaeraspidida".
- Osteostraci subdivision "Thyestiida".
- Osteostraci subdivision "Zenaspida".
- Osteostraci subdivisionRanks "Orders".
- Osteostraci synonyms "Osteostracida".
- Osteostraci wikiPageUsesTemplate Template:Automatic_taxobox.
- Osteostraci wikiPageUsesTemplate Template:Clade.
- Osteostraci wikiPageUsesTemplate Template:Fossilrange.
- Osteostraci wikiPageUsesTemplate Template:Reflist.
- Osteostraci subject Category:Devonian_fish.