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- Acanthodii abstract "Acanthodii or acanthodians (sometimes called spiny sharks) is a paraphyletic class of extinct fish, sharing features with both bony fish and cartilaginous fish. In form they resembled sharks, but their epidermis was covered with tiny rhomboid platelets like the scales of holosteans (gars, bowfins). They represent several independent phylogenetic branch of fishes leading to the still-extant Chondrichthyes.The popular name "spiny sharks" is a partial misnomer for these early jawed fishes. The name was coined because they were superficially shark-shaped, with a streamlined body, paired fins, and a strongly upturned tail; stout, largely immovable bony spines supporting all the fins except the tail - hence, "spiny sharks"; in retrospect, however, their close relation to modern cartilaginous fish can lead them to be considered "stem-sharks". Fossilized spines and scales are often all that remains of these fishes in ancient sedimentary rocks. Although not sharks or cartilaginous fish, acanthodians did, in fact, have a cartilaginous skeleton, but their fins had a wide, bony base and were reinforced on their anterior margin with a dentine spine. The earliest acanthodians were marine, but during the Devonian, freshwater species became predominant.There are three orders recognized: Climatiiformes, Ischnacanthiformes and Acanthodiformes. Climatiiforma had shoulder armor and many small sharp spines, Ischnacanthiforma with teeth fused to the jaw, and the Acanthodiforma were filter feeders, with no teeth in the jaw, but long gill rakers. Overall, the acanthodians' jaws are presumed to have evolved from the first gill arch of some ancestral jawless fishes that had a gill skeleton made of pieces of jointed cartilage.".
- Acanthodii thumbnail Acanthodes_BW.jpg?width=300.
- Acanthodii wikiPageExternalLink Acanthodiformes.htm.
- Acanthodii wikiPageExternalLink Ischnacanthiformes.
- Acanthodii wikiPageExternalLink Climatiiformes.htm.
- Acanthodii wikiPageExternalLink Ischnacanthiformes.htm.
- Acanthodii wikiPageExternalLink showpost.php?p=18038&postcount=1.
- Acanthodii wikiPageExternalLink cata3.htm.
- Acanthodii wikiPageID "945696".
- Acanthodii wikiPageLength "8190".
- Acanthodii wikiPageOutDegree "52".
- Acanthodii wikiPageRevisionID "680181210".
- Acanthodii wikiPageWikiLink Acanthodes.
- Acanthodii wikiPageWikiLink Acanthodiformes.
- Acanthodii wikiPageWikiLink Bony_fish.
- Acanthodii wikiPageWikiLink Bowfin.
- Acanthodii wikiPageWikiLink Branchial_arch.
- Acanthodii wikiPageWikiLink Carboniferous.
- Acanthodii wikiPageWikiLink Cartilage.
- Acanthodii wikiPageWikiLink Cartilaginous_fish.
- Acanthodii wikiPageWikiLink Category:Acanthodii.
- Acanthodii wikiPageWikiLink Category:Animal_classes.
- Acanthodii wikiPageWikiLink Category:Cartilaginous_fish.
- Acanthodii wikiPageWikiLink Category:Permian_extinctions.
- Acanthodii wikiPageWikiLink Category:Silurian_first_appearances.
- Acanthodii wikiPageWikiLink Chondrichthyes.
- Acanthodii wikiPageWikiLink Climatiiformes.
- Acanthodii wikiPageWikiLink Coal_swamp.
- Acanthodii wikiPageWikiLink Devonian.
- Acanthodii wikiPageWikiLink Entelognathus.
- Acanthodii wikiPageWikiLink Epidermis.
- Acanthodii wikiPageWikiLink Epidermis_(skin).
- Acanthodii wikiPageWikiLink Extant_taxon.
- Acanthodii wikiPageWikiLink Filter_feeder.
- Acanthodii wikiPageWikiLink Fish.
- Acanthodii wikiPageWikiLink Gar.
- Acanthodii wikiPageWikiLink Gill.
- Acanthodii wikiPageWikiLink Gill_arch.
- Acanthodii wikiPageWikiLink Ichthyolith.
- Acanthodii wikiPageWikiLink Ischnacanthiformes.
- Acanthodii wikiPageWikiLink Neontology.
- Acanthodii wikiPageWikiLink Operculum_(fish).
- Acanthodii wikiPageWikiLink Osteichthyes.
- Acanthodii wikiPageWikiLink Paraphyletic.
- Acanthodii wikiPageWikiLink Paraphyly.
- Acanthodii wikiPageWikiLink Permian.
- Acanthodii wikiPageWikiLink Placoderm.
- Acanthodii wikiPageWikiLink Placodermi.
- Acanthodii wikiPageWikiLink Richard_Owen.
- Acanthodii wikiPageWikiLink Scale_(anatomy).
- Acanthodii wikiPageWikiLink Scale_(zoology).
- Acanthodii wikiPageWikiLink Sedimentary_rock.
- Acanthodii wikiPageWikiLink Shark.
- Acanthodii wikiPageWikiLink Shoulder_girdle.
- Acanthodii wikiPageWikiLink Silurian.
- Acanthodii wikiPageWikiLink Skeleton.
- Acanthodii wikiPageWikiLink Teeth.
- Acanthodii wikiPageWikiLink Tetrapod.
- Acanthodii wikiPageWikiLink Thelodont.
- Acanthodii wikiPageWikiLink Thelodonti.
- Acanthodii wikiPageWikiLink Tooth.
- Acanthodii wikiPageWikiLink File:Diplacanthus.jpg.
- Acanthodii wikiPageWikiLink File:Mesacanthus_Parexus_Ischnacanthus.JPG.
- Acanthodii wikiPageWikiLinkText "Acanthodians".
- Acanthodii wikiPageWikiLinkText "Acanthodii".
- Acanthodii wikiPageWikiLinkText "acanthodian fish".
- Acanthodii wikiPageWikiLinkText "acanthodian".
- Acanthodii wikiPageWikiLinkText "acanthodians".
- Acanthodii wikiPageWikiLinkText "acanthodii".
- Acanthodii wikiPageWikiLinkText "spiny shark".
- Acanthodii wikiPageWikiLinkText "spiny sharks".
- Acanthodii authority "Owen, 1846".
- Acanthodii fossilRange "(Survival in modern Chondrichthyes)".
- Acanthodii hasPhotoCollection Acanthodii.
- Acanthodii imageCaption "Acanthodes sp.".
- Acanthodii imageWidth "250".
- Acanthodii subdivision Climatiiformes.
- Acanthodii subdivision "Acanthodiformes".
- Acanthodii subdivision "Ischnacanthiformes".
- Acanthodii subdivisionRanks "Orders".
- Acanthodii wikiPageUsesTemplate Template:Automatic_taxobox.
- Acanthodii wikiPageUsesTemplate Template:Citation.
- Acanthodii wikiPageUsesTemplate Template:Cite_web.
- Acanthodii wikiPageUsesTemplate Template:Clear.
- Acanthodii wikiPageUsesTemplate Template:Evolution_of_fish.
- Acanthodii wikiPageUsesTemplate Template:Redirect.
- Acanthodii wikiPageUsesTemplate Template:Refimprove.
- Acanthodii wikiPageUsesTemplate Template:Reflist.
- Acanthodii subject Category:Acanthodii.
- Acanthodii subject Category:Animal_classes.
- Acanthodii subject Category:Cartilaginous_fish.
- Acanthodii subject Category:Permian_extinctions.
- Acanthodii subject Category:Silurian_first_appearances.
- Acanthodii hypernym Class.
- Acanthodii type Article.
- Acanthodii type Article.
- Acanthodii comment "Acanthodii or acanthodians (sometimes called spiny sharks) is a paraphyletic class of extinct fish, sharing features with both bony fish and cartilaginous fish. In form they resembled sharks, but their epidermis was covered with tiny rhomboid platelets like the scales of holosteans (gars, bowfins). They represent several independent phylogenetic branch of fishes leading to the still-extant Chondrichthyes.The popular name "spiny sharks" is a partial misnomer for these early jawed fishes.".
- Acanthodii label "Acanthodii".
- Acanthodii sameAs قرشيات_شوكية.
- Acanthodii sameAs Qəlsəməçənəlilər.