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- Xenacanthida abstract "Xenacanthida (or Xenacanthiforms) is an order of prehistoric sharks that appeared during the Lower Carboniferous period. The order includes the families Xenacanthidae, Diplodoselachidae, and Orthacanthidae. The most notable members of the group are the genera Xenacanthus and Orthacanthus. Some Xenacanthus may have grown to lengths of 4 m (13 ft). This group of sharks inhabited freshwater environments. Some forms had large serrated spines extending backwards from the neck. Xenacanthus had characteristic teeth. The base or root of each tooth had a pair of hook-like cusps. Most Xenacanthus died out at the end of the Permian in the Permian Mass Extinction, with only a few forms surviving into the Triassic period.".
- Xenacanthida class Chondrichthyes.
- Xenacanthida class Elasmobranchii.
- Xenacanthida kingdom Animal.
- Xenacanthida order Shark.
- Xenacanthida phylum Chordate.
- Xenacanthida thumbnail Orthacanthus_BW.jpg?width=300.
- Xenacanthida wikiPageID "4261015".
- Xenacanthida wikiPageLength "2295".
- Xenacanthida wikiPageOutDegree "31".
- Xenacanthida wikiPageRevisionID "692686380".
- Xenacanthida wikiPageWikiLink Animal.
- Xenacanthida wikiPageWikiLink Anodontacanthus.
- Xenacanthida wikiPageWikiLink Carboniferous.
- Xenacanthida wikiPageWikiLink Category:Carboniferous_sharks.
- Xenacanthida wikiPageWikiLink Category:Permian_sharks.
- Xenacanthida wikiPageWikiLink Category:Prehistoric_fish_orders.
- Xenacanthida wikiPageWikiLink Category:Triassic_sharks.
- Xenacanthida wikiPageWikiLink Chondrichthyes.
- Xenacanthida wikiPageWikiLink Chordate.
- Xenacanthida wikiPageWikiLink Dicentrodus.
- Xenacanthida wikiPageWikiLink Diplodoselache.
- Xenacanthida wikiPageWikiLink Diplodoselachidae.
- Xenacanthida wikiPageWikiLink Elasmobranchii.
- Xenacanthida wikiPageWikiLink Hagenoselache.
- Xenacanthida wikiPageWikiLink Orthacanthidae.
- Xenacanthida wikiPageWikiLink Orthacanthus.
- Xenacanthida wikiPageWikiLink Orthacanthus_senckenbergianus.
- Xenacanthida wikiPageWikiLink Permian.
- Xenacanthida wikiPageWikiLink Permian–Triassic_extinction_event.
- Xenacanthida wikiPageWikiLink Plicatodus.
- Xenacanthida wikiPageWikiLink Shark.
- Xenacanthida wikiPageWikiLink Triassic.
- Xenacanthida wikiPageWikiLink Triodus.
- Xenacanthida wikiPageWikiLink Xenacanthidae.
- Xenacanthida wikiPageWikiLink Xenacanthus.
- Xenacanthida wikiPageWikiLinkText "Xenacanth".
- Xenacanthida wikiPageWikiLinkText "Xenacanthida".
- Xenacanthida wikiPageWikiLinkText "xenacanth".
- Xenacanthida wikiPageWikiLinkText "xenacanthida".
- Xenacanthida wikiPageWikiLinkText "xenacanthiform".
- Xenacanthida classis Chondrichthyes.
- Xenacanthida fossilRange "Lower Carboniferous - Middle Triassic".
- Xenacanthida imageCaption "Orthacanthus senckenbergianus".
- Xenacanthida imageWidth "250".
- Xenacanthida name "Xenacanthida".
- Xenacanthida ordo "Xenacanthida".
- Xenacanthida ordoAuthority "Glikman, 1964".
- Xenacanthida phylum Chordate.
- Xenacanthida regnum "Animalia".
- Xenacanthida subclassis Elasmobranchii.
- Xenacanthida subdivision "See text.".
- Xenacanthida subdivisionRanks "families and genera".
- Xenacanthida superordo Shark.
- Xenacanthida wikiPageUsesTemplate Template:Carboniferous-stub.
- Xenacanthida wikiPageUsesTemplate Template:Convert.
- Xenacanthida wikiPageUsesTemplate Template:Paleo-shark-stub.
- Xenacanthida wikiPageUsesTemplate Template:Permian-stub.
- Xenacanthida wikiPageUsesTemplate Template:Portal.
- Xenacanthida wikiPageUsesTemplate Template:Reflist.
- Xenacanthida wikiPageUsesTemplate Template:Taxobox.
- Xenacanthida wikiPageUsesTemplate Template:Triassic-stub.
- Xenacanthida subject Category:Carboniferous_sharks.
- Xenacanthida subject Category:Permian_sharks.
- Xenacanthida subject Category:Prehistoric_fish_orders.
- Xenacanthida subject Category:Triassic_sharks.
- Xenacanthida hypernym Order.
- Xenacanthida type Animal.
- Xenacanthida type Eukaryote.
- Xenacanthida type Fish.
- Xenacanthida type Species.
- Xenacanthida type Thing.
- Xenacanthida type Q152.
- Xenacanthida type Q19088.
- Xenacanthida type Q729.
- Xenacanthida comment "Xenacanthida (or Xenacanthiforms) is an order of prehistoric sharks that appeared during the Lower Carboniferous period. The order includes the families Xenacanthidae, Diplodoselachidae, and Orthacanthidae. The most notable members of the group are the genera Xenacanthus and Orthacanthus. Some Xenacanthus may have grown to lengths of 4 m (13 ft). This group of sharks inhabited freshwater environments. Some forms had large serrated spines extending backwards from the neck.".
- Xenacanthida label "Xenacanthida".
- Xenacanthida sameAs Q119359.
- Xenacanthida sameAs Xenacanthida.
- Xenacanthida sameAs Xenacanthiformes.
- Xenacanthida sameAs Xenacanthiformes.
- Xenacanthida sameAs شگفتتیغسانان.
- Xenacanthida sameAs Xenacanthiformes.
- Xenacanthida sameAs m.0bswz3.
- Xenacanthida sameAs Ксенакантообразные.
- Xenacanthida sameAs Xenacanthida.
- Xenacanthida sameAs Q119359.
- Xenacanthida wasDerivedFrom Xenacanthida?oldid=692686380.
- Xenacanthida depiction Orthacanthus_BW.jpg.
- Xenacanthida isPrimaryTopicOf Xenacanthida.
- Xenacanthida name "Xenacanthida".