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- Xenacanthida abstract "Xenacanthida (or Xenacanthiforms) is an order of prehistoric sharks that appeared during the Lower Carboniferous period. The family 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 wikiPageRevisionID "552234396".
- Xenacanthida classis Chondrichthyes.
- Xenacanthida fossilRange "Lower Carboniferous - Middle Triassic".
- Xenacanthida hasPhotoCollection Xenacanthida.
- 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 subject Category:Carboniferous_fish.
- Xenacanthida subject Category:Permian_fish.
- Xenacanthida subject Category:Prehistoric_sharks.
- Xenacanthida subject Category:Triassic_fish.
- Xenacanthida type Animal100015388.
- Xenacanthida type AquaticVertebrate101473806.
- Xenacanthida type CartilaginousFish101480516.
- Xenacanthida type Chordate101466257.
- Xenacanthida type Elasmobranch101482071.
- Xenacanthida type Fish102512053.
- Xenacanthida type LivingThing100004258.
- Xenacanthida type Object100002684.
- Xenacanthida type Organism100004475.
- Xenacanthida type PhysicalEntity100001930.
- Xenacanthida type PrehistoricSharks.
- Xenacanthida type Shark101482330.
- Xenacanthida type Vertebrate101471682.
- Xenacanthida type Whole100003553.
- Xenacanthida type Animal.
- Xenacanthida type Eukaryote.
- Xenacanthida type Fish.
- Xenacanthida type Species.
- Xenacanthida type Fish.
- Xenacanthida type Organism.
- Xenacanthida comment "Xenacanthida (or Xenacanthiforms) is an order of prehistoric sharks that appeared during the Lower Carboniferous period. The family 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 label "Xenacanthida".
- Xenacanthida label "Xenacanthiformes".
- Xenacanthida label "Xenacanthiformes".
- Xenacanthida label "Xenacanthiformes".
- Xenacanthida sameAs Xenacanthiformes.
- Xenacanthida sameAs Xenacanthiformes.
- Xenacanthida sameAs Xenacanthiformes.
- Xenacanthida sameAs m.0bswz3.
- Xenacanthida sameAs Q119359.
- Xenacanthida sameAs Q119359.
- Xenacanthida sameAs Xenacanthida.
- Xenacanthida wasDerivedFrom Xenacanthida?oldid=552234396.
- Xenacanthida depiction Orthacanthus_BW.jpg.
- Xenacanthida isPrimaryTopicOf Xenacanthida.
- Xenacanthida name "Xenacanthida".
