Elasmobranchii facts for kids

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Elasmobranchii
Temporal range: Late Silurian - Recent
Great white shark (Carcharodon carcharias)
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Chondrichthyes
Subclass: Elasmobranchii
Bonaparte, 1838

Elasmobranchii is a subclass of Chondrichthyes or cartilaginous fish, that includes the sharks and the rays and skates.

Evolution

Fossilised shark teeth are known from the early Devonian, around 400 million years ago. During the following Carboniferous period, the sharks underwent a period of diversification, with many new forms evolving. Many of these became extinct during the Permian, but the remaining sharks underwent a second burst of adaptive radiation during the Jurassic, around which time the skates and rays first appeared.

Taxonomy

  • Subclass Elasmobranchii
    • Plesioselachus
    • †Order Squatinactiformes
    • †Order Protacrodontiformes
    • †Infraclass Cladoselachimorpha
      • †Order Cladoselachiformes
    • †Infraclass Xenacanthimorpha
      • †Order Xenacanthiformes
    • Infraclass Euselachii (sharks and rays)
      • †Order Ctenacanthiformes
      • †Division Hybodonta
        • †Order Hybodontiformes
      • Division Neoselachii
        • Subdivision Selachii (Selachimorpha) (modern sharks)
          • Superorder Galeomorphi
            • Order Heterodontiformes (bullhead sharks)
            • Order Orectolobiformes (carpet sharks)
            • Order Lamniformes (mackerel sharks)
            • Order Carcharhiniformes (ground sharks)
          • Superorder Squalomorphi
            • Order Hexanchiformes (frilled and cow sharks)
            • Order Squaliformes (dogfish sharks)
            • †Order Protospinaciformes
            • Order Squatiniformes (angel sharks)
            • Order Pristiophoriformes (sawsharks)
        • Subdivision Batoidea (rays)
            • Order Torpediniformes (electric rays)
            • Order Pristiformes (sawfishes)
            • Order Rajiformes (skates and relatives)
            • Order Myliobatiformes (stingrays and relatives)

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