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单词 Elasmobranchii
释义
Elasmobranchii

Biology
  • See chondrichthyes.


Geology and Earth Sciences
  • Subclass of shark-like fish. They have 5–7 gill slits, fairly rigid fins, placoid scales, a spiracular opening behind the jaws, numerous teeth, and claspers on the ventral fins of the male. Elasmobranchs have a cartilaginous skeleton and their fossil record consists mainly of teeth and fin rays. Well-known fossil genera include Cladoselache (Devonian), and Ctenacanthus (Upper Devonian to Lower Permian). See cartilage; cartilaginous fish.


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