About: Spec: Chondrichthyes   Sponge Permalink

An Entity of Type : owl:Thing, within Data Space : 134.155.108.49:8890 associated with source dataset(s)

The chondrichthyans (hybodonts, sharks, rays and chimeras) are jawed fish that possess skeletons made out of cartilage rather than bone. An ancient and phenomenally resilient group of fish, they combine extreme morphological refinement with archaic features that are little-changed from their Devonian ancestors. In either timeline, they include some of the weirdest, biggest and most feared creatures in the sea.

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  • Spec: Chondrichthyes
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  • The chondrichthyans (hybodonts, sharks, rays and chimeras) are jawed fish that possess skeletons made out of cartilage rather than bone. An ancient and phenomenally resilient group of fish, they combine extreme morphological refinement with archaic features that are little-changed from their Devonian ancestors. In either timeline, they include some of the weirdest, biggest and most feared creatures in the sea.
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abstract
  • The chondrichthyans (hybodonts, sharks, rays and chimeras) are jawed fish that possess skeletons made out of cartilage rather than bone. An ancient and phenomenally resilient group of fish, they combine extreme morphological refinement with archaic features that are little-changed from their Devonian ancestors. In either timeline, they include some of the weirdest, biggest and most feared creatures in the sea. While concentrating on those forms that are unique to Spec, it must be stressed that the chondrichthyan faunas of both timelines share remarkable overall similarities. In fact, Spec and Home-Earth share at least 60 % of their cartilaginous fish species. Any diver or fisherman from Home-Earth who is suddenly dropped into the seas of Spec should be able to recognise some familiar toothy-grins. The vast majority of shared species groups belong to forms whose fossil record extends well back into the Mesozoic Era. When one considers that these clades have remained essentially unchanged in our timeline since the Cretaceous or even the Jurassic, it is not surprising that they have shown a similar degree of resilience and conservatism on Spec.
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