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Do caecillians have bones

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Anonymous

16y ago
Updated: 8/17/2019

Yes. Caecillians are of the subclass lissamphibia, which includes anurans (frogs), Urodellans, (salamanders) and gymnophiona (caecillians) The taxonomic progression is as follows:

Kingdom: Animalia (not plants, protists, etc.)

phylum: chordata (possessing of a spinal chord)

subphylum: vertebrata (possessing of a backbone)

superclass: tetrapods (tetrapod means four limbs)

class: amphibia (both fossil and extant amphibians)

subclass: lissamphibia (extant amphibians)

Caecillians lost their legs secondarily, that is, their ancestors had legs and their progression toward an increasingly fossorial (burrowing) lifestyle created a selection pressure toward the loss of legs. The clues to this lie in the pectoral girdles where their legs used to articulate. They have a heavily ossified skull for digging, a specialized jaw which locks so they don't get mouthfuls of dirt while digging. They have ribs but they don't encircle the body.

many worms are also fossorial but they are in the phylum annelida, not chordata. They have converged on very similar body styles as a result of congruency in their lifestyle.

Hope this clears things up.

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Wiki User

16y ago

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