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Their bodies tend to be dorso-ventrally flattened, they usually have five pairs of gill slits and a large mouth set on the underside of the head.
The dermis is covered with separate dermal placoid scales.
Mammals have three bones in the middle ear and a cochlea in the inner ear.
The filaments are staggered and this is the type of muscle found in earthworms that can extend slowly or make rapid contractions.Some species are ovoviviparous and the young develop internally but others are oviparous and the larvae develop externally in egg cases.