Identify the phylum with cydippid larva and write its characteristics features

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Most ctenophores have a cydippid larva. This form of larvae is ovoid or spherical with two retractable tentacles. They are free swimming larvae. 
Veliger is a planktonic larva of many sea snails and freshwater snails, marine and freshwater gastropod molluscs. Nauplius is the crustacean larva. Trochophore is the free-swimming larvae of marine annelids and most groups of molluscs.

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