tunicata

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tunicates
The body is usually covered with a firm external tunic, consisting in part of cellulose, and having two openings, one for the entrance and one for the exit of water
The pharynx is usually dilated in the form of a sac, pierced by several series of ciliated slits, and serves as a gill
A grand division of the animal kingdom, intermediate, in some respects, between the invertebrates and vertebrates, and by some writers united with the latter
They were formerly classed with acephalous mollusks
tunicata
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