The Cyclostomata is an ancient group of aquatic colonial suspension-feeders from the phylum Bryozoa. The fact that they have unique placentae has been discovered by researchers. The Cyclostomata is an ...

The Cyclostomata is an ancient group of aquatic colonial suspension-feeders from the phylum Bryozoa. The fact that they have unique placentae has been discovered by researchers at St Petersburg ...

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IN accounts of the Cyclostomata it is generally said that the Ammocœtes larva of the lamprey feeds by means of a current of water caused by the action of its pharyngeal cilia, and that food particles, ...