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Updated: May 26, 2025
The great majority of the Vermalia have these three features, and they are all wanting in the Platodes; in the rest of the worms at least one or two of them are developed. Zoologists differ as to their position in classification. Otherwise the organisation of the two classes is the same. These are the Nemertina and the Enteropneusta.
On the other hand, the Enteropneusta differ from their Nemertine ancestors in several features, some of which are important, that we may attribute to adaptation. The water that enters at the mouth makes its exit by these clefts.
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