Abstract
The Annelida, Echiura, Sipuncula and Mollusca are usually grouped together on the same branch of the phylogenetic tree (Figs. 3.1, 3.2) because some members of each phylum hatch as larvae so similar that they are given the same name, trochophore. This grouping reflects the widely held assumption that similar larvae reflect the true affinities of adults, but I disagree. Trochophore larva will be considered later, but first let us consider the adults of the four phyla.
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© 2003 Springer Science+Business Media Dordrecht
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Williamson, D.I. (2003). Trochophorate Animals: Polychaetes, Echiurans, Sipunculans, Molluscs. In: The Origins of Larvae. Springer, Dordrecht. https://doi.org/10.1007/978-94-017-0357-4_6
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DOI: https://doi.org/10.1007/978-94-017-0357-4_6
Publisher Name: Springer, Dordrecht
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