Trochozoa

The Trochozoa are a collection of several phyla of animals, including most
notably the mollusks and annelids, as well as the smaller phyla Nemertea and
Sipuncula. They are united by the common presence of trocophore larvae,
which have two bands of cilia around the middle.

Originally, the arthropods were also considered to belong here as close
relatives of the annelids, though no trocophores occur within the group.
More recently this has been called into question, and RNA studies remove
them to the Ecdysozoa, though they confirm the unity of the remaining
Trochozoa. The lophophorates are often considered close relatives of the
Trochozoa, and possibly the rotifers and their allies as well.

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