This volume of the Handbook of Zoology summarizes "small" groups of
animals across the animal kingdom. Dicyemida and Orthonectida are
enigmatic parasites, formerly united as "Mesozoa" and their
position among the multicellular animals is still not known with
certainty. Placozoa are small, flat marine animals which provide
important information on metazoan evolution. Comb jellies
(Ctenophora) are esthetically fascinating animals which cause
considerable discussion about their phylogenetic position.
Seisonida are closely related to rotifers and acanthocephalans.
Cycliophora were discovered and described as one of the last higher
taxa and surprise by their complex life cycle. Kamptozoa (=
Entoprocta) are small sessile animals in the sea and sometimes also
in freshwater. Arrow worms (Chaetognatha) play an important role as
predators in the plankton, but they also include benthic forms.
Pterobranchia and acorn worms (Enteropneusta) belong to the
deuterostomia and are related to echinoderms. In particular
enteropneusts play an important role in understanding deuterostome
evolution. These chapters provide up to date reviews of these
exiting groups with reference to the important literature and
therefore serves as an important source of information.
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