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Additional
Hemichordata
English Wikipedia - The Free Encyclopedia
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Hemichordate
Hemichordata
is a
phylum
of marine
deuterostome
animals
, generally considered the sister group of the
echinoderms
. They appear in the Lower or Middle
Cambrian
and include two main classes:
Enteropneusta
(acorn worms), and
Pterobranchia
. A third class, Planctosphaeroidea, is known only from the larva of a single species,
Planctosphaera pelagica
. The extinct class
Graptolithina
is closely related to the pterobranchs.
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