Rhabdopleurida
Rhabdopleurida
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Rhabdopleurida

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Rhabdopleurida

Rhabdopleurida is one of three orders in the class Pterobranchia, which are small, worm-shaped animals, and the only surviving graptolites. Members belong to the hemichordates. Species in this order are sessile, colonial, connected with a stolon, living in clear water and secrete tubes called tubarium. They have a single gonad, the gill slits are absent and the collar has two tentaculated arms. Rhabdopleura is the best studied pterobranch in developmental biology.

The family contains a single extant genus, Rhabdopleura. Based on Maletz and Beli (2018), the following genera are recognised in the family Rhabdopleuridae:

Order Rhabdopleurida Fowler, 1892

Genera interpreted as possible stolons of members of Rhabdopleuridae:

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