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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.

Genera
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 • Family Rhabdopleuridae Harmer, 1905 • Genus Rhabdopleura Allman in Norman, 1869 • Genus †Archaeolafoea Chapman, 1919 • Genus †Chaunograptus Hall, 1882 • Genus †Sokoloviina Kirjanov, 1968 • Genus †Epigraptus Eisenack, 1941 • Genus †Graptovermis Kozłowski, 1949 • Genus †Haplograptus Ruedemann, 1933 • Genus †Kystodendron Kozłowski, 1959 • Genus †Rhabdopleurites Kozłowski, 1967 • Genus †Rhabdopleuroides Kozłowski, 1961 • Genus †Sphenoecium Chapman & Thomas, 1936 • Genus †Stolonodendrum Kozłowski, 1949 Genera interpreted as possible stolons of members of Rhabdopleuridae: • Genus †Calyxhydra Kozłowski, 1959 • Genus †Chitinodendron Eisenack, 1937 • Genus †Diplohydra Kozłowski, 1959 • Genus †Flexihydra Kozłowski, 1959 • Genus †Lagenohydra Kozłowski, 1959 • Genus †Palaeokylix Eisenack, 1932 • Genus †Palaeotuba Eisenack, 1934 • Genus †Phragmohydra Kozłowski, 1959 • Genus †Rhabdohydra Kozłowski, 1959 ==References==
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