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, the following genera are recognised in the family Rhabdopleuridae:Order Rhabdopleurida Fowler, 1892Family 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
- 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