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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 (2018), the following genera are recognised in the family Rhabdopleuridae:

Order Rhabdopleurida <small>Fowler, 1892</small>

  • Family Rhabdopleuridae <small>Harmer, 1905</small>
  • Genus Rhabdopleura <small>Allman in Norman, 1869</small>
  • Genus †Archaeolafoea <small>Chapman, 1919</small>
  • Genus †Chaunograptus <small>Hall, 1882</small>
  • Genus †Sokoloviina <small>Kirjanov, 1968</small>
  • Genus †Epigraptus <small>Eisenack, 1941</small>
  • Genus †Graptovermis <small>Kozłowski, 1949</small>
  • Genus †Haplograptus <small>Ruedemann, 1933</small>
  • Genus †Kystodendron <small>Kozłowski, 1959</small>
  • Genus †Rhabdopleurites <small>Kozłowski, 1967</small>
  • Genus †Rhabdopleuroides <small>Kozłowski, 1961</small>
  • Genus †Sphenoecium <small>Chapman & Thomas, 1936</small>
  • Genus †Stolonodendrum <small>Kozłowski, 1949</small>

Genera interpreted as possible stolons of members of Rhabdopleuridae:

  • Genus †Calyxhydra <small>Kozłowski, 1959</small>
  • Genus †Chitinodendron <small>Eisenack, 1937</small>
  • Genus †Diplohydra <small>Kozłowski, 1959</small>
  • Genus †Flexihydra <small>Kozłowski, 1959</small>
  • Genus †Lagenohydra <small>Kozłowski, 1959</small>
  • Genus †Palaeokylix <small>Eisenack, 1932</small>
  • Genus †Palaeotuba <small>Eisenack, 1934</small>
  • Genus †Phragmohydra <small>Kozłowski, 1959</small>
  • Genus †Rhabdohydra <small>Kozłowski, 1959</small>

References

  • Marinespecies.org
  • ITIS.gov
  • Hayward, P.J.; Ryland, J.S. (Ed.) (1990). The marine fauna of the British Isles and North-West Europe: 1. Introduction and protozoans to arthropods. Clarendon Press: Oxford, UK. . 627 pp.