Cephalodiscida Explained

Cephalodiscida is one of two orders in the class Pterobranchia, which are small, worm-shaped animals. Members belong to the hemichordates.[1] [2] Species in this order are sessile, living in clear water and secrete tubes on the ocean floor.[3]

Taxonomy

The order is a small one, with only two known families, each containing a single extant genus. The validity of the family Atubaridae, who has only a sole member, is regarded as questionable.[4]

References

Harmer. S. F. 1905. The Pterobranchia ol the Siboga-Expedition. Siboga Exped. Monogr. 26. 1-131

Notes and References

  1. http://animaldiversity.ummz.umich.edu/site/accounts/classification/Cephalodiscida.html animaldiversity.ummz.umich.edu
  2. http://www.eol.org/pages/8855 Eol.org
  3. Shipley, A.E. (1902). Zoology: An Elementary Textbook. Cambridge: Cambridge University Press.
  4. Halanych. K. M.. 1996-02-01. Convergence in the Feeding Apparatuses of Lophophorates and Pterobranch Hemichordates Revealed by 18S rDNA: An Interpretation. The Biological Bulletin. 190. 1. 1–5. 10.2307/1542669. 0006-3185.
  5. Maletz . Jörg. The classification of the Pterobranchia (Cephalodiscida and Graptolithina) . Bulletin of Geosciences . 2014 . 89 . 3 . 477–540 . 10.3140/bull.geosci.1465 . 1214-1119. free .