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Pterobranchia is a clade of small worm-shaped animals. They belong to the Hemichordata, and live in secreted tubes on the ocean floor. Pterobranchia feed by filtering plankton out of the water with the help of cilia attached to tentacles. There are about 25 known living pterobranch species in three genera, which are Rhabdopleura, Cephalodiscus, and Atubaria. On the other hand, there are several hundred extinct genera, some of which date from the Cambrian Period.
Cephalodiscus is a genus of hemichordates in the monotypic family Cephalodiscidae of the order Cephalodiscida.
Cephalodiscus gilchristi is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus agglutinans is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus atlanticus is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus australiensis is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus calciformis is a sessile hemichordate belonging to the order Cephalodiscida. It is the only pterobranch species with funnel-shaped tubaria.
Cephalodiscus densus is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus dodecalophus is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus evansi is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus graptolitoides is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus hodgsoni is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus indicus is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus kempi is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus levinsoni is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus nigrescens is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus planitectus is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus sibogae is a sessile hemichordate belonging to the order Cephalodiscida. Sightings of the species has been reported only once.
Cephalodiscus solidus is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus gracilis is a sessile hemichordate belonging to the order Cephalodiscida.
References
- ↑ John C (1931) Cephalodiscus. Discovery Reports 3: 223-260.
- ↑ Swalla, B.J.; van der Land, J. (2020). "Cephalodiscus fumosus". WoRMS. World Register of Marine Species . Retrieved September 17, 2020.
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