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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.
Banksia tortifolia is a small, spreading, prostrate shrub that is endemic to the southwest of Western Australia. It has short underground stems, pinnatipartite leaves with sharply-pointed, linear lobes on each side, greenish-cream, yellow and pink flowers in heads of about eighty, and glabrous, egg-shaped follicles.
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 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 fumosus 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 solidus is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus gracilis is a sessile hemichordate belonging to the order Cephalodiscida.
References
- ↑ Johnston T, Muirhead N (1951) Cephalodiscus. Report of the British Australian and New Zealand Antarctic Expedition. pp. 91-120.
- ↑ Swalla, B.J.; van der Land, J. (2020). "Cephalodiscus australiensis". WoRMS. World Register of Marine Species . Retrieved September 17, 2020.
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