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Hemichordata is a phylum of marine deuterostome animals, generally considered the sister group of the echinoderms. They appear in the Lower or Middle Cambrian and include two main classes: Enteropneusta, and Pterobranchia. A third class, Planctosphaeroidea, is known only from the larva of a single species, Planctosphaera pelagica. The extinct class Graptolithina is closely related to the pterobranchs.
Pterobranchia is a class 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.
Doriprismatica sibogae is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusk in the family Chromodorididae.
Mattheus Marinus Schepman was a Dutch malacologist. He was one of the foremost collectors of mollusc shells in the Netherlands, and was also high on the overall list of European collectors.
The Siboga snake eel is an eel from the family Ophichthidae. It was described by Max Carl Wilhelm Weber in 1913, originally under the genus Callechelys. It is a marine, tropical eel which is found off the south coast of Timor, Indonesia, in the western central Pacific Ocean. Males can reach a maximum total length of 23.7 centimetres (9.3 in).
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. It is found in South Africa in 1908.
Phestilla sibogae is a species of sea slug, an aeolid nudibranch, a marine gastropod mollusk in the family Trinchesiidae. The species feeds on the hard coral genus Porites.
Billie J. Swalla is a professor of biology at the University of Washington. She was the first female director of Friday Harbor Laboratories, where she served from 2012–2019. Her lab investigates the evolution of chordates by comparative genetic and phylogenetic analysis of animal taxa.
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 evansi is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus hodgsoni 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 solidus is a sessile hemichordate belonging to the order Cephalodiscida.
Cephalodiscus gracilis is a sessile hemichordate belonging to the order Cephalodiscida.
References
- ↑ Harmer S (1905) The Pterobranchia of the Siboga Expedition. Siboga Expedition Monograph. pp. 1-31.
- ↑ Swalla, B.J.; van der Land, J. (2020). "Cephalodiscus sibogae". WoRMS. World Register of Marine Species . Retrieved September 17, 2020.
- ↑ Tassia, MG; Cannon, JT; Konikoff, CE; Shenkar, N; Halanych, KM; Swalla, BJ (2016). "The Global Diversity of Hemichordata". PLOS ONE. 11 (10): e0162564. Bibcode:2016PLoSO..1162564T. doi: 10.1371/journal.pone.0162564 . PMC 5049775 . PMID 27701429.
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