pterobranch - definitie. Wat is pterobranch
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Wat (wie) is pterobranch - definitie

CLASS OF HEMICHORDATES
Pterobranchs; Pterobranch

pterobranch         
['t?r?(?)bra?k]
¦ noun Zoology a minute tube-dwelling colonial acorn worm of a class (Pterobranchia) found chiefly in deep water.
Pterobranchia         
·noun ·pl An order of marine Bryozoa, having a bilobed lophophore and an axial cord. The genus Rhabdopleura is the type. Called also Podostomata. ·see Rhabdopleura.

Wikipedia

Pterobranchia

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.

The class Pterobranchia was established by Ray Lankester in 1877. It contained, at that time, the single genus Rhabdopleura. Rhabdopleura was at first regarded as an aberrant polyzoon, but when the Challenger report on Cephalodiscus was published in 1887, it became clear that Cephalodiscus, the second genus now included in the order, had affinities with the Enteropneusta.

Electron microscope studies have suggested that pterobranchs belong to the same clade as the extinct graptolites, and phylogenetic analysis suggests that the pterobranchs are living members of the graptolite clade.