Phylum of marine, worm-like, coelomate invertebrate animals, which have pharyngeal gill slits and a body divided into three regions.
The Phylum Hemichordata is further organized into finer groupings including:
- Class (3): Enteropneusta · Graptolithina · Pterobranchia
- Species: ZipcodeZoo has pages for 589 species and subspecies in the Phylum Hemichordata.
Graptolithina is a class in the animal phylum Hemichordata, the members of which are known as Graptolites. Graptolites are fossil colonial animals known chiefly from the Upper Cambrian through the Lower Carboniferous (Mississippian). A possible early graptolite, Chaunograptus, is known from the Middle Cambrian. [more]
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 30 known living species in the group. [more]
At least 5 species and subspecies belong to the Class Pterobranchia.
More info about the Class Pterobranchia may be found here.
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