Encyclopedia > Urochordata

Article Content

Urochordata

Urochordata (Tunicate worms, "Sea Squirts") are sacklike filter feeders[?] with input and output siphons[?].

Some larval forms appear very much like primitive chordates or hemichordates with a notochord[?] (primitive spinal cord). Some forms have a calcereous spicule that may be preserved as a fossil. Jurassic to Present with one proposed Neoproterozoic form - Yarnemia. Some workers class the Urochordates as a subphylum of the chordata.

All Wikipedia text is available under the terms of the GNU Free Documentation License

Search Encyclopedia

Search over one million articles, find something about almost anything!

Featured Article

Canadian Charter of Rights and Freedoms

... Canadian Charter of Rights and Freedoms is the bill of rights which forms part of the Constitution of Canada adopted in 1982. The Charter developed out of the United ...