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
East Islip, New York

... of the 2000 census, the town had a total population of 14,078. Geography East Islip is located at 40°43'55" North, 73°11'6" West (40.731938, ...

 
 
 
This page was created in 34.1 ms