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Introduction to the "Aschelminth" Phyla
- English
URL: http://www.ucmp.berkeley.edu/aschelminthes/aschelminthes.html
Acanthocephala -- spiny-headed parasitic worms; about 1150 species known
Chaetognatha -- arrowworms; about 70 species known.
Cycliophora -- cycliophorans; 1 species known, microscopic
Gastrotricha -- gastrotrichs; about 430 species known, all microscopic
Kinorhyncha -- kinorhynchs; about 150 species known, all microscopic
Loricifera -- loriciferans; about 10 species described, all microscopic
Nematoda -- nematodes or roundworms; about 12,000 species known, but an estimated 200,000+ species extant, mostly microscopic
Nematomorpha -- horsehair worms; about 320 species known
Priapulida -- priapulid worms; 16 species known, abut half microscopic
Rotifera -- rotifers or "wheel animalcules"; about 1500 species known, all microscopic
[ eng ] |
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Introduction to the Cephalorhyncha
- English
URL: http://www.ucmp.berkeley.edu/phyla/ecdysozoa/cephalorhyncha.html
The Cephalorhyncha are a group of ecdysozoan animals that traditionally have been classified together with a variety of unusual and lesser known organisms in a
larger group variously known as the Aschelminthes, Nemathelminthes, and/or Pseudocoelomata. This larger group is now known to be polyphyletic, and contained
several taxa that were not closely related. However, one part of that group -- the priapulids, kinorhynchs, and loriciferans -- appears to form a group in its own
right. Now these organisms are grouped with the nematodes and arthropods based on a set of shared characters including the presence of a cuticle and the fact
that they periodically shed their cuticle in a process called ecdysis. Some zoologists have suggested an even closer relationship with the nematodes, and call the
combination of nematodes and cephalorhynchs the Cycloneuralia. [ eng ] |
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