http://ims.dse.ibaraki.ac.jp/research/C_elegans_en.html
Caenorhabditis elegans (C. elegans) is a phylum Nematoda. It is 1.5mm in length and lives in the soil. Because of its transparent body, ontogenesis is observed by Nomarski-type differential interference contrast microscopy as it is alive.
C. elegans has necessary minimum systems as an animal, such as epidermis, nervous system, muscular system, digestive organ and reproductive organ. Most of worms are hermaphrodite, and only 0.2% of them are male.
The hermaphrodite C. elegans consists of 959 somatic cells. The 959 somatic cells represent most of the major differentiated tissue types including neurons (302 cells), muscles (111 cells), intestine (34 cells) and epidermis (213 cells).
On C. elegans, the followings have been determined:
Cell lineage (1977, 1983)
Structure and synaptic connectivity of the nervous system (1976, 1986)
Genome sequence (1998)
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