Taxobox | color = khaki
name = Hypotrichs
domain = Eukaryota
phylum = Ciliophora
subclassis = Hypotrichia
subclassis_authority = Stein 1859 "emend."
subdivision_ranks = Typical orders
subdivision = Euplotida
KiitrichidaThe hypotrichs are a group of
ciliateprotozoa, included among the spirotrichs. Most are oval in shape, with a rigid pellicle, and have cirri distributed in isolated tufts on the ventral surface of the cell. Some also have dorsal cilia, which function as sensory bristles. "Euplotes" and "Aspidisca" are common genera. Like other ciliates, hypotrichs reproduce by cell divisionand conjugation.
The hypotrichs were first defined by
Friedrich von Steinin 1859. Originally the stichotrichs, which also have cirri, were included here, but they were separated out by Small & Lynn, 1981, who placed the restricted hypotrichs among the Nassophoreabecause of various peculiarities in their infraciliature. More recent schemes reverse this move, and some molecular studies suggest they may be paraphyleticto the stichotrichs as currently defined.
* [http://cabfst28.cnea.gov.ar/~zanette/micro/hypotrichida/ Hypotrich photographs (text in Spanish)]
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