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Cirrus (biology)
A cirrus (pronounced , "", plural cirri, , ""), from the Latin ''cirrus'' meaning a ''curl-like tuft or fringe'', is a term used in biology and zoology for a number of long, thin structures in both vertebrate and invertebrate animals. In the sheep liver fluke, for example, the ''cirrus'' is the worm's muscular penis and when not in use is retained within a ''cirrus sac'' or ''pouch'' near the animal's head. The same structure exists in the various ''Taenia'' species of tapeworm. In the Nereidae, however, the term ''cirrus'' refers to tentacular processes or growths on each of the feet (''parpodia''), either the ''dorsal cirrus'' or the ''ventral cirrus'', and has nothing to do with reproduction.〔 Among the ribbonworms, the ''caudal cirrus'' is a term for a small thread-like growth at the posterior end of the worm. Among the bristleworms, a ''cirrus'' is a tentacular growth near the head or notopodium containing sense organs and may be either dorsal, ventral, or lamellar. Among feather stars or barnacles, a cirrus is a long slender gripping or feeding appendage. In sea lilies, the ''cirri'' are the thin strands that line the animal's stalk. Among the tube blennies, a ''cirrus'' is a term for a long growth extending from above the eye (a ''supraorbital cirrus'') or extending below the neck-region (a ''nuchal cirrus''). In a nautilus, each of the animal's tentacles is composed of a thin flexible ''cirrus'' and the corresponding hardened and protective ''cirrus sheath'' into which the ''cirri'' may be withdrawn.
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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