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Tentacle
In zoology, a tentacle is a flexible, mobile, elongated organ present in some species of animals, most of them invertebrates. In animal anatomy, tentacles usually occur in one or more pairs. Anatomically, the tentacles of animals work mainly like muscular hydrostats. Most forms of tentacles are used for grasping and feeding. Many are sensory organs, variously receptive to touch, vision, or to the smell or taste of particular foods or threats. Examples of such tentacles are the "eye stalks" of various kinds of snails. Some kinds of tentacles have both sensory and manipulatory functions.
The word tentillum literally means "little tentacle". However, irrespective of size, it usually refers to a side branch of a larger tentacle. In some cases such tentilla are specialised for particular functions; for example, in the Cnidaria tentilla usually bear cnidocytes,〔(Marine Species Identification Portal : Zooplankton of the South Atlantic Ocean : Glossary : tentilla ). Species-identification.org. Retrieved on 2013-05-02.〕 whereas in the Ctenophora they usually bear collocytes.〔Harmer, Sir Sidney Frederic; Shipley, Arthur Everett et al. (1906) ''The Cambridge natural history Volume 1, Protozoa, Porifera, Coelenterata, Ctenophora, Echinodermata''. Macmillan Company.〕
==Invertebrates==
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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