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unicuspid
A unicuspid is a tooth that has only one cusp.〔"unicuspid." ''Dictionary.Com.'' 16 June 2010. .〕
==In shrews==
The dental formulas of shrews are distinguished by the number of unicuspids. All shrews have (in one half of each jaw) one large incisor followed by a variable number of unicuspids, followed by a complex premolar, followed by three molars. All shrews except for those of the genus ''Myosorex'' have one lower unicuspid; ''Myosorex'' has two. The genera ''Blarina'', ''Blarinella'', and ''Sorex'' have five upper unicuspids. The genera ''Myosorex'', ''Feroculus'', ''Scutisorex'', ''Suncus'', ''Sylvisorex'', ''Ruwenzorisorex'', ''Cryptotis'', ''Neomys'', ''Soriculus'', and ''Episoriculus'' have four upper unicuspids. The genera ''Congosorex'', ''Surdisorex'', ''Solisorex'', ''Paracrocidura'', ''Crocidura'', ''Chimarrogale'', ''Chodsigoa'', ''Megasorex'', ''Nectogale'', and ''Notiosorex'' have three upper unicuspids. The genera ''Diplomesodon'' and ''Anourosorex'' have two upper unicuspids.〔Merritt, Joseph F. ''Advances in the Biology of Shrews II''. New York: International Society of Shrew Biologists. 2005.〕
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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