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. [2]
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