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Timema
''Timema'' is a genus of relatively short-bodied, stout stick insects native to the far western United States. The genus was first described in 1895 by Samuel Hubbard Scudder, based on observations of the species ''Timema californicum''.
Compared to other stick insects (order Phasmatodea), the genus ''Timema'' is considered basal; that is, the earliest "branch" to diverge from the phylogenetic tree that includes all Phasmatodea. To emphasize this outgroup status, all stick insects not included in ''Timema'' are sometimes described as "Euphasmatodea."
Five of the twenty-one species of ''Timema'' are parthenogenetic, including two species that have not engaged in sexual reproduction for one million years, the longest known asexual period for any insect.〔
==Description==
''Timema'' spp. differ from other Phasmatodea in that their tarsi have three segments rather than five. For stick insects, they have relatively small, stout bodies, so that they look somewhat like earwigs (order Dermaptera).
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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