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Tegmen : ウィキペディア英語版
Tegmen

A tegmen (plural: ''tegmina'') designates the modified leathery front wing on an insect particularly in the orders Dermaptera (earwigs), Orthoptera (grasshoppers, crickets and similar families), Mantodea (praying mantis), Phasmatodea (stick and leaf insects) and Blattodea (cockroaches).
==The nature of tegmina==

The term ''tegmen'' refers to a miscellaneous and arbitrary group of organs in various orders of insects; they certainly are homologous in the sense that they all are derived from insect forewings, but in other senses they are analogous; for example, the evolutionary development of the short elytra of the Dermaptera shared none of the history of the development of tegmina in the Orthoptera, say. Also, in some other insects fore- and hindwings differ both in texture and their role in flight, but are not universally regarded as tegmina. For example, the hemelytra of some Hemiptera have been called tegmina by some authorities, but not by most modern authors.
Entomologists do not customarily refer to the fore wing of a beetle as a ''tegmen''; the term for beetles' fore wings is ''elytra''.

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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