Stonefly (wings) - Stonefly (English spelling)

Japanese: カワゲラ(襀翅∥ - カワゲラ（英語表記）stonefly

A general term for insects belonging to the order Plecoptera. They are also called pterygota. Their body structure is relatively primitive. Their mouthparts tend to degenerate, but they have not lost their function. They are closely related to Orthoptera (crickets, grasshoppers, etc.), but their forewings and hindwings are almost identical in structure, and their leg bases are small, making them completely different. Modern stoneflies are directly descended from the Markemidae of the Permian proto-stonefly order Paraplecoptera. All adults are terrestrial, but as their larvae live in flowing water, adults are often found near water, often resting on nearby grass or trees.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

カワゲラ目Plecopteraに属する昆虫の総称。襀翅（せきし）類ともいう。体は比較的原始的な構造をもっている。口器は退化的傾向にあるが，機能は失っていない。直翅類(コオロギ，バッタなど)に近縁であるが，前翅と後翅はほとんど同じ構造で，また，脚の基節が小さいことなどから完全に異なる。現代のカワゲラは二畳紀の原カワゲラ目ParaplecopteraのMarkemidaeを直接の祖先型としている。　成虫はすべて陸生であるが，幼虫は流水中で生活するため成虫も水辺に多く，近くの草や樹木に止まっていることが多い。

出典　株式会社平凡社世界大百科事典第２版について　情報

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