Monotrysia

…However, even today scholars have different opinions on which part of the body should be used as the basis. There is a method of dividing the Lepidoptera into two families based on the similarity of the wing veins of the forewings, the Homoneura suborder for those with little difference between them and the Heteroneura suborder for those with a large difference, and further dividing them into families based on the body structure, or a method of dividing them into Monotrysia for those with one female genital opening and Ditrysia for those with two female genital openings based on the number of female genital openings. However, the current method of dividing Lepidoptera into Monotrysia and Ditrysia, adding the Homoneura and Heteroneura suborders based on the similarity of the wing veins, and dividing the Lepidoptera into 21 superfamilies so that the lineage can be understood according to the flow of evolution is becoming more and more common. …

*Some of the terminology that mentions "Monotrysia" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…しかし現在でも体のどの部分を基準にするかは学者によって見解が異なる。前･後翅の翅脈の類似性をとり上げ両者の差が少ないものを同脈亜目Homoneura，大きいものを異脈亜目Heteroneuraと二分し，さらに体の構造で科に分ける方法と，雌の生殖口の数によって一つのものを単門亜目Monotrysia，二つのものを二門亜目Ditrysiaに分ける方法とがある。　しかし現在は単門類と二門類に分け，それに翅脈の類似性による同脈亜目と異脈亜目による分類法を加味し，進化の流れにそって系統がわかるように鱗翅目全体を21の上科に大別する方法が普遍化しつつある。…

※「Monotrysia」について言及している用語解説の一部を掲載しています。

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