In hemicephalous larvae, the head and its appendages are reduced and partially retracted into the thorax.
半头型无足幼虫头部部分退化，后
胸部，如双翅目的大蚊及一些寄生性
翅目幼虫。
In hemicephalous larvae, the head and its appendages are reduced and partially retracted into the thorax.
半头型无足幼虫头部部分退化，后胸部，如双翅目的大蚊及一些寄生性翅目幼虫。
The mines of Hymenoptera wasps have more and darker frass than the mines of dipetrous flies.
与双翅目相比，翅目蜂类的粪便更多更黑；鞘翅目甲虫类则经常造成叶子的缺
。
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