In hemicephalous larvae, the head and its appendages are reduced and partially retracted into the thorax.
半头型无足
头部部分退化，后端缩入胸部，如双翅
的大蚊及一些寄生性
翅。
In hemicephalous larvae, the head and its appendages are reduced and partially retracted into the thorax.
半头型无足头部部分退化，后端缩入胸部，如双翅的大蚊及一些寄生性翅。
The mines of Hymenoptera wasps have more and darker frass than the mines of dipetrous flies.
与双翅相比，翅蜂类的粪
黑；鞘翅甲类则经常造成叶子的缺刻。
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