centrolecithal egg; mesolecithal egg
Technical term in embryology for an egg with yolk concentrated in the center, typical of insects and many arthropods.
Insect eggs are often centrolecithal.
等黄卵 (isolecithal egg) has yolk evenly distributed, as in mammals, unlike the central yolk of 中黄卵.
Compound of 中 (center), 黄 (yolk), and 卵 (egg), directly describing the yolk position.