endochorion

endochorion

(ĕn″dō-kō′rē-ŏn) [″ + chorion, chorion]
The inner chorion; the vascular layer of the allantois.

endochorion

the inner layer of the CHORION in the insect egg.
References in periodicals archive ?
The elucidation and naming of eggshell (= exochorion) and internal layers (endochorion, vitelline membrane and exuvia) is based on Snodgrass (1935), Moscona (1950), Bedford (1970), Furneaux and Mackay (1976) and Gullan and Cranston (2010).
Internal layers (Figs 10-15) and pharate first instar nymph inside egg (Figs 16-18): Pharate first instar nymph enclosed by three layers within shell (exochorion), identified as endochorion (outermost), vitelline membrane, and cast off embryonic exuvia (innermost).
rusticus is composed of exochorion and endochorion. Exochorion shows a fibrous matrix with homogeneous electron dense rounded bodies and smaller electron dense oval structures embedded into it.