Chorion
- Pronunciation
- /KOR-ee-on/
- Category
- Anatomy
- Singular
- Chorion
- Plural
- Chorions
Definition
The outermost layer of the eggshell in insects and arachnids, providing protection to the developing embryo.
Etymology
From Greek 'khorion', meaning 'skin' or 'membrane'.
Example
The chorion of the butterfly egg is often intricately patterned, which can aid in species identification.
Synonyms
- Eggshell layer
- Protective layer
Related Terms
- Embryo
- Oviposition
- Vitelline membrane
Usage Notes
The chorion can have various structures and textures depending on the species, including ridges, spines, or pores to facilitate gas exchange.