an egg case of some insects and molluscs which is formed by the hardened of a sticky substance secreted from a special organ known as the colleterial gland.
covering or base of an egg
The hard foamy egg sac laid by (female adult) mantids. Contained within are between 20-400 nymphs (numbers dependent upon species, age of female, condition of ootheca etc) which hatch out by lowering themselves down on a tiny thread.
An ootheca is a type of egg mass made by any member of a variety of species (usually insects or mollusks).