The larvae form cocoons in the soil.
Many families of flies form cocoons sporadically; the cocoon has evolved as an adaptive device that provides extra protection to the pupa.
The worms separate and form cocoons; the cocoon moves forward, picking up eggs at the 14th segment; at the 9th and 10th segments it picks up the sperm deposited by the other earthworm.
The caterpillars from the replaced plants were collected and reared further on artificial diet until emerging parasitoids had formed cocoons, which were then counted.
Many leeches also form a cocoon; but the males of some species have a penis that can be inserted into the female gonopore.
One group of leeches, however, does not form a cocoon; instead, the egg, surrounded by a protective membrane, is attached to the underside of the parent.
Compared with the other two parts, the anterior gland, albeit smaller, serves as a duct to transport (spinning) silk proteins that form the cocoon.
Living on an island has become a drastic form of cocooning.
When the job is done, the larva forms a cocoon, gestates, and emerges as an adult wasp.
In basic training, even before breaking down a Kalashnikov, a Russian conscript learns to twist the portyanki around his feet to form mummylike cocoons, fit for the inside of the standard-issue Russian infantry boots, made today, as they were a century ago, of blackened canvas on a sole of rawhide.
When mature, a swollen area of the epidermis called clitellum, located in particular segments, forms a cocoon in which the eggs or ova are deposited, and are then passed over the anterior segment (Edwards and Bohlen 1996).
