Nitrogen excretion
Terrestrial insects excrete waste products as uric acid or certain of its salts called
urates, which were water insoluble and requires less amount of water for waste product
removal. This type of excretion is known as
uricotelism
. In aquatic insects ammonia is the
excretory product, which is freely soluble in water and requires more amount of water for
waste product removal. This type of excretion is known as
ammonotelism
.
Cryptonephry
The distal ends of the Malpighian tubules are held in contact with the rectal wall by
the perinephric membrane, which is concerned either with efficient
Dostları ilə paylaş: 
