parental duties

here's one of the interesting things i learned today, from my textbook Campbell Biology:

"Compared with many other insects, giant water bugs of the genus Belostoma produce relatively few offspring, but parental protection enhances survival. Fertilization is internal, but the female then glues her fertilized eggs to the back of the male (shown here). Whereas the males of most insect species provide no parental care for their offspring, the male giant water bug carries them for days, frequently fanning water over them. This treatment helps keep the eggs moist, aerated, and free of parasites."

Also, about some Annelids:

"Among the simplest systems are those of polychaete worms (phylum Annelida). Most polychaetes have separate sexes but do not have distinct gonads; rather, the eggs and sperm develop from undifferentiated cells lining the coelom. As the gametes mature, they are released from the body wall and fill the coelom. Depending on the species, mature gametes may be shed through the excretory openings, or the swelling mass of eggs may split the body open, killing the parent and spilling the eggs into the environment."