See mojaculo, water dragon (both insect name).
In Colombia they are two of the common names we give to Odonate insects, that is to say dragonflies or devil's horses.
MOJACULES or WATER DRAGONS Name assigned to the dragonfly because when it finishes detaching the male in ovulation, she continues ovositando and for this he immerses the ovisitor in the water, which is a little nas up to the anus.