Long cylindrical, shaped like an earthworm, pink or reddish when alive and white after death; There are fine horizontal stripes and two obvious lateral cords on the body surface. It is the largest parasitic nematode.
Brief introduction of ascaris lumbricoides
The female worm is about 20-35cm long, and the tail is blunt and round. The male worm 15-3 1cm, and the tail curls towards the ventral surface. It is the largest parasitic intestinal nematode, with a long cylindrical body and a slightly thinner head and tail, which looks like an earthworm.
The live worms are pink or light yellow, with thin horizontal stripes and two obvious lateral cords on the body surface. The mouth hole is located at the top of the worm, and there are three zigzagged lips around it.
One back lip is bigger, and the two belly lips are slightly smaller. The inner edge of the lip has fine teeth and the outer edge has nipples. The rectum is short, and the end of the digestive tract of female worms opens to the anus, while that of male worms opens to the cloaca.
Female worms are about 20-35 cm long, and individual worms can reach 49 cm, with a diameter of about 3-6 mm at the widest point and a blunt tail. The female reproductive system is a double tube, coiled in the protocorm of the back 2/3 of the worm, and the vulva is located on the ventral surface of the front middle 1/3 junction of the worm.
The length of the male worm is about 15-3 1cm, the diameter at the widest point is 2-4mm, and the tail end curls towards the ventral surface. The male reproductive system is a single tube, coiled in the protocorm of the second half of the worm. It has a pair of ivory-shaped mating spines, and there are many pairs of mastoids in the cloaca.