noun, plural: ascarids
A nematode belonging to the family Ascarididae
Ascarids are the roundworms of the family Ascarididae. Ascarididae are a family of roundworms that are usually found living in the intestines of vertebrate hosts.1 They belong to the Order Ascaridida (of Class Secernentea) of Phylum Nematoda. One of the well-known genera of the Ascarididae family is the Ascaris.
A genus of nematode worms, including the species of roundworm that can infect the intestines of humans and swine. Members of this genus resemble earthworms and have three-lipped mouths. For instance, Ascaris lumbricoides is a parasitic gut dwelling nematode worm, of major medical significance, used in developmental studies. Another is the ascarid of pigs, particularly Ascaris suum. A. suum is a species of parasitic nematode usually found in domestic pigs and a few other animals. Human infection can also occur, presumably as result of handling pig manure, and can lead to intestinal obstruction. Ascaris equorum is a large heavy-bodied ascarid nematode extremely common in the small intestine of horses and other equids. Larvae may develop in man or mice, but do not reach the adult stage.
1 Okulewicz, A. & Lonc, E. (2001). "New/old opinions on the systematics and phylogenesis of the nematodes, with the special regard to Ascaridida, Ascaridoidea". Wiad Parazytol. 47 (3): 263–268.