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Parascaris equorum is a species of ascarid that is the equine roundworm. Amongst horse owners, the parasites are colloquially called "Ascarids". This is a host-specific helminth intestinal parasite that can infect horses, donkeys, and zebras. Horses up to six months of age are the most susceptible to infection.
Parascaris is a genus of nematodes in the family Ascarididae. It contains two species, Parascaris equorum and Parascaris univalens , which are morphologically identical, but can be distinguished by chromosome number.
Other ascarid genera infect other animals, such as Parascaris equorum, the equine roundworm, and Toxocara and Toxascaris, which infect dogs and cats. Their eggs are deposited in feces and soil. Plants with the eggs on them infect any organism that consumes them. [2]
Karyotyping is the only way to differentiate between the two: P. univalens has one pair of chromosomes and P. equorum has two pairs. [2] However, new genomic research suggests that both Parascaris species could be the same species. [3] Both species are model organisms for chromosome organization and cell division. [4]
Other causes can be obstruction by ascarids (Parascaris equorum), usually occurring at 3–5 months of age right after deworming, and tapeworms (Anoplocephala perfoliata), which have been associated with up to 81% of ileal impactions [10] [15] (See Ascarids).
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This is the lowest number known (indeed possible) for any animal, a number shared with the parasitic roundworm Parascaris equorum univalens. [96] [97] Jack jumper ants are taxonomically discussed as a single biological species in the Myrmecia pilosula species complex. [1] [8] The ant has nine polymorphic loci, which yielded 67 alleles. [98]
Ascariasis in animals - Parascaris equorum, Toxocara vitulorum, Toxocara canis, Toxascaris leonina, and Toxocara cati; Strongyles.