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Parascaris
''Parascaris'' is a genus of nematodes in the family Ascarididae. It contains two species, ''Parascaris equorum ''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 zeb ...'' and '' Parascaris univalens'', which are morphologically identical, but can be distinguished by chromosome number. Both species parasitize horses. References Ascaridida Secernentea genera {{nematode-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parascaris Univalens
''Parascaris univalens'' is a parasitic ascaridoid nematode that infects the gastrointestinal tracts of equines. Taxonomy ''P. univalens'' is morphologically identical to ''Parascaris equorum'', the only other species in the genus. The species are distinguished by the number of chromosomes. Karyotyping is the only way to differentiate between the two: ''P. univalens'' has one pair of chromosomes and ''P. equorum'' has two pairs. However, new genomic research suggests that both ''Parascaris'' species could be the same species. Both species are model organisms for chromosome organization and cell division. Description The species is yellow-white in color, with adults having a long body and a broad anterior end that has three shamrock-like lips. Adult females can reach up to 50 cm in length and be 1–2 cm round. As with other ascarid worms, ''P. univalens'' is known to increase in size as it ages. These worms are host-specific to equines and cannot infect humans or ot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parascaris Equorum
''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. After this time, infection rates begin to decline and is extremely uncommon in horses over twelve months of age. It cannot infect humans or other animals. It is yellow-white in color, and females can become as large as in length. Found worldwide, ''P. equorum'' is one of the most difficult equine parasites to kill, requiring larger doses of more powerful anthelmintic medications than are needed for other equine parasites. Life cycle ''P. equorum'' is sexually dimorphic, the females are significantly larger than males. While males only grow up to 15–28 cm in length, the females can grow up to 50 cm in length. They are a white colored, cylindrical worm a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ascarididae
The Ascarididae are a family of the large intestinal roundworms. Members of the family are intestinal parasites, infecting all classes of vertebrates. It includes a number of genera,Anderson RC (2000)''Nematode Parasites of Vertebrates. Their Development and Transmission, 2nd ed.''CAB International, Wallingford, Oxon, UK, pp. 245-315. the most well known of which are: *'' Amplicaecum'' *'' Angusticaecum'' *''Ascaris'' *†'' Ascarites'' (fossil)Poinar Jr, G. and Boucot, A. J. (2006) Evidence of intestinal parasites of dinosaurs. ''Parasitology'', 133: 245-249. *''Baylisascaris'' *'' Crossophorus'' *'' Dujardinascaris'' *''Hexametra'' *'' Lagochilascaris'' *'' Ophidascaris'' *''Parascaris'' *'' Polydelphis'' *'' Seuratascaris'' *''Toxascaris'' *''Toxocara'' *'' Travassoascaris'' ''Ascaris lumbricoides'' is the main ascarid parasite of humans, causing ascariasis Ascariasis is a disease caused by the parasitic roundworm ''Ascaris lumbricoides''. Infections have no sympto ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Nematodes
The nematodes ( or grc-gre, Νηματώδη; la, Nematoda) or roundworms constitute the phylum Nematoda (also called Nemathelminthes), with plant-parasitic nematodes also known as eelworms. They are a diverse animal phylum inhabiting a broad range of environments. Less formally, they are categorized as Helminths, but are taxonomically classified along with arthropods, tardigrades and other moulting animals in the clade Ecdysozoa, and unlike flatworms, have tubular digestive systems with openings at both ends. Like tardigrades, they have a reduced number of Hox genes, but their sister phylum Nematomorpha has kept the ancestral protostome Hox genotype, which shows that the reduction has occurred within the nematode phylum. Nematode species can be difficult to distinguish from one another. Consequently, estimates of the number of nematode species described to date vary by author and may change rapidly over time. A 2013 survey of animal biodiversity published in the mega jo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ascaridida
The order Ascaridida includes several families of parasitic roundworms with three "lips" on the anterior end. They were formerly placed in the subclass Rhabditia by some, but morphological and DNA sequence data rather unequivocally assign them to the Spiruria. The Oxyurida and Rhigonematida are occasionally placed in the Ascaridida as superfamily Oxyuroidea, but while they seem indeed to be Spiruria, they are not as close to ''Ascaris'' as such a treatment would place them.Tree of Life Web Project (ToL) (2002)Nematoda Version of 2002-JAN-01. Retrieved 2008-NOV-02. These "worms" contain a number of important parasites of humans and domestic animals. Important families include: * The Anisakidae are also called the "marine mammal ascarids". The larvae of these worms cause anisakiasis when ingested by humans in raw or insufficiently cooked fish, but do not reproduce in humans. * The Ascarididae include the giant intestinal roundworms (''Ascaris'' spp.). * The Cosmocercidae include ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
