Gasterophilus haemorrhoidalis
Encyclopedia
Gasterophilus haemorrhoidalis (also called nose bot) is a species of the genus
Gasterophilus
that lays eggs on the lips and around the mouth of horse
s, mule
s and donkey
, but also reindeer
.
In equidae
, third-stage larvae attach to the stomach, but also to rectum, sometimes in great numbers. Heavy infestation can cause anal prolapse
in foals and mules.
In reindeer, the larvae grow in the sinuses and throat of the host animal, and are sneezed out in the spring.
They do not parasitise humans.
Genus
In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...
Gasterophilus
Gasterophilus
Gasterophilus is a genus of parasitic flies in the family Oestridae which includes the horse bot flies. They lay eggs on horses, caribou, donkeys, and similar animals, usually equines. The eggs are laid depending on the species of gasterophilus. There are two species - Gasterophilus nasalis, and...
that lays eggs on the lips and around the mouth of horse
Horse
The horse is one of two extant subspecies of Equus ferus, or the wild horse. It is a single-hooved mammal belonging to the taxonomic family Equidae. The horse has evolved over the past 45 to 55 million years from a small multi-toed creature into the large, single-toed animal of today...
s, mule
Mule
A mule is the offspring of a male donkey and a female horse. Horses and donkeys are different species, with different numbers of chromosomes. Of the two F1 hybrids between these two species, a mule is easier to obtain than a hinny...
s and donkey
Donkey
The donkey or ass, Equus africanus asinus, is a domesticated member of the Equidae or horse family. The wild ancestor of the donkey is the African Wild Ass, E...
, but also reindeer
Reindeer
The reindeer , also known as the caribou in North America, is a deer from the Arctic and Subarctic, including both resident and migratory populations. While overall widespread and numerous, some of its subspecies are rare and one has already gone extinct.Reindeer vary considerably in color and size...
.
In equidae
Equidae
Equidae is the taxonomic family of horses and related animals, including the extant horses, donkeys, and zebras, and many other species known only from fossils. All extant species are in the genus Equus...
, third-stage larvae attach to the stomach, but also to rectum, sometimes in great numbers. Heavy infestation can cause anal prolapse
Prolapse
Prolapse literally means "to fall out of place", from the Latin prolabi meaning "to fall out". In medicine, prolapse is a condition where organs, such as the uterus, fall down or slip out of place. It is used for organs protruding through the vagina or the rectum or for the misalignment of the...
in foals and mules.
In reindeer, the larvae grow in the sinuses and throat of the host animal, and are sneezed out in the spring.
They do not parasitise humans.