Gyrostigma
Encyclopedia
Gyrostigma is a genus of botfly
Botfly
A botfly is any fly in the family Oestridae, which includes all the members of the former families Cuterebridae, Gasterophilidae, and Hypodermatidae. It is the only family of flies whose larvae live as obligate parasites within the bodies of mammals, with the exception of a few screwworm flies in...

 which parasitize rhinoceros
Rhinoceros
Rhinoceros , also known as rhino, is a group of five extant species of odd-toed ungulates in the family Rhinocerotidae. Two of these species are native to Africa and three to southern Asia....

es. The best-known species is Gyrostigma rhinocerontis
Gyrostigma rhinocerontis
Gyrostigma rhinocerontis is the largest fly species known in Africa. It is a parasite of the Black Rhinoceros and the White Rhinoceros....

, the rhinoceros stomach botfly, which develops in the stomach lining of the Black Rhinoceros
Black Rhinoceros
The Black Rhinoceros or Hook-lipped Rhinoceros , is a species of rhinoceros, native to the eastern and central areas of Africa including Kenya, Tanzania, Cameroon, South Africa, Namibia, Zimbabwe, and Angola...

 and White Rhinoceros
White Rhinoceros
The White Rhinoceros or Square-lipped rhinoceros is one of the five species of rhinoceros that still exist. It has a wide mouth used for grazing and is the most social of all rhino species...

 of Africa, and the adult of which is the largest fly known in Africa.

Two other species are known. G. conjungens was discovered in the stomach of a Kenyan Black Rhinoceros in 1901, but has not been observed since 1961. The other is G. sumatrensis, which was found in a captive Sumatran Rhinoceros
Sumatran Rhinoceros
The Sumatran Rhinoceros is a member of the family Rhinocerotidae and one of five extant rhinoceroses. It is the only extant species of the genus Dicerorhinus. It is the smallest rhinoceros, although is still a large mammal. This rhino stands high at the shoulder, with a head-and-body length of ...

in 1884 but has not been observed since. Due to the difficulty of observing these short-lived flies, it is possible that there are other species corresponding to the other species of rhinoceros, but they remain undescribed. It is also possible that several species of Gyrostigma are extinct because rhinoceros populations are tiny owing to their state of endangerment.
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