Four-horned chameleon | |
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A four-horned chameleon from Mount Kupe in Cameroon | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Reptilia |
Order: | Squamata |
Suborder: | Iguania |
Family: | Chamaeleonidae |
Genus: | Trioceros |
Species: | T. quadricornis |
Binomial name | |
Trioceros quadricornis (Tornier, 1899) | |
A map illustrating highland areas of the Cameroon line, including some of those inhabited by the four-horned chameleon | |
Synonyms [2] | |
The four-horned chameleon (Trioceros quadricornis) is a species of chameleon, a lizard in the family Chamaeleonidae. The species is native to highland areas in western Cameroon and southeastern Nigeria.
The four-horned chameleon was first described in 1899 by German naturalist Gustav Tornier. There are three subspecies, including the nominate race, which are recognized as being valid. [2]
Nota bene : A trinomial authority in parentheses indicates that the subspecies was originally described in a genus other than Trioceros .
The subspecific name, eisentrauti, is in honor of German zoologist Martin Eisentraut. [3]
The four-horned chameleon is found only in some highland areas associated with the Cameroon line across Cameroon and eastern Nigeria; its range includes the Western High Plateau, the Bamboutos massif, Mount Manengouba, Oku Massif, the Bakossi Mountains including Mount Kupe, and the Obudu Plateau in Nigeria. T. q. eisentrauti in particular is endemic to the Rumpi Hills of Cameroon. [2] Overall, T. quadricornis has an extent of occurrence of 13,300 km2 (5,135 sq mi) and an inferred area of occupancy of 1,000 km2 (386 sq mi). The species is primarily associated with relatively intact montane forest with limited human activity, where it has a relatively restricted elevational range of 1,150–2,400 m (3,770–7,870 ft). Research suggests that this is likely to reflect competition with other chameleon species rather than physiological tolerances. [1] The type locality for the species is Mount Manegouba in Cameroon. [2]
Like many other chameleons, the four-horned chameleon has a prehensile tail and single claws on its toes. It usually has four prominent horns, but sometimes two are present with up to four adjacent reduced horns; [4] adults typically grow to a total length (including tail) of 10–14 in (25–36 cm). Male four-horned chameleons have a prominent hemipenal bulge and a gular beard, while some female four-horned chameleons have one horn or even two horns on the tip of the snout. [5] The species almost exclusively feeds on arthropods. [1]
Because of its small and fragmented range coupled with numerous threats to its population, the four-horned chameleon is ranked Vulnerable by the International Union for Conservation of Nature. There are concerns that logging and agricultural expansion may contribute to deforestation and potentially threaten the status of the species by degrading its habitat; in addition, despite its status as a protected Class A species in Cameroon, its intensive exploitation by the pet trade has caused significant population declines in some cases. [1]
Bradypodion is a genus of chameleons in the family Chamaeleonidae, collectively called South African dwarf chameleons. All species are found in South Africa and most are endemic to this country, but a few can also be found in Eswatini, Lesotho, southernmost Namibia and possibly southernmost Mozambique. They are quite small chameleons where the different species often can be difficult to separate by appearance, although exact location and the intense breeding colours of males are useful for their identification. They are arboreal, but some species are mostly found low in the vegetation.
Chamaeleo is a genus of chameleons in the family Chamaeleonidae. Most species of the genus Chamaeleo are found in sub-Saharan Africa, but a few species are also present in northern Africa, southern Europe, and southern Asia east to India and Sri Lanka.
Jackson's chameleon, also known as Jackson's horned chameleon, three-horned chameleon or Kikuyu three-horned chameleon, is a species of chameleon native to East Africa, and introduced to Hawaii, Florida, and California.
Kinyongia is a genus of chameleons found in montane and sub-montane areas in Kenya, Tanzania, Uganda, Rwanda, Burundi, and far eastern DR Congo. They are restricted to forests, woodlands and other wooded habitats, and many species have very small geographic ranges. In most species, at least the males have horns or knobs on their noses. As typical of most chameleons, Kinyongia are oviparous.
The Cameroonian Highlands forests, also known as the Cameroon Highlands forests, are a montane tropical moist broadleaf forest ecoregion located on the range of mountains that runs inland from the Gulf of Guinea and forms the border between Cameroon and Nigeria. This is an area of forest and grassland which has become more populous as land is cleared for agriculture.
Trioceros johnstoni, known commonly as Johnston's chameleon, Johnston's three-horned chameleon, or the Ruwenzori three-horned chameleon, is a species of chameleon, a lizard in the family Chamaeleonidae. It is endemic to highlands in the Albertine Rift in central Africa. It reaches up to 30 cm (12 in) in total length and only the adult male has three horns; females are hornless.
Trioceros is a genus of lizards in the family Chamaeleonidae, the chameleons, native to lowlands and highlands in the African mainland, ranging from Ethiopia south to Mozambique and west as far as Ghana. Trioceros was considered a subgenus of the genus Chamaeleo until 2009, when it was elevated to full genus level.
Trioceros melleri, with the common names Meller's chameleon and giant one-horned chameleon, is the largest species of chameleon from the African mainland.
The side-striped chameleon or the two-lined chameleon is a chameleon native to Ethiopia, southern Sudan, Somalia, Kenya, Tanzania, Uganda, and the northeastern Democratic Republic of the Congo.
Chamaeleoninae is the nominotypical subfamily of chameleons. The Family Chamaeleonidae was divided into two subfamilies, Brookesiinae and Chamaeleoninae, by Klaver and Böhme in 1986. Since its erection in 1986, however, the validity of this subfamily designation has been the subject of much debate, although most phylogenetic studies support the notion that the pygmy chameleons of the subfamily Brookesiinae are not a monophyletic group. While some authorities have previously preferred to use the subfamilial classification on the basis of the absence of evidence principal, these authorities later abandoned this subfamilial division, no longer recognizing any subfamilies with the family Chamaeleonidae. In 2015, however, Glaw reworked the subfamilial division by placing only the genera Brookesia and Palleon within the Brookesiinae subfamily, with all other genera being placed in Chamaeleoninae.
The crested chameleon, also known as the sail backed chameleon, is a species of chameleon native to forests and semi-open wooded habitats in Central Africa.
The Cameroon sailfin chameleon or Cameroon two-horned mountain chameleon is a species of chameleon endemic to Cameroon. It has a very unusual appearance.
Owen's chameleon, also commonly known as Owen's three-horned chameleon, is a species of lizard in the family Chamaeleonidae. The species is native to forests in central Africa. Named after British naval officer and explorer William Fitzwilliam Owen, it was first described in 1831 by the naturalist John Edward Gray, and is the type species of the genus Trioceros.
Kinyongia boehmei, the Taita blade-horned chameleon, Böhme's two-horned chameleon and Dwarf fischer's chameleon, is species of chameleon, a lizard in the family Chamaeleonidae, found only in the Taita Hills of southeastern Kenya. It is the smallest species in the East African "two-horned chameleon" group and until 2008 it was generally considered a part of K. tavetana.
Calumma guillaumeti is a species of chameleon, a lizard in the family Chamaeleonidae. The species is endemic to Madagascar.
Trioceros feae, also known commonly as the Bioko montane chameleon and Fea's chameleon, is a species of lizard in the family Chamaeleonidae. The species is endemic to the island of Bioko.
Trioceros fuelleborni, also known commonly as the flapjack chameleon, the Ngosi Volcano chameleon, and the Poroto three-horned chameleon, is a species of lizard in the family Chamaeleonidae. The species is endemic to Tanzania.
Trioceros goetzei, also known commonly as Goetze's chameleon, Goetze's whistling chameleon, and the Ilolo chameleon, is a species of lizard in the family Chamaeleonidae. The species is native to eastern Africa. There are two recognized subspecies.
Trioceros harennae, also known commonly as the Harenna hornless chameleon, is a species of lizard in the family Chamaeleonidae. The species is endemic to Ethiopia. There are two recognized subspecies.
Chamaeleo intermedius is an extinct species of chameleon from the Miocene of Kenya. It was given its name based on the fact that it shares traits with both species of the genus Chamaeleo and those of Trioceros, which at the time were placed in the same genus. This belief that it was an intermediate form was however rejected by later research.