Four-horned chameleon

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Four-horned chameleon
Bonn zoological bulletin - Trioceros quadricornis.jpg
A four-horned chameleon from Mount Kupe in Cameroon
Scientific classification OOjs UI icon edit-ltr.svg
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)
Cameroon line.svg
A map illustrating highland areas of the Cameroon line, including some of those inhabited by the four-horned chameleon
Synonyms [2]
  • Chamaeleo quadricornis
    Tornier, 1899
  • Chamaeleo (Trioceros) quadricornis
    Klaver & Böhme, 1986
  • Trioceros quadricornis
    Tilbury & Tolley, 2009

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.

Contents

Taxonomy and subspecies

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 .

Etymology

The subspecific name, eisentrauti, is in honor of German zoologist Martin Eisentraut. [3]

Distribution and habitat

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]

A female four-horned chameleon of the subspecies T. q. eisentrauti Bonn zoological bulletin - Trioceros eisentrauti (female).jpg
A female four-horned chameleon of the subspecies T. q. eisentrauti

Description and behavior

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]

Conservation and threats

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]

Related Research Articles

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<i>Chamaeleo</i> Genus of lizards

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.

<span class="mw-page-title-main">Jackson's chameleon</span> Species of lizard

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<i>Kinyongia</i> Genus of lizards

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<span class="mw-page-title-main">Cameroonian Highlands forests</span>

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.

<i>Trioceros johnstoni</i> Species of lizard

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.

<i>Trioceros</i> Genus of lizards

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.

<span class="mw-page-title-main">Meller's chameleon</span> Species of lizard

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<span class="mw-page-title-main">Crested chameleon</span> Species of lizard

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<span class="mw-page-title-main">Cameroon sailfin chameleon</span> Species of lizard

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<span class="mw-page-title-main">Owen's chameleon</span> Species of lizard

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.

<i>Kinyongia boehmei</i> Species of lizard

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<i>Calumma guillaumeti</i> Species of lizard

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<i>Chamaeleo intermedius</i> Extinct species of chameleon

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.

References

  1. 1 2 3 4 Anderson, C.V.; Gonwouo, N.L. (2015). "Four-horned Chameleon, Trioceros quadricornis ". The IUCN Red List of Threatened Species. International Union for Conservation of Nature and Natural Resources. Retrieved 10 November 2018.
  2. 1 2 3 4 Uetz, P.; Freed, P. "Trioceros quadricornis (TORNIER, 1899)". The Reptile Database. Retrieved 11 November 2018.
  3. Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN   978-1-4214-0135-5. (Trioceros eisentrauti, p. 81).
  4. Chirio, Laurent; LeBreton, Matthew (2007). Atlas des reptiles du Cameroun. Patrimoines naturels. Vol. 67. Paris: Muséum national d'Histoire naturelle. ISBN   9782856536032. OCLC   470695165.
  5. Davison, Linda (December 2011). "Four-Horned Chameleons". Reptiles Magazine. Chewy, Inc. Retrieved 11 November 2018.

Further reading