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''Ceratogyrus'' is a genus of southern African theraphosid spiders, commonly called ''horned baboons'', for the foveal horn found on the peltidium in some of the species within the genus. ''Ceratogyrus'' is readily distinguished from all other African theraphosid genera by the combined presence of a retrolateral cheliceral scopula composed of plumose, stridulatory setae and the strongly procurved fovea. The fovea is typically strongly procurved and in some species surrounds a distinct protuberance. this protuberance may take the form of a simple posterior extension of the caput, a low.set plug or a prominent, discrete conical projection. All ''Ceratogyrus'' spp. possess a pale yellow anteriorly placed, transverse, sub-abdominal band. This feature is not distinct in other Harpatirinae except ''Augacephalus junodi''. The absence of dense, ventral femoral fringes on the palpi and legs I and II distinguish ''Ceratogyrus spp.'' from female ''A. junodi''. ''C. marshalli'' features the biggest horn, where it stands straight up about 1 cm. There are several probable functions for this horn: according to a study by Rick C. West in 1986, it provides an increased surface for the attachment of the dorsal dilator muscle, which aids in drawing in liquefied food into the sucking stomach at a faster rate; this way, the spider can retreat to a safe place faster. It also increases the area for the midgut diverticula to expand during times of nutrient and water availability, analogous to a camel's hump, helping it to survive in its arid habitat during droughts. ''C. darlingi'' (often still known under the obsolete name ''C. bechuanicus'') is a rather common terrarium species. ==Species== ''Ceratogyrus'' (Pocock, 1897) (synonym of Coelogenium Purcell, 1902 ) Type species: ''Ceratogyrus darlingi'' Transferred to other genera: ''Ceratogyrus ezendami'' → ''Augacephalus ezendami'' ''Ceratogyrus nigrifemur'' → ''Augacephalus nigrifemur'' ''Ceratogyrus raveni'' (Smith, 1990) → ''Pterinochilus chordatus'' In synonymy: ''Ceratogyrus bechuanicus'' (Purcell, 1902) and ''Ceratogyrus schultzei'' (Purcell, 1908) = ''Ceratogyrus darlingi'' ''Ceratogyrus cornuatus'' (De Wet & Dippenaar-Schoeman, 1991) = ''Ceratogyrus marshalli'' *''Ceratogyrus brachycephalus'' (Hewitt, 1919) — Botswana, Zimbabwe, South Africa, the () Greater Horned Baboon *''Ceratogyrus darlingi'' (Pocock, 1897) — Mozambique, Zimbabwe, the (Zimbabwean, African ) Rear Horned Baboon, Curved Horn Baboon *''Ceratogyrus dolichocephalus'' (Hewitt, 1919) — Zimbabwe *''Ceratogyrus hillyardi'' (Smith, 1990) — Malawi *''Ceratogyrus marshalli'' (Pocock, 1897) — Zimbabwe, Mozambique, the () Straight Horned Baboon *''Ceratogyrus meridionalis'' (Hirst, 1907) — Malawi, Mozambique, the (), Zimbabwe Gray Baboon *''Ceratogyrus paulseni'' (Gallon, 2005) — Republic of South Africa *''Ceratogyrus pillansi'' (Purcell, 1902) — Zimbabwe, Mozambique *''Ceratogyrus sanderi'' (Strand, 1906) — Namibia, Zimbabwe, the () Sandy Horned Baboon 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ceratogyrus」の詳細全文を読む スポンサード リンク
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