Ceratogyrus

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Ceratogyrus
Caratogyrus darlingi exuvia.jpg
Ceratogyrus darlingi
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Araneae
Infraorder: Mygalomorphae
Family: Theraphosidae
Genus: Ceratogyrus
Pocock, 1897 [1]
Species

10, species text.

Synonyms [1]

CoelogeniumPurcell, 1902

Ceratogyrus dolichocephalus Ceratogyrus dolichocephalus2.jpeg
Ceratogyrus dolichocephalus

Ceratogyrus is a genus of tarantulas found in southern Africa. [1] They are commonly called horned baboons for the foveal horn found on the peltidium in some species.

Contents

Diagnosis

They are readily distinguished from 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 species 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 .

Horn function

The horn of  C. marshalli  stands straight up about 1 cm in an adult. 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.

Species

As of July 2022, the World Spider Catalog accepted the following species: [1]

In synonymy
Transferred to other genera

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<i>Ceratogyrus marshalli</i> Species of tarantula

Ceratogyrus marshalli, also known as Straight Horned Baboon or Great Horned Baboon Tarantula, is a species of tarantula from the genus Ceratogyrus. It is found in Zimbabwe and Mozambique. It was first described by Reginald Innes Pocock in 1897, as half of the Ceratogyrus genus, they own a impressive horn in the carapace.

References

  1. 1 2 3 4 "Gen. Ceratogyrus Pocock, 1897", World Spider Catalog, Natural History Museum Bern, retrieved 2016-05-20