| Mascaraneus | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Subphylum: | Chelicerata |
| Class: | Arachnida |
| Order: | Araneae |
| Infraorder: | Mygalomorphae |
| Family: | Theraphosidae |
| Genus: | Mascaraneus Gallon, 2005 [1] |
| Species: | M. remotus |
| Binomial name | |
| Mascaraneus remotus Gallon, 2005 | |
Mascaraneus is a monotypic genus of African tarantulas containing the single species, Mascaraneus remotus. It was first described by R. C. Gallon in 2005, [2] and is endemic to Serpent Island, Mauritius. [1]
The genus and species were first described by Richard Gallon in 2005. [1] The genus name "Mascaraneus" means "spider of the Mascarene Islands"; mixing the word "Mascarene" with the Latin word for "spider" araneus. The specific name remotus is derived from the Latin word for "remote", referring to the isolated type locality (Serpent Island). [2]
The holotype of Mascaraneus remotus is desiccated, missing the third right leg. It lacks any stridulatory setae, and was therefore considered as ischnocoline but was not placed there, on account of the lack of any medial and proximal hairs on the tibial leg sections, and the presence of integral tarsal scopulae. [2]
An interesting feature of Mascaraneus remotus is the lack of any stridulatory organ on the upper prolateral surfaces of the first two coxae of the legs. Such an organ, consisting of many robust setae and long plumose setae, is found on nearly every eumenophorine theraphosid (with the exception being Monocentropus that only has plumose setae).
As a near constant rule, large terrestrial theraphosids have a stridulatory organs of some shape or form. It has been suggested by some (for example, James Wood-Mason, in 1877 [3] ) that this is used to deter predators. The tiny islet of Serpent Island has only one type of mammal, bats, and the birds of the islet are all diurnal (active by day), therefore they rarely come into contact with the tarantula. This may have led to the lack of the stridulatory organ. [2]
Mascaraneus remotus is thought to have come from Madagascar, as during the Pleistocene age the Mascarene Plateau was exposed, with sea level rise, island hopping and local extinction causing its current distribution on the islet of Serpent Island. Another theory is that it came from Eastern Africa, but this is unlikely, as then one would expect eumenophorine tarantulas distributed on the Seychelles, from which only ischnocoline theraphosids are known. Furthermore, several species of Eumenophorinae are found on Madagascar, providing more evidence for the former theory. [2]
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Neischnocolus is a genus of spiders in the family Theraphosidae. It was first described in 1925 by Petrunkevitch. The genus Ami was separately described in 2008, but was later discovered to be a junior synonym of Neischnocolus. Species are native to Central America and northern South America.
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Bacillochilus is a monotypic genus of African tarantulas containing the single species, Bacillochilus xenostridulans. The genus and sole species were both described by R. C. Gallon in 2010, and is found in Angola. The name is a combination of the Ancient Greek "xénos" (ξενος), meaning "foreign" or "strange", and the Latin "stridulere", meaning "to creak". It is a reference to the unusual form of the stridulatory organ that distinguishes it from other members of the subfamily Harpactirinae.
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