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emerald tree monitor
The emerald tree monitor (''Varanus prasinus'') or green tree monitor, is a small to medium-sized arboreal monitor lizard. It is known for its unusual coloration, which consists of shades from green to turquoise, topped with dark, transverse dorsal banding. This coloration helps camouflage it in its arboreal habitat. Its colour also makes the emerald tree monitor highly exploited to the pet trade and kept in zoos alike.
==Taxonomy==
''V. prasinus'' was first described as ''Monitor viridis'' by John Edward Gray in 1831; however, Gray's original holotype (RMNH 4812 in the National Natural History Museum in Leiden) was lost and the species was redescribed by Schlegel eight years later as ''V. prasinus'' using the found specimen. The generic name ''Varanus'' is derived from the Arabic word ''waral'' (ورل), which translates to English as "monitor".〔 Its specific name, ''prasinus'', is Latin for the color green.
''V. prasinus'' is a member of the ''Euprepiosaurus'' subgenus. It is closely related to several other arboreal species; when combined, these are often referred to as the ''V. prasinus'' species group. In addition to ''V. prasinus'', this species group, whose members are all allopatric, includes ''V. beccarii'' (Aru Islands), ''V. boehmei'' (Waigeo Island), ''V. bogerti'' (D'Entrecasteaux Archipelago), ''V. keithhornei'' (Cape York Peninsula), ''V. kordensis'' (Biak Island), ''V. macraei'' (Batanta Island), ''V. reisingeri'' (Misool Island) and ''V. telenesetes'' (Rossel Island).〔Jacobs, H. J. (2003). ''A further new emerald tree monitor lizard of the Varanus prasinus species group from Waigeo, West Irian (Squamata: Sauria: Varanidae).'' Salamandra 39(2): 65-74〕〔Ziegler, T., A. Schmitz, A. Koch and W. Böhme (2007). ''A review of the subgenus Euprepiosaurus of Varanus (Squamata: Varanidae): morphological and molecular phylogeny, distribution and zoogeography, with an identification key for the members of the V. indicus and the V. prasinus species groups.'' Zootaxa 1472: 1-28〕
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