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The black roughneck is a medium to large monitor. It usually reaches an average adult size of 3–4 ft. (90–120 cm), with a maximum length of 5 feet (150 cm), reported. [8] The black rough-necked monitor can be easily recognized by large pointed scales adorning the necks of adults. [4]
The black rough-necked monitor (V. rudicollis) was previously in the closely related subgenus Empagusia, but genomic analyses show it is actually the basalmost member of Soterosaurus, having split from the V. salvator species complex (which is composed of all the other Southeast Asian water monitor species) 14 million years ago during the middle Miocene.
The generic name Varanus is derived from the Arabic word ورل waral [Standard Arabic] / ورر warar [colloquially] / ورن waran [colloquially], from a common Semitic root ouran, waran, warar or waral, meaning "lizard beast".
The colouration of V. keithhornei is dark black on the upper side. It has moderately big and smooth head scales. Its tail has no visible keel. [6] The canopy goanna is small for a monitor lizard, reaching a total length up to 77 cm, [9] but more robust than other species of the V. prasinus species complex, and can be further distinguished from them by its colour and the conical throat scales.
The preferred natural habitat of Spencer's goanna is grassland. [1]Living in black soil plains with no trees, Spencer's goanna is the only Australian monitor that does not readily climb, although juvenile animals will climb given the opportunity.
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The lace monitor is the second-largest of all goannas, reaching lengths up to 2 m (6.6 ft). Other more common tree goannas, such as the Timor tree monitor ( V. timorensis ) and mournful tree monitor ( V. tristis ,) do not grow to quite such lengths, typically a maximum of 61 cm, nose-to-tail.