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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".
Young water monitor V. s. macromaculatus Closeup showing split tongue. The Asian water monitor is dark brown or blackish with yellow spots on the underside that fade gradually with age. It has blackish bands with yellow edges extending back from each eye. Its body is muscular, with long, powerful, laterally compressed tails.
Clouded monitor hatchlings by comparison tend to have a series of backward-pointing, V-shaped bands on their necks. [5] Bengal monitors have external nostril openings (nares) that is slit-like and oriented near horizontal, and positions between the eye and the tip of the snout.
The black-spotted ridge-tailed monitor (Varanus insulanicus baritji), also called commonly the black-spotted spiny-tailed monitor, the lemon-throated monitor, the northern ridge-tailed monitor, Whites monitor, and the yellow-throated monitor, is a subspecies of lizard in the family Varanidae.
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The Yuwono monitor or tricolor monitor (Varanus yuwonoi), also commonly known as the black-backed mangrove monitor or the black-backed monitor, is a species of monitor lizard in the blue-tailed monitor species complex. [2] [3] The tricolor monitor is endemic to the island of Halmahera, in the Maluku Islands, Indonesia. [4]