Varanus umbra, known commonly as the orange-headed rock monitor, is a species of small-bodied, rock-adapted monitor lizard endemic to Far North Queensland. It was formally described in 2026 along with its close relatives Varanus iridis and Varanus phosphoros. The three species form part of a clade which diverged from other Odatrian monitor lizards around 7 million years ago.[1][2]
Taxonomy
The specific name, 'umbra', is derived from a Latin word meaning shade or shadow in reference to its distinctive colouration meant to resemble the horizon at dusk or evoke the appearance of being cast in shadow.[1]
Description
The holotype was collected in 2023 from the type locality of Northhead. The species inhabits the sandstone outcrops and plateaux of the eastern edge of the Gregory Range, where it is known from three sites situated in open savanna woodland, although it is likely to occupy the broader Gregory Range region. The species occupies a remote habitat and its shy, secretive habits make it hard to detect.[1]
The dark brown to black reticulum forms a distinct pattern of well-spaced pale grey to buff ocelli across the nape and upper abdomen, each enclosing an orange or ochre centre. The colour of the head and nape ranges from warm golden brown to burnt orange, hence its common name. The reticulum becomes diffuse and irregular with the ocelli beginning to fade beyond the midbody. The limbs and tail are a uniform grey with obscure darker mottling, with the tail also featuring faint alternating bands of grey and darker grey–brown.[1]
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