Heteronyx oblongus is a species of beetle of the family Scarabaeidae. It is found in Australia (Western Australia, South Australia, New South Wales, Australian Capital Territory, Victoria, Tasmania).
Description Adults reach a length of about . The discs of the head, pronotum and elytra are dark castaneous to black. The pronotum has a shining band without punctures along the posterior margin. The pygidium is shining and punctured.
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