Heteronyx rectangulus is a species of beetle of the family Scarabaeidae. It is found in Australia (South Australia).
Description Adults reach a length of about . They are castaneous, with the frons, pronotum and elytra shining. The pronotum is sparsely punctured with long setae and the apices of the elytra have a fringe of long, yellowish spines. The upper half of the pygidium is dull, while the rest is shining. The propygidium is pale yellowish brown.
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