The giant burrowing cockroach is the heaviest, weighing in up to 35 g (1.2 oz) and measure up to 80 mm (3.1 in) in length. The giant cockroach is the longest, but not the heaviest, of the cockroaches, and it measures 3.5 inches. You can read about it in the second citation, and the first cockroach in the first citation.
In November 2001, researchers announced that they had found what could very well be the largest fossilized cockroach. Found in an Ohio coalmine, the fossil measures 3.5 inches long–about 2 inches larger than its modern counterpart. The Arthropleura pustulatus dates back 300 million years–around 55,000 years before the appearance dinosaurs! Proof that cockroaches have been and are some of the most resilient organisms.
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