The heaviest insect on record is an Actaeon Beetle, bred in Japan in 2009, which weighed 8 oz (228 g). That was a larva, the juvenile stage of insects. The list below includes only adults. Here are the six heaviest insects that could be verified, weighed in ounces and grams:

1. Little Barrier Giant Wētā, New Zealand: 2.5 oz (71 g)
2. Goliath Beetle, Africa: 1.4-1.7 oz (40-50 g)
3. Actaeon Beetle, South America: 1.4-1.7 oz (40-50 g)
4. Elephant Beetle, Central and South America: 1.4-1.7 oz (40-50 g)
5. Titan Beetle, South America: 1.4-1.7 oz (40-50 g)
6. Giant Burrowing Cockroach, Australia: 1.2 oz (33.45 g)