Grant's stag beetle
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| phylum | Arthropoda | Chiasognathus grantii is a species of stag beetle found in Argentina and Chile. It is known as Darwin's beetle, Grant's stag beetle, or the Chilean stag beetle. Chiasognathus grantii is very variable in size and in the development of the jaws and exhibits a strong sexual dimorphism. Males can reach a length of 60–90 millimetres (2.4–3.5 in) including the mandibles, while females are much smaller, having a body length of 25–37 millimetres (0.98–1.46 in). The upper mandibles of the males are very robust at the base, finely serrated and longer than the body itself. The eyes are small and the antennae have a whorl of hairs at the apex. The thorax is broad and the anterior and posterior margins are densely ciliated with short pale hairs.
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| Class | Insecta | |
| order | Coleoptera | |
| superfamily | Scarabaeoidea | |
| family | Lucanidae | |
| genus | Chiasognathus | |
| species | C. grantii |
