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Lucanidae
SUMMARY
elongate robust body, up to 120mm in size. tarsi 5-5-5. mandibles of males are often very large, sometimes even branched; females generally smaller body size and smaller mandibles. Antennae very distinctive: elbowed, 10-segmented, with a comb-like 3- or 4-segmented club; club segments can not be folded togerther. elytra covers whole abdomen and is not striate.