Stenodryas clavigera

It was getting dark so I was on my way home… And there it was, a tiny longhorn beetle sitting on a leaf, waiting to have its photo taken! I’d spent about 5 hours looking for longhorns and here was one I’d never found before – very exciting!! The most obvious feature of this species is its thickened black femurs (“thighs”).

Stenodryas clavigeraStenodryas clavigeraStenodryas clavigera

Coleoptera: Cerambycidae
Stenodryas clavigera
longhorn beetle = ameiro-kamikiri

Location: In orchards and bamboo/pine forest above Yokoyama Village (Google map)

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2 Responses to Stenodryas clavigera

  1. cyndi says:

    so why such big thighs? do they benefit the insect in any way?

  2. Nigel says:

    Good question!
    Some beetles (called flea beetles) have big thighs to hold the muscles they use for jumping, but this longhorn beetle does not jump (I think). Or maybe it does jump when it takes off to fly.
    I just found a scientific article suggesting that the enlarged femurs (thighs) in the males of some species of longhorn beetles hold flexor (bending) muscles rather than extensor (straightening) muscles, so the grip is stronger, which is probably related to mating…

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