Epopostruma frosti - trap-jaw ant
The odd shape of this trap-jaw ant head is due primarily to two features. First, the musculature housing the trap spring mechanism favors the lobed, triangular head. Second, the deep recesses underneath the eyes allow the antennae to be retracted tightly against the head.
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This image was captured with a Canon EOS D60, using a Canon 65/2.8 MPE 1-5x Macro lens.