Camptogramma bilineata (Yellow Shell / Gestreeptje goudspanner) is a moth of the family Geometridae. The name "Geometridae" ultimately derives from Latin geometra from Greek γεωμέτρης ("geometer, earth-measurer"). This refers to the means of locomotion of the larvae or caterpillars, which lack the prolegs of other Lepidopteran caterpillars in the middle portion of the body, with only two or three pairs at each end. Equipped with appendages at both ends of the body, a caterpillar will clasp with its front legs and draw up the hind end, then clasp with the hind end (prolegs) and reach out for a new front attachment - creating the impression that it is measuring its journey. In Belgium the species is not very rare but like most of the moths they keep hiding in the vegetation during the day and so not easy to find.
Image: Testelt (BE) - 18/07/2010
© Johan Dierckx
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