A siltstone lens within Papakaio Formation of Eocene age, near Livingstone, North Otago, has yielded a single specimen of an insect that is interpreted to be a final instar march fly larva, Dilophus campbelli n. sp., close to a common extant species, Dilophus nigrostigma (Walker) (Diptera: Bibionidae). It is the first entire prePleistocene insect fossil definitely known to have been found in New Zealand. It is also the first record of a fossil bibinoid larva. Details of geological setting are given in an appendix by J. C. Aitchison, H. J. Campbell, J. D. Campbell and J. I. Raine.
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A. C. Harris (1983) studied this question.
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