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The 'oldest known fly'—a lesson in caution
Creation Archive > Volume 14 Issue 3 > The 'oldest known fly'—a lesson in caution
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 | First published: Creation 14(3):6 June 1992 |  |
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Evolutionists generally believe that insects with two wings have evolved from the ‘more primitive’ or ‘unspecialized’ four-winged condition. If pressed for evidence, they would generally refer to the fossil of ‘the oldest known fly’—a specimen called Permotipula.
‘Archaeopteryx Of The Flies’
Though not quite as
widely known as
other alleged ‘links’, Permotipula has nevertheless achieved
quite a status as a
definite ‘in-between form’. It was discovered in Australia more than
50 years
ago.1 However, all that it consisted of was a single wing,
which was subsequently lost. Its name comes from the fact that it was found in
Permian rock and was believed to be comparable to the wing of the familiar dipterous
(two-winged)
craneflies Tipulidae. In subsequent works dealing with the evolution of
insects,2,3 we find quotations
referring to Permotipula—yet this one
fossil wing has curiously ‘metamorphosed’ in the literature into
the remains of an insect with four wings. Thus, it became enshrined as a four-winged
ancestor of the two-winged flies
and midges of modern times (Diptera).
Embarrasing Rediscovery
However, the fossil has heen rediscovered —in the British Museum. A fresh study of the wing venation (the arrangement of veins) has shown that one character which was believed to be indicative of a close relalionship to the Diptera is absent, and that ‘Permotipula cannot be one of the direct ancestors of the recent Diptera’.4 Not only that, but it is of course painfully obvious that a single wing cannot, in any case, be trumpeted as proof that its owner had four.
All this goes to show how cautious one must be whenever a discovery of an ‘unspecialized ancestor’ of some animal or plant is hailed in the literature.
References
- Tillyard, R.J., in Nature, p. 778, 1929 (quoted in Tillyard, ‘The ancestors of Diptera’, Nature, 139, 1937). Return to text.
- Henning, W., Insect Phylogeny, Chichester, New York, 1981. Return to text.
- Rohdendorf, B.B., The Historical Development of Diptera, Edmonton, 1974. Return to text.
- WillMann, R., ’Rediscovered: Permotipula patricia, the oldest known fly’, Naturwissenschaften 76, 375-377, 1989. Return to text.
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