Six species of theobscura group of the genusDrosophila occur in England. They are morphologically very similar, but do not interbreed. The most satisfactory way of distinguishing between them appears to be the shape of the male genital arch, and the female ovipositor lamellae, as well as the length of the male tarsal combs, the shape of the palps, and the proportion of the 3rd costal segment of the wing which is covered by long bristles. A separate key for the males and females is given, with illustrations, to show the differences between the six species.
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(Demerec) Dyson-hudson, V.R. Key to the british species ofdrosophila of the Obscura species-group. J Genet 52, 555 (1954). https://doi.org/10.1007/BF02985080
- Median Process
- Abdominal Tergite
- External Process
- Longitudinal Stripe