. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 354 CHARLES T. BRUES. Die kleine Querader fehlt, well die in der Strecke ac enthalten ; This comparison is very striking and were it not for the funda- mental differences in metamorphosis and in other organs, might be conclusive. It is further strengthened by the fact adduced by Becker that certain of the macrochaetae covering the body are in both families provided with chitinous bristle-like projections. On the other hand, Schiner has with almost equal facility re- duced the Phorid wing to a more generalized type o
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 354 CHARLES T. BRUES. Die kleine Querader fehlt, well die in der Strecke ac enthalten ; This comparison is very striking and were it not for the funda- mental differences in metamorphosis and in other organs, might be conclusive. It is further strengthened by the fact adduced by Becker that certain of the macrochaetae covering the body are in both families provided with chitinous bristle-like projections. On the other hand, Schiner has with almost equal facility re- duced the Phorid wing to a more generalized type of brachy- cerous venation according to the following scheme (see Fig. 4). The main differences between this and the arrangement by Girschner lie in the interpre- tation of the fourth vein in- volving the presence of the cross-vein and the presence of the anal vein. Schiner's FIG. 4. Wing of Mora sp., as interpreted designatjon of the indistinct by Schiner. thickening along the costa beyond the tip of the heavy veins as a " Fortsetzung der ersten Langsader " I cannot exactly understand, but it involves no im- portant point. Of the two views, that of Girschner accords more closely with the actual wing venation, and will I think be partly accepted with the exception of several points mentioned on a later page, by all who will study carefully a series of wings. That this similarity between the Mycetophilid and Phorid wing involves genetic relationship does not necessarily follow, however. As suggested on a previous page, specialization of wings often fol- lows more or less parallel paths in diverse groups, and this seems to be especially true in those where a loss in com- plexity of structure is brought about by parasitism, secretive habits, or minute size. Turning to the Dipterous family Hippo- boscidae, widely removed from those previously discussed, we can see a strikingly similar condition to the one assumed by Girschner for the Phoridas. Fig. 5 shows the wing of a sp
Size: 2222px × 1124px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
