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An Investigation of Evolution in Chrysomelid Beetles of the Genus Leptinotarsa

An Investigation of Evolution in Chrysomelid Beetles of the Genus Leptinotarsa


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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1906 edition. Excerpt: ...for Coleoptera in general. That is, the color pattern begins in a series of metamerically placed centers, and from these spreads out. This color development is represented on plate 20 as found on the ventral surface of the segments of undecimlineata (figs. 6 to 10) and of oblongata (figs. 1 to 5). In the figures given both have a similar initial stage in which the general pattern on the segments is a pale yellow-white hypodermal color, with the initial appearance of cuticula color on the anterior segments in the inner and outer sternal centers, although the middle sternal center lags somewhat behind the others (figs. 2 and 7). A difference between the two species may now be easily seen. In L. undecimlineata color spreads from the centers peripherally (fig. 8) until very soon dark bands are found completely across the anterior half of the segment, and these later extend caudalward and over the entire segment. In oblongata, however, color does not extend beyond the centers to any great extent, the modifications being limited to the fusions of centers shown in figs. 2 to 5. 'As far as changes in the cuticula color are concerned both species pass through essentially the same stages. The pleural and tergal portions of the segments show exactly the same phenomena of color development as those found on the sternae. These are represented in side view in these two species in figs. 11 to 20. Upon all parts of the abdominal segments the centers of coloration found in the corresponding segments of the Iarv: e are preserved; and although in the adult these centers may fuse to form a unicolorous surface, the fact that in ontogeny it is in these centers that color first appears indicates that they are of great persistence as color units. On the last two...


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Product Details
  • ISBN-13: 9781154749069
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 136
  • Spine Width: 7 mm
  • Width: 189 mm
  • ISBN-10: 1154749061
  • Publisher Date: 01 Apr 2013
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 254 gr


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