. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. Fig. 48. Dental folds of larval gizzards in Odonata. a. One major and one minor fold from gizzard of Diphlebia lestoides Selys. b. The same from Caliagrion hillinghursti Martin. c. The same from Ischnura heterosticta Burm. D. The same from Synlestes weyersi Selys. e. The same from Austro- lestes analis'Reixnh. F. Complete dentition of Peta7wragrigran/ea Leach, o. Two folds from Hemigo7nphus heterocUtus Selys. h. The same from Aiislroaeschna muUipunctatu Martin, j. The same from Anax pajmensis Burm. K. The same from Cordule
. The biology of dragonflies (Odonata or Paraneuroptera). Dragon-flies. Fig. 48. Dental folds of larval gizzards in Odonata. a. One major and one minor fold from gizzard of Diphlebia lestoides Selys. b. The same from Caliagrion hillinghursti Martin. c. The same from Ischnura heterosticta Burm. D. The same from Synlestes weyersi Selys. e. The same from Austro- lestes analis'Reixnh. F. Complete dentition of Peta7wragrigran/ea Leach, o. Two folds from Hemigo7nphus heterocUtus Selys. h. The same from Aiislroaeschna muUipunctatu Martin, j. The same from Anax pajmensis Burm. K. The same from Cordulegaster annulatus Latr. l. The same from Cordulephya pygmaea Selys. k. after Ris; the rest original, chitin preparations. Many beautiful speciaUzations of the teeth may be briefly noted. In the Zygoptera, the archaic sixteen-fold gizzard is found (with occasional reductions to fourteen or less, and in a few cases to eight) throughout the Calopterygidae and all the Agrionidae, except the Platycneminae and Agrioninae, where the minor folds become exces- sively reduced, while the major folds develop the specialized dentition shewTi in fig. 48 c. In the Lestinae there are only eight folds, four. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Tillyard, Robin John, 1881-1937. Cambridge [Eng. ] : University Press
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