File:The biology of dragonflies (Odonata or Paraneuroptera) (1917) (20355980626).jpg

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Title: The biology of dragonflies (Odonata or Paraneuroptera)
Identifier: biologyofdragonf00till (find matches)
Year: 1917 (1910s)
Authors: Tillyard, Robin John, 1881-1937
Subjects: Dragon-flies
Publisher: Cambridge (Eng. ) : University Press
Contributing Library: University of California Libraries
Digitizing Sponsor: Internet Archive

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II) EXTERNAL FEATURES AND SKELETON 15 foramen. It slants upwards and backwards. Hence the oesopha- gus, in running forward towards the mouth, passes downwards along this foramen. The brain lies above the oesophagus, between the supporting endosternites of the tentorium. From it the two circum-oesophageal commissures pass downwards, encircling the oesophagus, to join the sub-oesophageal ganglion, which lies below the tentorial foramen. The Appendages of the The Antennae. These are placed epicranium (fig. 1, ant; fig. 2). Each has its base inserted into a small pit or hollow, the torulus. The antenna itself is always short, and is formed of from three to seven joints. The latter is the usual number. In the Gomphinae the number of joints does not exceed four. The first or basal joint is called the scape; it is short and thick. The second joint or pedicel is longer, and only slightly thickened. The remaining joints or distalia are very slender. The com- jDarative lengths of the joints vary in different genera. In Calopteryx and Synlestes, the pedicel becomes hyper- trophied, so as to equal or even exceed in length all the other joints put together. Fig. 2 shews a number of different types of Odonate antennae. The sensory function of these organs is very poorly developed in all Dragonflies (see chap, vii). The Mandibles (fig. 3). These are very strong, thick, unjointed appendages, hinged to the head-capsule by a true ginglymus articulation. Viewed extern- ally they are somewhat pear-shaped, the pointed distal end representing the
Text Appearing After Image:
Fig. 2. Various foi'ms of an- tennae. A. Acschna brevi- styla Ramb., imago. B. Austrogomjihus ochraceus Selys, imago, c. Tlie same, larva. d. Hemigomphus heteroclitus Selys, larva. E. Neosticta canescens Till- yard, at metamorphosis. F. Synlestes iveyersi Selys, imago. G. The same, larva, rfi to fZj distalia; ped pedi- cel; sc scape. (All figures X n.) Original. stalk of the pear. The

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  • bookid:biologyofdragonf00till
  • bookyear:1917
  • bookdecade:1910
  • bookcentury:1900
  • bookauthor:Tillyard_Robin_John_1881_1937
  • booksubject:Dragon_flies
  • bookpublisher:Cambridge_Eng_University_Press
  • bookcontributor:University_of_California_Libraries
  • booksponsor:Internet_Archive
  • bookleafnumber:35
  • bookcollection:cdl
  • bookcollection:americana
  • BHL Collection
Flickr posted date
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7 August 2015

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