English:
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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10 THE IMAGO (CH. It seems fairly certain that, originally, only the first of these segments was preoral. Thus it corresponded with the prostomium of Annulate Worms, and is not strictly to be considered as an appendage-hearing segment. The mouth itself has moved from an original ventral position, to take up a place at the extreme anterior end of the head. Hence the original ventral surfaces of segments vt ant
Text Appearing After Image:
Fig. 1. Exoskeleton of head, thorax, and first two abdominal segments, A. Austrophlebia costalis Tillyard, female; dorsal view. B. The same, ventral view. C. The same, lateral view. D. Head of the same, front view. E. Head of Lestes, dorsal view. F. The same, lateral view. G. Metathorax of Orthetrum, ventral view. A analis; A' secondary analis; ac anteclypeus; alr ante-alar ridge; ant antenna; ap costal process; As urosternite; At; urotergite; ax axillary; C costa; Cu cubitus; cx coxa; dr dorsal carina; e eye; epic epicranium; epm epimerum; eps episternum; fr frons; fr1 its superior, fr2 its anterior portion; Fw fore-wing; g gena: hs humeral suture; Hw hind-wing; ips infra-episternum; ll lateral lobe of labium; lm labium; lr labrum; ls1 first, ls2 second lateral suture; M media; mb membranule; md mandible; me median eye-line; ml median lobe of labium; mt mentum; N notum; occ occiput; ocl lateral, ocm median ocellus; orb orbit; ot occipital triangle; P prothorax; pc postclypeus; Pl pleurum; PN postnotum; pol postocular lobe; PS post-sternum ; R radius; S sternum; Sc subcosta; Sp spiracle; t temple; v vertex; vt vertical tubercle, (A-D and G x2; E, F x5.3) Original.
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