The biology of dragonflies (Odonata or Paraneuroptera) (1917) (20194342480)

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

Text Appearing Before Image:

IX) THE RESPIRATORY SYSTEM 187 for a respiratory function. The main-folds were quickly lost, and the beautiful and very regular formation, which we now see, has been formed by constant addition of extra lamellae. In the Sijnthemini, the most archaic of Libellulidae, these still only number twelve in a row. Fig. 78 shews diagrammatically the connection between the three main types. 4. Histology of the Rectal GUIs (fig. 83). All forms of gill have the same histological structure, with

Text Appearing After Image:

Fig. 83. Histology of the rental gill. a. t.s. through base of gill from Acschna hreviityla, Ramb. B. The same through several lamellae of Oordulephya pygmaea Selys ( X 250). bp basal pad; cm circular muscle; hb hypobranchial tissue; lam blades of lamellae, cut at different levels in the one section; pg pigmented epithelial syncytium of gill; tr tracheae. Original. only unimportant differences of detail. The gill consists of the following parts: (1) An external cuticle. This is continuous with the general intima of the hind-gut. It is excessively fine, and covers the gill on both sides. Where it turns over at the free edge of the gill, it is armed with small spines. It is quite colourless.

the biology of dragonflies odonata or paraneuroptera 1917 book illustrations dragonflies entomology insects images from internet archive

1917

University of California

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