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The Proctodaeum (from the Greek proktos = "anus, rump, butt, also rectum" and hodaios = " way- ") is a section of the arthropod that includes the rectum section and the anus . Due to its ectodermal origin, like the stomodaeum, it is lined with a cuticle made of chitin and is skinned accordingly during the moult .

In most arthropods, the Proctodaeum only forms a short, muscular end of the intestine and the anus. In the case of insects , the rectal papillae , which are well supplied with blood, are located in the Proctodaeum, they serve to reabsorb the water from the intestinal contents. In some crustaceans , especially species of woodlice (Isopoda), scissor isopods (Tanaidacea) and Cumacea , the Proctodaeum is greatly elongated and extends almost to the stomadaeum while the midgut is shifted into the midgut glands.

Individual evidence

  1. ^ Proctodaeum. In: Herder-Lexikon der Biologie. Spektrum Akademischer Verlag, Heidelberg 2003, ISBN 3-8274-0354-5 .
  2. a b c Hannes Paulus: Euarthropoda, Arthropod, ieS In: W. Westheide, R. Rieger (Ed.): Special Zoology. Part 1: Protozoa and invertebrates. Gustav Fischer, Stuttgart / Jena 1997, ISBN 3-8274-1482-2 , p. 443.