Suction stomach
Suction stomach is the name given to enlargements of the stomach or esophagus in arthropod species that either have a suction function or where this was previously suspected.
1) With butterflies
Butterflies have a head lying in the suction pump from the cibarium and subsequent parts of the pharynx is formed by this diet can through the suction pipe are sucked (Proboscis). Historically, however, a sac-like protuberance ( diverticulum ) of the foregut in the anterior abdominal segments was called "suction stomach" instead . This structure, which is connected to the intestinal lumen by a thin channel, is air-filled in the living animal; it actually has no suction function.
2) In spiders
In spiders (Araneae), the suction stomach is part of the digestive tract, its task is to suck in the pulp that has been liquefied by extraintestinal digestion . The suction stomach lies in the prosoma , above the endosternitis , under the so-called fovea, a dorsal depression ( apodeme ) of the cuticle. The suction stomach is equipped with circular muscles at both ends, which act as valves. Its expansion takes place through a powerful dilator muscle attached to the apodeme and laterally attached muscles, the contraction through the circular muscles. The activity of the suction stomach was synchronized with the activity of the heart when a species of tarantula ( Grammastola cala ) was examined .
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- Rainer Foelix: Biology of the spiders. 2nd, revised edition. Thieme Verlag, Stuttgart 1992, ISBN 3-13-575802-8 .
- Klaus-Günter Collatz: Structure and Function of the Digestive Tract. In: Wolfgang Nentwig (Ed.): Ecophysiology of Spiders. Springer-Verlag, 1987, ISBN 3-642-71554-0 .
- Filippo de Filippi: Anatomical-physiological remarks on the insects in general and on the Bombyx mori (bombice de gelso) in particular. Continuation and conclusion. In: Stettiner Entomologische Zeitung . 14, 1853, pp. 124-132.
- SM Gaikwad, SR Aland, AB Mamlayya, GP Bhawane: Anatomy and histology of the alimentary canal of adult Papilio polyctes polyctes L. (Lepidoptera, Papilionidae). In: The Bioscan. 6 (3), 2011, pp. 399-402.