Coxal gland
Coxal glands (coxalnephridia) are excretory organs of the Euchelicerata ( arachnids and swordtails ), which have developed from the segmental metanephridia that were originally found in arthropods . Their exits are at the coxae (hips) of the walking legs, hence the name. Coxal glands occur in one or two segments of the front body.
In the crustaceans, the coxal glands correspond to the antennae and maxillary glands, which only open at the appropriate points in the head area. For original antennata like the Chilopoda and Symphyla 2 pairs of maxillary glands are assumed, for the Dipolopoda these were reduced to one pair. The original insects also have a pair of maxillary glands that open into the second maxilla , here called the labium . In more developed insects, the salivary glands probably developed from these .
literature
- Hannes Paulus: Arthropoda, Arthropod In: W. Westheide, R. Rieger (Ed.): Special Zoology. Part 1: Protozoa and invertebrates. Gustav Fischer Verlag, Stuttgart / Jena 1997, ISBN 3-437-20515-3 , p. 417.