Ultrastructure of maxillary gland of Antrobathynella stammeri (Syncarida, Malacostraca)

Journal of Morphology
Beate Steenken, Horst Kurt Schminke

Abstract

The maxillary gland of the highly adapted stygobiont species, Antrobathynella stammeri (Bathynellacea, Syncarida), consists of an end sac, an excretory tubule, and a terminal duct. No valve was found. The excretory tubule forms a loop extending back into the fourth thoracic segment. The end sac is composed of five typical podocytes. Ultrastructurally and functionally, two cell types characterize, respectively, proximal and distal sections of the excretory tubule. Epithelial cells are covered with extremely broad (up to 0.4 μm) microvilli. A basal labyrinth was not seen. Therefore, it is unlikely that the maxillary gland is able to produce a hypoosmotic urine necessary for freshwater animals. Tubule cells can be surrounded by parenchymal cells that produce numerous vesicles, suggesting possible physiological interactions between tubule cells and parenchyma. The ectodermal terminal duct is lined with cuticle and is differentiated into a pulsatile body consisting of two interconnected ampules. The first functions as a bladder. The second ampule, under muscular control, excretes the urine. Pulsatile body, looping tubule, and broad microvilli appear to be distinctive features of the bathynellacid excretory organ. © 1996 Wiley-Liss, ...Continue Reading

References

Mar 1, 1974·Journal of Morphology·D R Peterson, R F Loizzi
Feb 1, 1961·The Journal of Biophysical and Biochemical Cytology·J H LUFT
Jun 1, 1990·Journal of Morphology·Uwe Walter, Johann Wolfgang Wägele

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Citations

Jul 3, 2007·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Carolina A FreireJohn C McNamara
Dec 20, 2007·Arthropod Structure & Development·Robert R Hessler, Rolf Elofsson

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