Summary
The interpyramidal muscles of the lantern of Diadema setosum have been studied as an example of such muscles in regular echinoids. The light- and electron microscopic study proves that the interpyramidal muscle is nothing but a continuous, highly folded myoepithelium. Although it is a powerful and specialized comminator muscle its histological organization (a pseudostratified myoepithelium) is rather simple when compared with other echinoderm myoepithelia. It consists of only two cell types: 1) a single layer of well-developed myocytes and 2) monociliated adluminal cells that totally cover the myocytes and touch the basal lamina by thin basal processes. The interpyramidal muscle grows by addition of new folds to its upper region. Consecutive stages of the myoepithelial differentiation are found in each of the young folds. The origin of the cells which are necessarily added to the growing epithelium is unknown. The growth rate of the muscle is in accordance with the enlargement of the lantern ossicles. The respective data are discussed in detail.
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Märkel, K., Röser, U. & Stauber, M. The interpyramidal muscle of Aristotle's lantern: its myoepithelial structure and its growth (Echinodermata, Echinoida). Zoomorphology 109, 251–262 (1990). https://doi.org/10.1007/BF00312192
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DOI: https://doi.org/10.1007/BF00312192