Abstract
Foregut glands in Solenogastres are not only of importance in biological processes like feeding and digestion, but multicellular foregut glands also provide valuable characters for taxonomy and systematics. Here, the fine structure of four different types of foregut glands is investigated: the Meioherpia-type ventrolateral foregut gland of Meioherpia atlantica, the Simrothiella-type ventrolateral foregut gland of Simrothiella cf. margaritacea, and the Pararrhopalia-type ventrolateral foregut gland as well as the dorsal gland of Pararrhopalia pruvoti. Thereby, special focus is set on the arrangement of glandular and supporting cells within the glands, and on the characterization of glandular cells according to the size, shape and electron-density of their secretional vesicles. It is shown that the investigated glands are complex organs composed of non-glandular supporting cells and two to five glandular cell types producing discrete secretions.
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