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Ultrastructure of the midgut endocrine cells in Melipona quadrifasciata anthidioides (Hymenoptera, Apidae)

Author(s): Neves C. A. | Gitirana L. B. | Serrão J. E.

Journal: Brazilian Journal of Biology
ISSN 1519-6984

Volume: 63;
Issue: 4;
Start page: 683;
Date: 2003;
Original page

Keywords: insect midgut | endocrine cells | ultrastructure | secretory granules | stingless bee

In this study we describe the ultrastructure of the endocrine cells observed in the midgut of M. quadrifasciata anthidioides. This bee has two types of endocrine cells, which are numerous on the posterior midgut region. Cells of the closed type are smaller and have irregular secretory granules with lower electrondensity than those of the open cell type. The open cell type has elongated mitochondria mainly on the basal area, where most of the secretory granules are also found. Besides the secretion granules and mitochondria, endocrine cells in this species have well-developed autophagic vacuoles and Golgi complex elements.
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