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Insects 2019, 10(3), 73; https://doi.org/10.3390/insects10030073

Morphology and Morphometry of the Midgut in the Stingless Bee Friesella schrottkyi (Hymenoptera: Apidae)

1
Department of General Biology, Universidade Federal de Viçosa, 36570-000 Viçosa, MG, Brazil
2
Instituto Federal de Mato Grosso-IFMT. Campus avançado Diamantino, 78400-970 Diamantino, MT, Brazil
*
Author to whom correspondence should be addressed.
Received: 25 January 2019 / Revised: 8 March 2019 / Accepted: 10 March 2019 / Published: 14 March 2019
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Abstract

Friesella schrottkyi is a small stingless bee (3-mm long) important for agricultural and native forest pollination. This study describes the morphology and morphometry of the midgut in F. schrottkyi forager workers. The F. schrottkyi midgut presents a single-layered epithelium with digestive, regenerative and endocrine cells. The digestive cells are similar along the entire midgut length with a spherical nucleus, apex with long striated border, cytoplasmic granules in the apical region and well-developed basal labyrinth associated with mitochondria, suggesting they are multifunctional, synthesizing digestive enzymes and peritrophic matrix compounds and absorbing nutrients. Regenerative cells are located around the basal region organized in nests with some cells with a spherical nucleus. Phe-Met-Arg-Phe-NH2-amide (FMRFamide) positive endocrine cells are restricted to the posterior midgut region, suggesting a paracrine function in the midgut. This is the first morphological description of the F. schrottkyi midgut contributing to the comprehension of the digestive process of this bee. View Full-Text
Keywords: digestive cells; digestive tract; paracrine function digestive cells; digestive tract; paracrine function
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Oliveira, A.H.; Gonçalves, W.G.; Fernandes, K.M.; Barcellos, M.S.; Sampaio, W.M.S.; Lopes, M.P.; Martins, G.F.; Serrão, J.E. Morphology and Morphometry of the Midgut in the Stingless Bee Friesella schrottkyi (Hymenoptera: Apidae). Insects 2019, 10, 73.

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