Structure and function of the foregut and salivary glands of the synanthropic diplopod Urostreptus atrobrunneus (Spirostreptidae)

in Animal Biology
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Diplopods are considered to be important macro-arthropods of the soil because they are involved in maintaining the balance of the ecosystem. Normally, they do not maintain a large population, but population explosions may occur due to environmental imbalances, climate changes and the use of pesticides that can eliminate possible competitors. The millipede Urostreptus atrobrunneus Pierozzi and Fontanetti, 2006 has infested sites in urban centers of São Paulo State, causing various problems for the human population; the lack of knowledge of this millipede’s biology has hindered efforts to efficiently control the infestation. Because of this lack of knowledge, this study aims to contribute to the understanding of this pest, describing the morphology of the foregut and salivary glands of the millipede U. atrobrunneus, and relating them to their respective functions by histological and histochemical analyses.

Structure and function of the foregut and salivary glands of the synanthropic diplopod Urostreptus atrobrunneus (Spirostreptidae)

in Animal Biology



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    Histological sections of the foregut (A, B, C, F) and transition of foregut/midgut (D, E) of Urostreptus atrobrunneus stained with haematoxylin/eosin. Abbreviations: d – duct; sg – salivary gland; h – haemocytes; f – foregut; i – cuticular intima; l – lumen; em – external membrane; m – musculature; pm – peritrophic membrane; mg – midgut; sp – secretory portion; arrows: transition foregut/midgut.

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    Histological sections of the foregut of Urostreptus atrobrunneu, submitted to staining with xilidine ponceau (A) and the techniques of PAS/Alcian blue (B) and PAS (C). Abbreviations: d – duct; e – epithelium; h – haemocytes; i – cuticular intima; l – lumen; mb – basal membrane; em – external membrane. This figure is published in colour in the online version.

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    Histological sections of the salivary gland of Urostreptus atrobrunneu, stained with haematoxylin/eosin. (A). Posterior portion of the gland; (B). Median portion of the gland; (C). Anterior portion of the gland. Abbreviations: d – duct; e – epithelium; l – lumen; sp – secretory portion.

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    Histological sections of the salivary gland of Urostreptus atrobrunneus. (A, B, C). Submitted to the bromophenol blue technique; (D). Submitted to the PAS/Alcian blue technique; (E). Submitted to the PAS technique. Abbreviations: d – duct; f – foregut; sp – secretory portion. This figure is published in colour in the online version.

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