Publications by authors named "Paulo H Rezende"

In this study, we examine the male reproductive apparatus and sperm morphology of Thaumastocoris peregrinus (Thaumastocoridae), a pest of Eucalyptus plantations, to explore its phylogenetic implications using light and transmission electron microscopy. The reproductive apparatus comprises paired testes with three follicles each, dilated efferent ducts acting as seminal vesicles, paired accessory glands, and ejaculatory duct that connects with an aedeagus. Sperm are filiform, around 465 µm long, with short, fusiform nuclei (< 6 µm) and an acrosome observable only under TEM.

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Edessinae is one of the ten subfamilies of Pentatomidae, and it is further divided into seven genera. Among these, Edessa Fabricius, 1803 is the most diverse genus, boasting around 300 species recognized for their ecological and economic significance worldwide. The inclusion of various pentatomids in the Edessa genus has led to mistakes in its taxonomy due to common morphological features and misidentifications.

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In this study, we investigated the male reproductive system and sperm morphology of Phaleria testacea using both light and transmission electron microscopy. Our findings revealed important testicular features, such as the antiparallel arrangement of sperm in the testicular cysts, limited sperm prodution in adult males, defective spermatozoa, and bodies of cellular membranes in deterioration. We also observed more spermatids per cyst than in most Tenebrionoidea.

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The sperm ultrastructure of the bean-weevil Spermophagus kuesteri (Bruchinae) was studied to verify the congruence of the new position of the subfamily within Chrysomelidae. The results indicated a positive answer to the question supporting a close relationship between Chrysomelidae and Curculionidae, a finding confirmed also by molecular data. Moreover, the sperm morphology of Divales cinctus, a member of Melyridae (Cleroidea) allowed to confirm the different sperm organization between members of this superfamily and Phytophaga (Chrysomeloidea + Curculionoidea).

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The Trichoptera, holometabolous aquatic insects found worldwide except in Antarctica, exhibit a unique feature in their sperm, which are solely nucleated (eupyrene). Current knowledge on Trichoptera sperm is limited to Old World species. To enhance our understanding of their reproductive biology and contribute to systematic discussions, we describe the male reproductive system and spermatozoa of Smicridea (Rhyacophylax) iguazu Flint, 1983 (Hydropsychidae).

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Here, we describe for the first time the sperm morphology of Tingidae (Heteroptera). They are small insects presenting lacy patterns on their pronotum and hemielytra and are exclusively phytophagous, with many economically important species. We studied five species of the tribe Tingini (Tinginae): Teleonemia scrupulosa, Vatiga illudens, Gargaphia lunulata, Leptopharsa sp.

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Taxonomic data on Coreidae have been fragmented over time and need to be revised. Likewise, data related to the development of germ cells and the features of the male reproductive system, including sperm, will contribute to understanding the biological mechanisms of reproduction and the systematics of its representatives. Aiming to provide these data, we describe the morphology of the male reproductive system and spermatozoa of Leptoglossus zonatus using light and transmission electron microscopies, respectively.

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Article Synopsis
  • Changes in harvesting methods in the early 1990s led to the Mahanarva fimbriolata becoming the dominant pest in sugarcane plantations, highlighting a need for more research on its reproductive biology.
  • This study provides a detailed description of the male reproductive system and sperm structure of M. fimbriolata using light microscopy, revealing key components like testes, vasa deferentia, and seminal vesicles.
  • The research also investigates the formation of secondary sperm bundles, suggesting that their unique structure may enhance the reproductive success of this cercopid pest.
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The sperm ultrastructure of two members of the Scraptiidae Anaspis pulicaria and A. lurida was studied. The results confirm the general organization of the sperm in the superfamily Tenebrionoidea.

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We describe the ultrastructure of the female reproductive organs of Deronectes moestus (Dytiscidae Hydroporinae). The long spermathecal duct has a simple epithelium lined internally by a thin cuticle and externally by a thick layer of muscle cells. The wide duct lumen contains electron-dense material, among which remnants of extracellular material are visible.

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The sperm morphology can provide helpful information about sexual selection, phylogeny, and the evolutionary history of a given animal group. However, there is limited or no knowledge of many taxa, especially those belonging to insects, a vast and highly diverse group. An example is the Miridae, or plant bugs, which belong to the infraorder Cimicomorpha (Heteroptera), where only three out of 17 families have published data on their sperm morphology.

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The sperm ultrastructure of a few representative species of Tenebrionoidea was studied. Two species belong to the Mordellidae ( sp.), one species to Oedemeridae (), and one species to Tenebrionidae ().

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