The spermathecal duct of earwig Doru luteipes (Dermaptera: Forficulidae) contributes to spermatozoa survival
Keywords:
secretion, spermatozoa, viability, matingAbstract
The spermatheca of female insects is responsible for storing spermatozoa until fertilization. In Dermaptera, there are anatomical data for the spermatheca, but the histology is still unknown. This study describes the anatomy, histology, and hystochemistry of the Doru luteipes (Scudder) (Dermaptera: Forficulidae) spermatheca. The D. luteipes spermatheca is a single structure with an enlargement (reservoir) opening through a sinuous duct. The epithelial cells of the reservoir, and those of the duct, are different throughout the organ. These cells are rich in neutral polysaccharides, glycoconjugates, and proteins, indicating that the secretions function in the maintenance of spermatozoa viability. Muscles occur both in the reservoir and the duct, an uncommon feature in the spermatheca of other insects. This is the first histological description of the D. luteipes spermatheca, showing that both the duct and reservoir epithelial cells contribute compounds to maintain the spermatozoa.
Sumário
Nas fêmeas dos insetos, as espermatecas são órgãos responsáveis pelo estoque dos espermatozoides até a fertilização. Em Dermaptera, há dados anatômicas das espermatecas, mas a histologia ainda é desconhecida. O objetivo deste trabalho foi descrever a anatomia, histologia e histoquímica da espermateca de Doru luteipes. A espermateca de D. luteipes é uma estrutura única formada por um bulbo dilatado associado a um ducto sinuoso. As células do bulbo e àquelas do ducto são diferentes ao longo do órgão. As células do bulbo e do ducto são ricas em polissacarídeos neutros, glicoconjugados e proteínas indicando que as secreções produzidas participam da manutenção da viabilidade dos espermatozoides. Fibras musculares ocorrem tanto no bulbo quanto no ducto, característica incomum em espermatecas de outros insetos. Esta é a primeira descrição histológica da espermateca de D. luteipes, mostrando que as células do bulbo e ducto contribuem com secreções para manutenção dos espermatozoides sendo que as células do ducto tem maior participação neste processo e as fibras musculares estão distribuídas de forma diferente daquelas encontradas em espermatecas de outros insetos.
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