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Ultrastructure of the mesonotal mycangium of Xylosandrus mutilatus (Coleoptera: Curculionidae)

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Mycangial structures of female Xylosandrus mutilatus (Blandford, 1894), an Asian ambrosia beetle recently introduced and now established in the southeastern United States, were examined. In addition to the glandular (secretory) mesonotal mycangium located below the scutellum, nonglandular pit mycangia containing fungal propagules were discovered to occur externally on the scutellum. The ultrastructure of the glandular mesonotal mycangium, which consisted of an outer secretory layer covering an inner paired cuticular sac, is described and illustrated. Both secretory and cuticular layers of the mesonotal mycangium were highly tracheolated. Tracheae and tracheoles in association with a Xyleborine mycangium are reported here for the first time. Type 1 secretory cells were identified and observed passing electron-dense material into the glandular mycangium via efferent cuticular ductules, although type 2 secretory cells were not observed. Secretory cells were not observed in association with the nonglandular pit mycangia.

Nous avons examiné la structure des mycangiums chez les femelles de Xylosandrus mutilatus (Blandford, 1894), un scolyte asiatique récemment introduit et maintenant établi dans le sud-est des États-Unis. En plus du mycangium glandulaire (sécréteur) du mésonotum situé sous le scutellum, nous avons découvert des mycangiums non glandulaires en fosse placés extérieurement sur le scutellum et contenant des propagules de champignons. Nous décrivons et illustrons l’ultrastructure du mycangium glandulaire mésonotal qui consiste en une couche externe sécrétrice couvrant un sac cuticulaire interne double. Les couches tant sécrétrices que cuticulaires du mycangium mésonotal contiennent de nombreuses trachéoles. Nous signalons pour la première fois l’association des trachées et des trachéoles avec le mycangium chez un scolyte xyléboriné. Nous avons identifié des cellules sécrétrices de type 1 et observé du matériel dense aux électrons passant dans le mycangium glandulaire à travers des canalicules cuticulaires efférents, bien que des cellules de type 2 n’aient pas été trouvées. Nous n’avons découvert aucune cellule sécrétrice associée aux mycangiums en fosse non glandulaires.

Document Type: Research Article

Publication date: February 1, 2007

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  • Published since 1929, this monthly journal reports on primary research contributed by respected international scientists in the broad field of zoology, including behaviour, biochemistry and physiology, developmental biology, ecology, genetics, morphology and ultrastructure, parasitology and pathology, and systematics and evolution. It also invites experts to submit review articles on topics of current interest.
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