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Notes on the time when the new female adults of the ambrosia beetle crossotarsus niponicus coleoptera platypodidae harvest their symbiotic fungi into their mycetangia


, : Notes on the time when the new female adults of the ambrosia beetle crossotarsus niponicus coleoptera platypodidae harvest their symbiotic fungi into their mycetangia. Insecta Matsumurana (17): 1-19

The time when the new female adults of C. niponicus Blandford harvest their symbiotic fungi into their fungus repositories or mycetangia was examined. The glands associated with the mycetangia are recognized from a very early period when the body color of the new female adults is still light yellow. From the stage when the body color is reddish brown, the sphere-shaped tissues, 0.2 mm in diameter and situated at the back of the preoral cavity, are distinctly identified. When the females are still found in the gallery but are already dark brown, no fungus spores can be discerned in the mycetangium. In the flight season many spores are recognized in the mycetangium. The female adults probably harvest the symbiotic fungus spores in their mycetangia just before their appearance.

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