Journal
EUROPEAN JOURNAL OF ENTOMOLOGY
Volume 106, Issue 4, Pages 607-610Publisher
CZECH ACAD SCI, INST ENTOMOLOGY
DOI: 10.14411/eje.2009.076
Keywords
Coccinellidae; Harmonia axyridis; hatchability; infertile egg; morphology; scanning electron microscopy; sibling cannibalism; trophic egg
Categories
Funding
- Japan Society for the Promotion of Science [20405047]
- Ministry of Education, Culture, Sports, Science and Technology, Japan
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In Hymenoptera and Heteroptera, the absence of micropyles is one criterion for categorizing an egg as trophic. Undeveloped eggs are observed in more than 90% of the egg clusters of the ladybird beetle Harmonia axyridis Pallas. Traditionally, these undeveloped eggs are regarded as trophic eggs. The surfaces of the eggs of H. axyridis were examined using scanning electron microscopy and the presence of micropyles in the shells of developing and undeveloped eggs determined. Micropyles are circularly distributed around the top of eggs and present in both developing and undeveloped eggs. The number of micropyles in the shells of developing and undeveloped eggs did not differ significantly. Our results indicate that the undeveloped eggs of H. axyridis have micropyles, suggesting that the mechanisms regulating the production of undeveloped eggs in H. axyridis differ from those resulting in the production of trophic eggs by Hymenoptera and Heteroptera.
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