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Comparison of ultrastructure among sibling species of Ostrinia (Lepidoptera: Crambidae) from China

Published online by Cambridge University Press:  03 January 2012

Zhaofu Yang  and
Yalin Zhang
Zhaofu Yang
Affiliation:
Key laboratory of Plant Protection Resources and Pest Management, Ministry of Education; Entomological Museum, Northwest A&F University, Yangling, Shaanxi 712100, China
Yalin Zhang*
Affiliation:
Key laboratory of Plant Protection Resources and Pest Management, Ministry of Education; Entomological Museum, Northwest A&F University, Yangling, Shaanxi 712100, China
*
1Corresponding author (e-mail: [email protected]).
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Abstract

Scanning electron microscopy on the ultrastructure of scales on the forewings and labial palpi suggests species-diagnostic differences among six sibling species of the genus Ostrinia Hübner. Among four species with small mid-tibiae, O. furnacalis (Guenée) and O. nubilalis (Hübner) show similar ultrastructure of the distal forewing scales, which is distinctly different from that of O. orientalis Mutuura and Munroe and O. dorsivittata (Moore). The diameter of windows between longitudinal ridges and cross ribs of forewing scales in O. dorsivittata is the largest among examined species, and clearly different from that in the other three small mid-tibiae species. Scales of the labial palpi of O. orientalis have indistinct vestigial windows; windows of O. nubilalis are more numerous and larger than in the other three small mid-tibiae species. Among two species with massive mid-tibiae, window diameter of forewing scales is larger in O. zealis (Guenée) than in O. scapulalis (Walker). Moreover, the number and diameter of windows in scales of the labial palpi differs between these two species. In addition to other known morphological differences, these ultrastructural differences provide further evidence that closely related Ostrinia species are distinct.

Résumé

La microscopie électronique à balayage de l’ultrastructure des écailles sur les ailes antérieures et les palpes labiaux indique la présence de différences diagnostiques de niveau spécifique entre six espèces-soeurs d’Ostrinia Hübner. Parmi les quatre espèces à petits tibias médians, O. furnacalis (Guenée) et O. nubilalis (Hübner) possèdent la même ultrastructure des écailles distales de l’aile antérieure qui est nettement différente de celles d’O. orientalis Mutuura et Munroe et d’O. dorsivittata (Moore). Le diamètre des fenêtres entre les crêtes longitudinales et transversales des écailles de l’aile antérieure d’O. dorsivittata est le plus important parmi les espèces examinées et nettement différent de ceux des trois autres espèces à petits tibias médians. Les écailles du palpe labial d’O. orientalis possèdent des fenêtres vestigiales indistinctes; les fenêtres d’O. nubilalis sont plus nombreuses et plus grandes que celles des trois autres espèces à petits tibias médians. Chez les deux espèces à forts tibias médians, le diamètre des fenêtres des écailles de l’aile antérieure est plus grand chez O. zealis (Guenée) que chez O. scapularis (Walker). De plus, le nombre et le diamètre des fenêtres du palpe labial diffèrent chez ces deux espèces. En plus des autres différences morphologiques connues, ces différences ultrastructurales sont des preuves additionnelles que ces espèces fortement apparentées d’Ostrinia sont distinctes.

[Traduit par la Rédaction]

Type
Articles
Information
The Canadian Entomologist , Volume 143 , Issue 2 , April 2011 , pp. 126 - 135
Copyright
Copyright © Entomological Society of Canada 2011

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