Emergence of Two Nominal Species, Ostrinia scapulalis and O. orientalis, from a Single Brood (Lepidoptera : Crambidae)

概要

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Two closely related pyraustine species, Ostrinia scapulalis and O. orientalis, are distinguished from each other by a difference in the male mid-tibia, although they are not distinguishable in other male features and in females. The present study showed that two forms of males that are morphologically identified as these two species emerged from a single brood together with females. No male with an intermediate condition of mid-tibia was contained in this brood. The emergence of two male forms corresponding to the two species was previously reported from another locality in Japan, and the present report is the second case. These findings suggest that the two species occasionally hybridize under natural conditions. Another possibility is that the two nominal species are actually conspecific, and thus the observed male dimorphism within broods represents a mere intraspecific variation. More studies including cross experiments and detailed information on their biology are needed to clarify the status of these two nominal species. O. scapulalis and O. orientalis are good material for studying the genetics and evolution of the male mid-tibial morphology in Ostrinia.
日本昆虫学会の論文
2000-12-25