. Bulletin. Natural history; Natural history. September 1985 125 Years of Biological Research 187 ing CuCucs B and D, C. okeechobeensis containing Cues E and I, and C. texana containing Cue E glycoside showed an almost identical qualitative response for Diabrotica balteata, D. cristata, D. barberi, D. u. howardi. D. v. virgifera, and Acalymma vittatum (Metcalf et al. 1980). There is substantial evidence of the lengthy coevolutionary association of Cucui'bitaceae plants and Luperini beetles. The genus Cucurblta is indig- enous to the Americas, where it has existed since pre-Columbian times. It
. Bulletin. Natural history; Natural history. September 1985 125 Years of Biological Research 187 ing CuCucs B and D, C. okeechobeensis containing Cues E and I, and C. texana containing Cue E glycoside showed an almost identical qualitative response for Diabrotica balteata, D. cristata, D. barberi, D. u. howardi. D. v. virgifera, and Acalymma vittatum (Metcalf et al. 1980). There is substantial evidence of the lengthy coevolutionary association of Cucui'bitaceae plants and Luperini beetles. The genus Cucurblta is indig- enous to the Americas, where it has existed since pre-Columbian times. It is considered to have its center of origin in the tropical or semitropical region of southern Mexico, from which the 27 species (22 wild, 5 cultivated) have radiated to North and South America (Whitaker & Bemis 1964, 1975). The present distribution of species of Cucur- blta is (Whitaker & Bemis 1964): Southern Mexico and Central America, 14 species; Northern Mexico, 6 species; Northern South America, 4 species; Southern North America, 8 species. The Diabrotica beetles have re- markably similar geographic distribu- tion, as shown in Fig. 5. The putative area of origin of this genus is in nor- thern South America or Central America, from which a few species have radiated into both southern South America and North America (data from Wilcox 1972). Fig. 5 also shows the species distri- bution of the Aulacophora (Maulik 1936), the Old-World counterparts of the Diabrotica, which also must have coevolved with Cucurbitaceae. This genus appears to have evolved in Indo- nesia and to have radiated into south- east Asia, extending north to China and Siberia and south to Australia. The very close systematic relationships of the Aulacophorina and Diabroticina, the intimate association of both sub- tribes with Cucurbitaceae, and their common response to cucurbitacins strongly suggest a common ancestral co-evolution with an early cucurbi- taceous species during a geologic per- ?*«51i^
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