Figure 10 - uploaded by Lutz Thilo Wasserthal
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Xanthopan morganii praedicta visiting flowers of Angraecum sesquipedale (A–D) and Angraecum compactum (E, F). A, male moth positioned on the labellum during a visit. B, visiting moth flying up as it withdraws its proboscis which has a pollinarium (p) attached to near the base of its proboscis. The pollinia lie flat against the proboscis because their stipes are parallel to it. C, female moth with laterally positioned pollinia on the tip of a labellum. D, a male moth flying in an enclosure immediately after its capture. The tongue bears a viscidium (v) near its base and a remnant (n) of what is probably nectar 7.9 cm from the base. E, maximal insertion of proboscis just before the start of withdrawal. F, pollinaria (p) are removed during withdrawal (A–F, Wasserthal, 1997). Pollinia of Angraecum sesquipedale are transferred. Those of Angraecum compactum are not (Wasserthal, 1997).
Source publication
Charles Darwin, Angraecum sesquipedale and Xanthopan morganii praedicta.
In this review we provide a detailed description of Darwin’s prediction of the coevolution of a long-spurred orchid, Angraecum sesquipedale, and a long-tongued moth, his correspondence on the subject, the history of the moth and the subsequent literature. On seeing the long sp...
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