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Hawaiian Drosophila “Since I became aware, many years ago, of the astonishing development of Drosophila in Hawai’i, I have tried to interest geneticists and evolutionists in the fauna, but I fear that it has been considered, at least by some workers, that my descriptions of the size and diversity of the fauna are exaggerated. I do not exaggerate. There may be as many as 300 species concentrated in an area smaller than the little state of Massachusetts or less than one-fifth the size of Ireland. Where else has such a drosophilid fauna developed?” EC Zimmerman Hawaiian Drosophila - 1,000 endemics - single colonist - ancient: 25 mya - complex history - diverse behavior & morphology - ecological specialization 80% of picture wing species utilize a single type of host. The spoon tarsus subgroup A clade of 13 species placed in the modified tarsus species group. Eight taxa are sympatric on the Big Island. These are closely related, yet morphologically distinguishable. D. waddingtoni, is also found on Maui Nui. Founder effect speciation Large, polymorphic, outcrossed ancestral population One or a few colonists found a new population Selection is temporarily relaxed; drift acts to disrupt coadapted gene complexes Population “flushes” and rapidly increases in size; genetic variation carries through; selection is reestablished; species may occupy a new location in the adaptive landscape Wings Sc D. grimshawi Legs D. quasiexpansa D. waddingtoni D. proceriseta Head compound eye antennae mouthparts sclerites chaetotaxy D. adunca Mouthparts palps number and position of setae labellum specialized modifications in Hawaiian taxa D. adventitia labium labrum D. multiciliata