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Diversity, distribution and floral specificity of tangle-veined flies (Diptera: Nemestrinidae) in north west Patagonia, Argentina

Diversity, distribution and floral specificity of tangle-veined flies (Diptera: Nemestrinidae) in north west Patagonia, Argentina

Revista Chilena de Historia Natural 79(1): 29-40

ISSN/ISBN: 0716-078X

DOI: 10.4067/s0716-078x2006000100003

Tangle-veined flies (Nemestrinidae) constitute a primitive and rather widespread family among Diptera. The genus Trichophthalma Occurs in Australia and South America and is the only one in the family with a typically Gondwanian, disjoint distribution. The ecology and distribution of most southern South American species of this genus remains Virtually unknown. We Studied the diversity, distribution and flower specificity of flower-visiting species of the genus Trichophthalma in the temperate forests of southern South America in tell sites along an cast-west rainfall gradient (37-40deg. S) oil the eastern slope of the Andes. We recorded nine species of Trichophthalma, which showed all overlapped distribution along the gradient and different degrees of floral specificity. Three species are reported for Argentina for the first lime and three are first recorded as flower visitors to the local flora. Our results show that while ill Southern Africa tangle-veined flies are engaged in highly specialized pollination interactions with long-tubed species, the Trichophthalma spp. of Patagonia share their flowers with a diverse and rather unspecialized visitor fauna among which several species of flies. bees and birds are present.

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Accession: 022450262

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