|dc.description.abstract||The genus Argentinomyia Lynch Arribálzaga, 1891 (Syrphidae: Syrphinae: Bacchini), was taxonomically
revised and a phylogenic analysis was conducted. The monophyly and internal phylogenetic composition
of Argentinomyia and related taxa were reconstructed, based on adults morphologic characters. The ingroup
includes 26 available species of Argentinomyia. Fourteen species of Melanostoma, Platycheirus,
Tuberculanostoma, Talahua and Xanthandrus (all Bacchini) were used as out-groups. Trichopsomyia
antillensis Thompson (Pipizini) was selected to root the phylogeny. The analysis of 70 phylogenetically
informative characters produced one most parsimonious cladograms (L=120 steps, CI=65, RI=90) within
the in-group topology (A. altissima, (A. rex, (A. browni, (A. bolivariensis))), (A. octomaculata, (A.
tropica, A. luculenta)), (A. opaca, A. rugosonasa, ((A. crenulata, A. testaceipes))), (A. nigrans, (A.
lineata, (A. neotropica, A. pollinosa))), ((A. currani, A. maculata), (A. praeusta, A. jamaicensis))), (A.
catabomba, A. lanei)), (A. scitula, A. columbiana, A. fastigata, A. thiemei, (A. longicornis, A.
peruviana)))). Argentinomyia is placed in the tribe Bacchini, subtribe Melanostomatina. According to the
strict consensus and preferred character state optimizations, Argentinomyia is a monophyletic group with
Melanostoma as the sister genus. There are several synapomorphies for Argentinomyia, although all show
reversals in at least a few species: 1) a bare area under the antenna; 2) elongated antenna, with scape
much longer than wider, basoflagellomere usually elongated; 3) female front with a pollinose pattern; 4)
face with transverse grooves, sometimes broadly punctuate and with iridescent reflections; 5) male
genitalia with surstyles generally widened and apically irregular. At least seven well-recognizable species
groups are characterized: browni, tropica, crenulata, neotropica, maculata, lanei and longicornis. A new
key to all species is provided. New diagnosis, detailed distributional data, notes on the biology of some
species, and illustrations of critical characters (photographs and drawings) are included to assist the