Browsing by Author "Amorim, Dalton de Souza"
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Item First known extant species of Alavesia (Diptera: Atelestidae) in the Neotropical region : Alavesia leukoprosopa, sp. nov., from the southern Atlantic Forest, Brazil (American Museum novitates, no. 3962)(American Museum of Natural History., 2020-10-06) Amorim, Dalton de Souza; Riccardi, Paula Raile; Rafael, José AlbertinoA first known extant Neotropical species of the atelestid genus Alavesia--Alavesia leukoprosopa, sp. nov.--is described from southeastern Brazil. The holotype (and only specimen so far) was collected with a Malaise trap in an area with strongly impacted semideciduous seasonal forest (dry forest) and open, entirely secondary vegetation. It was collected in mid spring, but has not been collected again so far. Alavesia leukoprosopa shares some derived features with the only two other extant species of the genus, known from the Brandberg Massif in Namibia, suggesting that all three extant species may compose together a small clade separate from the bulk of the Cretaceous diversity of Alavesia.Item Phylogeny, classification, Mesozoic fossils, and biogeography of the Leiinae (Diptera: Mycetophilidae). (Bulletin of the American Museum of Natural History, no. 446)(American Museum of Natural History., 2021-03-16) Oliveira, Sarah Siqueira; Amorim, Dalton de SouzaThe relationships among the genera of fungus gnats in the mycetophilid subfamily Leiinae are unclear, and the monophyly of this group is questionable. This monograph provides an extensive phylogenetic study of theLeiinae based on morphological data from a large taxonomic sample, including all genera that have ever been assigned to the subfamily and a wide outgroup sampling to properly test subfamilial monophyly. A data matrix with 128 morphological features of 117 terminal taxa was carried out under parsimony using different implicit weight schemes. All recovered topologies support a monophyletic Leiinae that is more restricted than the usual delimitation of the subfamily. We found no consistent evidence that a clade with Docosia Winnertz, Novakia Strobl, Ectrepesthoneura Enderlein, and Tetragoneura Winnertz group together with the remaining genera of Leiinae. A name with subfamily rank--Tetragoneurinae, already present in the literature--is used here to refer to this group. The allactoneurine genera Sticholeia Søli and Allactoneurade Meijere form a clade with the leiine genus Leiella and the genera of Manotinae, which is deeply nested within the Leiinae. The male terminalia patterns found within the subfamily are analyzed and illustrated. A classification for the Leiinae is proposed grouping 33 genera in seven clades ranked as tribes: Selkirkiini Enderlein, Megophthalmidiini, trib. nov., Rondaniellini, trib. nov., Cycloneurini Shaw and Shaw, Manotini Edwards, Anomalomyiini, trib. nov., and Leiini Edwards. A key for the world genera of Leiinae is also provided. The Cretaceous mycetophilid fossil record is revisited and the biogeographic evolution of the Leiinae is discussed.