INVESTIGADORES
SAN BLAS Diego German
congresos y reuniones científicas
Título:
A morphological phylogeny of Agrotis Ochsenheimer (Noctuidae), with emphasis on the South American species
Autor/es:
SAN BLAS, GERMÁN
Lugar:
Tucumán
Reunión:
Encuentro; V Encuentro de Lepidoptera Neotropicales; 2015
Institución organizadora:
Universidad Nacional de Tucumán
Resumen:
The monophyly of Agrotis Ochsenheimer in addition to the relationships among the South American species of the genus and the relationship between Agrotis and Feltia Walker are examined. A cladistic analysis was performed based on 45 terminals, with 28 ingroup (out of 230 worldwide Agrotis species) and 17outgroup taxa, and 126 characters (two continuous and 124 discrete) from adult morphology, including male and female genitalia. The ingroup included all South American species of Agrotis and two species of each other continent. The outgroup taxa comprised: two species from Austrandesiina group, two species from genera close to Agrotis, three species of Feltia from North America (including type species of the genus) and plus 10 species of Feltia tent. from South America. Parsimony analyses were performed under equal weighting and a sensitivity analysis applying implied weighting was performed trying ten k values (512, 256, 128, 64, 32, 16, 8, 4, 2 and 1), as a way of testing the groups obtained from equally weighted analysis. Finally, the strict consensus of all obtained trees was calculated. Thus, it can be assumed that those groups present in all trees obtained under different k values (homoplasy settings)either have better ?support? or the characters that support those groups are less homoplasious (more informative). Results support Agrotis as a monophyletic group, sister to the South American species of Feltia (Feltia tent.), and the latter being more closely related to Agrotis than to the "true" Feltia. Species of Agrotis that branched off first (including the type species) have characters shared with both Feltia and Agrotis. South American species of Agrotis (with some proviso) form a clade that branched off later, with some weakly supported species groups that had been proposed in previous works. Only two genera of the Agrotina group are represented in South America: Feltia and Agrotis. Optimization of species distribution on the tree shows Nearctic and Palearctic species of Agrotina in relatively "basal" position: Copablepharon Harvey, Euxoa Hübner, and Feltia. A similar pattern is shown by genus Agrotis, where "basal" positions are occupied by Holarctic species. The South American species included in the analysis, with some provisos, form two groups: Feltia tent. and South American Agrotis. Trees obtained after analyses using implied weights show similar relationships to those under equal weights, particularly regarding Feltia tent., showing Feltia tent. plus Agrotis forming a monophyletic group, sister to the "true" Feltia.