INSUGEO   12554
INSTITUTO SUPERIOR DE CORRELACION GEOLOGICA
Unidad Ejecutora - UE
artículos
Título:
Phylogenetic position and morphology of Abrothrix illutea Thomas, 1925, with comments on the incongruence between gene trees of Abrothrix (Rodentia, Cricetidae) and their implications for the delimitation of the genus
Autor/es:
TETA, P.; D'ELÍA, G.; PARDIÑAS, U.F.J.; JAYAT, P.; ORTIZ, P.
Revista:
Zoosystematics and Evolution
Editorial:
Wiley-VCH
Referencias:
Lugar: Berlin; Año: 2011 vol. 87 p. 227 - 241
ISSN:
1435-1935
Resumen:
Abrothrix illutea Thomas, 1925 is a poorly known sigmodontine rodent of the recently
diagnosed tribe Abrotrichini. Here we report new locality records in northwestern Argentina,
describe in detail several morphological traits of this mouse and provide an
emended diagnosis for the species. Abrothrix illutea is characterized by a unique combination
of characters, including uniform dark olive-grey dorsal coloration; skull robust,
with the interorbital constriction hourglass shaped and smoothly rounded; muzzle
elongate; nasals and premaxillae slightly projected anterior to the incisors; palate ending
at about the plane of the last upper molars; upper incisors broad and orthodont;
molars hypsodont, M1 with anteroloph and mesoloph well developed; stomach unilocular-
hemiglandular; terminal crater of the phallus ventrally directed; cartilaginous distal
baculum reduced, composed of two lateral digits. These morphological features are discussed
at the light of phylogenetic analyses of nuclear and mitochondrial DNA sequences.
Results of these analyses, the first to include A. illutea, are incongruent between
loci. It is suggested that the nuclear based tree better reflects the pattern of
morphological variation, and presumably the species tree, than the mitochondrial tree.
These aspects are discussed in reference to the contents and limits of the genus Abrothrix.Thomas, 1925 is a poorly known sigmodontine rodent of the recently
diagnosed tribe Abrotrichini. Here we report new locality records in northwestern Argentina,
describe in detail several morphological traits of this mouse and provide an
emended diagnosis for the species. Abrothrix illutea is characterized by a unique combination
of characters, including uniform dark olive-grey dorsal coloration; skull robust,
with the interorbital constriction hourglass shaped and smoothly rounded; muzzle
elongate; nasals and premaxillae slightly projected anterior to the incisors; palate ending
at about the plane of the last upper molars; upper incisors broad and orthodont;
molars hypsodont, M1 with anteroloph and mesoloph well developed; stomach unilocular-
hemiglandular; terminal crater of the phallus ventrally directed; cartilaginous distal
baculum reduced, composed of two lateral digits. These morphological features are discussed
at the light of phylogenetic analyses of nuclear and mitochondrial DNA sequences.
Results of these analyses, the first to include A. illutea, are incongruent between
loci. It is suggested that the nuclear based tree better reflects the pattern of
morphological variation, and presumably the species tree, than the mitochondrial tree.
These aspects are discussed in reference to the contents and limits of the genus Abrothrix.Abrothrix illutea is characterized by a unique combination
of characters, including uniform dark olive-grey dorsal coloration; skull robust,
with the interorbital constriction hourglass shaped and smoothly rounded; muzzle
elongate; nasals and premaxillae slightly projected anterior to the incisors; palate ending
at about the plane of the last upper molars; upper incisors broad and orthodont;
molars hypsodont, M1 with anteroloph and mesoloph well developed; stomach unilocular-
hemiglandular; terminal crater of the phallus ventrally directed; cartilaginous distal
baculum reduced, composed of two lateral digits. These morphological features are discussed
at the light of phylogenetic analyses of nuclear and mitochondrial DNA sequences.
Results of these analyses, the first to include A. illutea, are incongruent between
loci. It is suggested that the nuclear based tree better reflects the pattern of
morphological variation, and presumably the species tree, than the mitochondrial tree.
These aspects are discussed in reference to the contents and limits of the genus Abrothrix.A. illutea, are incongruent between
loci. It is suggested that the nuclear based tree better reflects the pattern of
morphological variation, and presumably the species tree, than the mitochondrial tree.
These aspects are discussed in reference to the contents and limits of the genus Abrothrix.Abrothrix.