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Among the flourishing Muroidea, the Eucricetodontinae constitute the most diversifi ed subfamily of the Eurasian Palaeogene. Early representatives, such as Atavocricetodon and Eucricetodon, are notably characterized by their simple and primitive dental morphology. As a result, it appears very diffi cult to discriminate these genera according to their dental morphology, and that is emphasized by their imprecise diagnosis. Here, we aim at challenging the taxonomic validity of Atavocricetodon, frequently considered as a grade of Eucricetodon. We chose to investigate the outline of fi rst upper molars for four species of Atavocricetodon and seven of Eucricetodon, to avoid confusions made by their occlusal dental characters. The outline analysis involves samples of ten molars, and was realized by using Elliptic Fourier Transforms. Incisor enamel microstructures were investigated as well in four species, because this dental character appears highly useful in rodents to solve taxonomic issues. Results revealed that if a signifi cant difference exists between the RESUMEN Entre los florecientes Muroidea, los Eucricetodontinae constituyen la subfamilia más diversifi cada del Paleógeno euroasiático. Sus representantes tempranos, tales como Atavocricetodon y Eucricetodon, se caracterizan notablemente por su morfología dental simple y primitiva. Como resultado, parece muy difícil discriminar estos géneros en relación con su morfología dental, y eso queda enfatizado por su imprecisa diagnosis. Aquí, pretendemos desafi ar la validez taxonómica de Atavocricetodon, frecuentemente considerado como un grado de Eucricetodon. Para evitar las confusiones debidas a sus caracteres dentales oclusales, elegimos investigar el contorno de los primeros molares superiores de cuatro especies de Atavocricetodon y siete de Eucricetodon. El análisis del contorno implica muestras de diez molares, y fue realizado por medio de Transformaciones Elípticas de Fourier. Las microestructuras del esmalte de los incisivos fueron investigadas también en cuatro especies porque este carácter dental parece muy útil para la resolución de cuestiones GOMES RODRIGUES, MARIVAUX & VIANEY-LIAUD 18

spanish journal of paleontology/spanish journal of palaeontology

On the status of early Eucricetodontinae (Muroidea, Rodentia) with a special focus on the Atavocricetodon vs Eucricetodon issue: morphometrical and microstructural aspects