INVESTIGADORES
UDRIZAR SAUTHIER daniel Edgardo
artículos
Título:
A new species of the tetraploid vizcacha rat Tympanoctomys (Caviomorpha, Octodontidae) from Central Patagonia, Argentina
Autor/es:
TETA, P.; PARDIÑAS, U.F.J.; UDRIZAR SAUTHIER, D. E.; GALLARDO, M.H.
Revista:
JOURNAL OF MAMMALOGY
Editorial:
ALLIANCE COMMUNICATIONS GROUP DIVISION ALLEN PRESS
Referencias:
Lugar: Lawrence; Año: 2014 vol. 95 p. 60 - 71
ISSN:
0022-2372
Resumen:
A new living species of the desert-adapted tetraploid rodent Tympanoctomys (Caviomorpha, Octodontidae) is described. The new form is restricted to the type locality in Chubut Province, Central Patagonia, Argentina, although is known from at least 4 additional Holocene aged localities along the middle and lower valley of the Chubut River. Tympanoctomys sp. nov. is smaller than the living T. barrerae, its general coloration is yellowish (reddish in T. barrerae) and its tail is equal to ~43-50% of head and body length (~49-53% in T. barrerae). Its skull and dentition are characterized by an unique combination of morphological traits, including narrow and posteriorly acuminate nasals (broad and barrel-shaped in T. barrerae), supraoccipital not laterally expanded (expanded in T. barrerae) and eight-shaped lower 3rd molar (comma-shaped in T. barrerae and T. cordubensis). Morphometric and genetic evidences support the specific distinction of this Patagonian endemic Tympanoctomys, also characterized by smaller sperm than T. barrerae. Its reduced range, coupled with its recent extinction 26 at the Chubut River valley and the potential impact of large uranium mining projects in Central Patagonia suggest that this species faces a severe extinction risk in the short term