Tympanoctomys barrerae

The Tympanoctomys comprises only one species:

Tympanoctomys barrerae is a large Rat russet-red which one finds mainly in Argentine and with the Chile.

A tetraploid mammal?

It impassions the scientists since one found that it would have 102 Chromosomes, the number highest Diploïde of all the Mammifère S (the human have of it 46 , for example). In fact, the somatic cells of the russet-red Rat-viscache of Argentina have approximately twice more chromosomes than those of the narrowly related species. It is interesting to note that the head of its Spermatozoïde S is larger than the normal, probably to contain the increased volume of the material Génétique. The scientists think that this species of rat appeared in its tetraploid form when the number of chromosomes of an ancestor doubled, undoubtedly following an error to the Mitose or the Méiose in the reproductive bodies of the animal. One currently studies this species to determine if it carries really four complete sets of chromosomes (4 N ).

External bonds

Taxonomy:

Other external bonds:

Repertorio adaptativo (ecológico, morfológico, fisiológico there comportamental) of missed vizcacha colorada LED desierto, T.barrerae (Octodontidae): perfil of Modelo de Gondwana. See this document (illustrations).

Photographs:

Tympanoctomys_barrerae. Close-up.
Tympanoctomys_barrerae. Face.

Bibliography:

Gallardo M.H.; Bickham J.W. ; Honeycutt R.L. ; Ojeda R.A.; Köhler NR.; Discovery off tetraploidy in has mammal . 1999. Nature 401:341.

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