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Tuesday, April 13, 2010

ANCIENT SNAKES






Blair Hedges (Penn State University) and Nicolás Vidal (Muséum National d'Histoire Naturelle in Paris), have just discovered that species of snakes of reduced vision (blind), current inhabitants of the southeast african island of Madagascar, confused until recently with earth-worms (scolecophidians), existed since prehistoric times (160 million years), in Madagascar when this was even part of the continent Gondwana (Africa plus India). A molecular clock showed that scolecophidians inhabited Gondwana and that its initial diversification followed the division between East and West Gondwana (150 Ma). The ulterior evolution and dispersion of these blind snakes outside of Africa happened floating through the ocean and in earth following termites and ants and to populational isolation.


SERPIENTES PREHISTORICAS


Blair Hedges (Penn State University) y Nicolas Vidal (Muséum National d'Histoire Naturelle in Paris), acaban de descubrir que especies de serpientes de visión reducida (ciegas), habitantes actuales de la isla suroriental africana de Madagascar, confundidas hasta hace poco con gusanos de tierra (Scolecophidians), son serpientes prehistóricas existentes desde hace 160 millones de años (Ma), en Madagascar cuando esta aun formaba parte del continente Gondwana (Africa mas India). Un reloj molecular demostró que los scolecophidians habitaron Gondwana y que su diversificación inicial siguió a la división entre Gondwana Oriental y Occidental hace 150 Ma. La ulterior evolucion de estas serpientes ciegas fuera de Africa ocurrió flotando a traves del oceano y en tierra siguiendo a termitas y hormigas y al aislamiento poblacional.
Royal Society journal Biology Letters.

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