About one-third of the animal's skeleton—including most of the skull—has been found as disassociated bones of several individuals. The jaw bends up at the tip, possibly supporting a fleshy appendage similar to the sensitive tentacles of the star-nosed mole. Necrolestes is also sometimes reconstructed as a mole-like creature. It probably fed on insects or worms.
Its classification is not firmly resolved due to it being highly apomorphic and having an anatomy unlike any other known mammal, living or extinct. It possibly belongs to the marsupial lineage (Metatheria). On the other hand, the possibility that it is an eutherian cannot be ruled out based on the currently available data, given as how, even as an island, South America had extensive lineages of both marsupial and placental mammals. A second species, N. mirabilis has now been described.
- Palmer, D., ed. (1999). The Marshall Illustrated Encyclopedia of Dinosaurs and Prehistoric Animals. London: Marshall Editions. p. 204. ISBN 1-84028-152-9.
- Francisco Goin, Alejandra Abello, Eduardo Bellosi, Richard Kay, Richard Madden y Alfredo Carlini. Los Metatheria sudamericanos de comienzos del Neógeno (Mioceno Temprano, Edad-mamífero Colhuehuapense). Parte I: Introducción, Didelphimorphia y Sparassodonta. Ameghiniana v.44 n.1 Buenos Aires ene./mar. 2007 Full article in Spanish
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