Neither a rodent nor a platypus : a reexamination of Necrolestes patagonensis Ameghino ; American Museum novitates, no. 3546

Show simple item record Asher, Robert J. en_US Horovitz, Inés. en_US Martin, Thomas, Dr., Priv.-Doz. en_US Sánchez-Villagra, Marcelo R. en_US 2007-01-25T17:09:03Z 2007-01-25T17:09:03Z 2007 en_US
dc.description 40 p. : ill. ; 26 cm. en_US
dc.description Includes bibliographical references (p. 37-40). en_US
dc.description.abstract "We present new descriptions, figures, and interpretations of well-preserved cranioskeletal elements of the early Miocene, fossorial mammal Necrolestes patagonensis from Argentina. As previously noted, this animal is highly apomorphic and its phylogenetic affinities are difficult to interpret. Its derived features include hypsodont upper cheek teeth, a partially fused cervical spine, an unfused atlas consisting of separate right and left massae, and a distally ossified flexor tendon of the forearm. Characters that support its status as a therian mammal include a coiled cochlear housing of the inner ear. Consistent with its status as a metatherian is the presence of five upper incisors, transverse canal foramina, and a broad proximal fibula. However, we cannot confirm other characters claimed by previous researchers as evidence for affinity with marsupial or nonplacental mammals, such as the presence of an inflected mandibular angle and epipubic bones. Furthermore, Necrolestes shows similarities to eutherian mammals, such as small incisive foramina and possibly three molars. On biogeographic and some anatomical grounds, identification of Necrolestes as a metatherian remains a compelling option. However, pending a combined-data phylogenetic analysis encompassing Theria and accounting for the anatomical diversity of Necrolestes, possible membership in Eutheria should not be ruled out"--P. [1]. en_US
dc.format.extent 10109486 bytes
dc.format.mimetype application/pdf
dc.language eng en_US
dc.language.iso en_US
dc.publisher New York, NY : American Museum of Natural History en_US
dc.relation.ispartofseries American Museum novitates, no. 3546 en_US
dc.subject.lcc QL1 .A436 no.3546, 2007 en_US
dc.subject.lcsh Necrolestes patagonensis. en_US
dc.subject.lcsh Mammals, Fossil -- Argentina en_US
dc.subject.lcsh Paleontology -- Miocene -- Argentina. en_US
dc.subject.lcsh Paleontology -- Argentina. en_US
dc.subject.lcsh Mammals -- Phylogeny. en_US
dc.title Neither a rodent nor a platypus : a reexamination of Necrolestes patagonensis Ameghino ; American Museum novitates, no. 3546 en_US
dc.title.alternative Reexamination of Necrolestes patagonensis Ameghino en_US
dc.title.alternative Argentine fossorial mammal Necrolestes en_US
dc.type text en_US

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  • American Museum Novitates
    Novitates (Latin for "new acquaintances"), published continuously and numbered consecutively since 1921, are short papers that contain descriptions of new forms and reports in zoology, paleontology, and geology. New numbers are published at irregular intervals.

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