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New basal Interatheriidae (Typotheria, Notoungulata, Mammalia) from the Paleogene of central Chile ; American Museum novitates, no. 3520

Show simple item record Hitz, Ralph B., 1964- en_US Flynn, John J. (John Joseph), 1955- en_US Wyss, Andre R. en_US 2006-08-16T21:10:08Z 2006-08-16T21:10:08Z 2006 en_US
dc.description 32 p. : ill., map ; 26 cm. en_US
dc.description Includes bibliographical references (p. 28-31). en_US
dc.description.abstract Two new basal interatheriids ("notopithecines") are described from central Chile. Specimens of a new taxon, Johnbell hatcheri, derive from Abanico Formation deposits near Termas del Flaco, in the valley of the Rio Tinguiririca, forming a distinctive element of the Tinguiririca Fauna. The Tinguiririca Fauna, which forms the basis of the recently defined Tinguirirican SALMA, documents the co-occurrence of species of archaic, dentally primitive herbivores and basal members of later diverging groups of more advanced hypsodont forms, and other transitional aspects of mammal evolution near the Eocene/Oligocene boundary. A specimen recovered from the Abanico Formation in the drainage of the Rio Cachapoal (~100 km north of Termas del Flaco), SGOPV 3451 is referred to Johnbell hatcheri. This is the first time a specimen from elsewhere in the central Chilean Main Range has been assigned to a species represented in the stratotype sequence of the Tinguiririca Fauna (upper Rio Tinguiririca Valley). Ignigena minisculus, the other new basal interatheriid recognized herein, is known only from older strata of the Abanico Formation, from the Tapado Fauna within the Rio Tinguiririca Valley, estimated to be Casamayoran in age. Phylogenetic analysis shows these two new basal interatheriids to be outgroups to the Interatheriinae. Both new taxa are smaller than all other interatheriids known, except Punapithecus. Small body size may reflect geographic provincialism, as these diminutive forms are rest[r]icted to more northern latitudes compared to larger basal interatheriids, which derive from Patagonia. SGOPV 3604, from the Abanico Formation along the Rio Azufre, several kilometers north of the Rio Tinguiririca drainage, is referred to the early interatheriid Antepithecus brachystephanus, a taxon otherwise known only from Casamayoran ("late" Barrancan subage) SALMA deposits in Patagonia. A phylogenetic definition for the name Interatheriidae is proposed on the strength of the resolution achieved in the phylogenetic analysis. This analysis also shows clearly that "Notopithecinae" represents a paraphyletic assemblage. We suggest that taxa formerly termed "notopithecines" are more appropriately referred to as "basal interatheriids". en_US
dc.format.extent 2267773 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. 3520 en_US
dc.subject.lcc QL1 .A436 no.3520 2006 en_US
dc.subject.lcsh Johnbell hatcheri. en_US
dc.subject.lcsh Ignigena minisculus. en_US
dc.subject.lcsh Interatheriidae. en_US
dc.subject.lcsh Notoungulata -- Chile. en_US
dc.subject.lcsh Mammals, Fossil -- Chile. en_US
dc.subject.lcsh Paleontology -- Paleogene -- Chile. en_US
dc.subject.lcsh Paleontology -- Chile. en_US
dc.title New basal Interatheriidae (Typotheria, Notoungulata, Mammalia) from the Paleogene of central Chile ; American Museum novitates, no. 3520 en_US
dc.title.alternative New basal interatheriids, Chile 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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