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Systematics of the genus Palaeictops Matthew, 1899 (Mammalia, Leptictidae), with the description of two new species from the Middle Eocene of Utah and Wyoming. (American Museum novitates, no. 3867)

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dc.contributor.author Velazco, Paúl M.
dc.contributor.author Novacek, Michael J.
dc.date.accessioned 2016-11-21T15:35:12Z
dc.date.available 2016-11-21T15:35:12Z
dc.date.issued 2016-11-18
dc.identifier.uri http://hdl.handle.net/2246/6691
dc.description 41 pages, 1 unnumbered page : illustrations (some color) ; 26 cm. en_US
dc.description.abstract Palaeictops is a genus of early Cenozoic Leptictidae, currently comprising six species known from Eocene faunas in the United States and Canada. Two new species, Palaeictops altimontis and P. robustus, are represented by nearly complete skulls and mandibles from the Tepee Trail (Middle Eocene) and Uinta (Middle Eocene) formations of Wyoming and Utah, respectively. They are similar to other species of Palaeictops in having a single sagittal crest, small suprameatal foramen, and an expanded cochlear fossula. Phylogenetic analysis recovered a monophyletic Palaeictops and a sister relationship of P. bicuspis and P. multicuspis with P. matthewi sister to this clade. The subfamily Leptictinae is herein recognized to comprise Blacktops, Leptictis, Megaleptictis, and Palaeictops. This group is distinctive in having a number of features that indicate a less sectorial cheektooth dentition than in the nonleptictine Prodiacodon and Myrmecoboides. The leptictines Palaeictops and Leptictis are also known from postcranial elements, and these show features, such as the distally fused tibia and fibula, that distinguish them from the condition in Prodiacodon. The late Cretaceous genus Gypsonictops is used as an outgroup for the phylogenetic assessment of leptictids herein, but it remains uncertain whether this taxon has a close relationship with other leptictids or lies outside the crown group Placentalia. en_US
dc.language.iso en_US en_US
dc.publisher American Museum of Natural History. en_US
dc.relation.ispartofseries American Museum novitates;no.3867.
dc.subject Palaeictops altimontis. en_US
dc.subject Palaeictops robustus. en_US
dc.subject Leptictidae. en_US
dc.subject Phylogeny. en_US
dc.subject Fremont County (Wyo.) en_US
dc.subject Ouray Region (Utah) en_US
dc.subject Wyoming. en_US
dc.subject Utah. en_US
dc.title Systematics of the genus Palaeictops Matthew, 1899 (Mammalia, Leptictidae), with the description of two new species from the Middle Eocene of Utah and Wyoming. (American Museum novitates, no. 3867) en_US
dc.title.alternative Systematics of Palaeictops. 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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