Cimolestids (Mammalia) from the early Paleocene (Puercan) of New Mexico

Thomas E. Williamson, Anne Weil, Barbara Standhardt

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Cimolestids are a minor component of early Paleocene (Puercan) faunas of western North America. Here we report on cimolestids from the early Paleocene (middle and late Puercan; Pu2-3) of the Nacimiento Formation, San Juan Basin, New Mexico. New specimens of Puercolestes simpsoni include portions of the deciduous and lower dentition not previously known. We conclude that Genus B of Van Valen is probably conspecific with this taxon. Two new genera and species, Chacopterygus minutus and Betonnia tsosia, are from the Pu2 and Pu2-Pu3, respectively. One additional unnamed taxon is based on isolated teeth from Pu2-3 localities. A phylogenetic analysis indicates that Puercolestes simpsoni is sister to Cimolestes. Chacopterygus minutus, Betonnia tsosia, and the unnamed cimolestid form a polytomy that is sister to Procerberus. This resulting clade is sister to Batodon + Maelestes. The results of this analysis suggest that P. simpsoni is descended from Cretaceous taxa of western North America. The origins of other early Paleocene cimolestids from either Asia or North America is equivocal. The species diversity of Cimolestidae in the Puercan of New Mexico and other Puercan localities of western North America is similar to that of latest Cretaceous (Lancian) faunas of the northern Rocky Mountain Region.

Original languageEnglish
Pages (from-to)162-180
Number of pages19
JournalJournal of Vertebrate Paleontology
Volume31
Issue number1
DOIs
StatePublished - 1 Jan 2011

Fingerprint

Paleocene
fauna
Cretaceous
dentition
mountain region
tooth
new genus
species diversity
new species
phylogenetics
North America
basin
analysis

Cite this

Williamson, Thomas E. ; Weil, Anne ; Standhardt, Barbara. / Cimolestids (Mammalia) from the early Paleocene (Puercan) of New Mexico. In: Journal of Vertebrate Paleontology. 2011 ; Vol. 31, No. 1. pp. 162-180.
@article{f30cc13c1e604ac9b6bb491787085048,
title = "Cimolestids (Mammalia) from the early Paleocene (Puercan) of New Mexico",
abstract = "Cimolestids are a minor component of early Paleocene (Puercan) faunas of western North America. Here we report on cimolestids from the early Paleocene (middle and late Puercan; Pu2-3) of the Nacimiento Formation, San Juan Basin, New Mexico. New specimens of Puercolestes simpsoni include portions of the deciduous and lower dentition not previously known. We conclude that Genus B of Van Valen is probably conspecific with this taxon. Two new genera and species, Chacopterygus minutus and Betonnia tsosia, are from the Pu2 and Pu2-Pu3, respectively. One additional unnamed taxon is based on isolated teeth from Pu2-3 localities. A phylogenetic analysis indicates that Puercolestes simpsoni is sister to Cimolestes. Chacopterygus minutus, Betonnia tsosia, and the unnamed cimolestid form a polytomy that is sister to Procerberus. This resulting clade is sister to Batodon + Maelestes. The results of this analysis suggest that P. simpsoni is descended from Cretaceous taxa of western North America. The origins of other early Paleocene cimolestids from either Asia or North America is equivocal. The species diversity of Cimolestidae in the Puercan of New Mexico and other Puercan localities of western North America is similar to that of latest Cretaceous (Lancian) faunas of the northern Rocky Mountain Region.",
author = "Williamson, {Thomas E.} and Anne Weil and Barbara Standhardt",
year = "2011",
month = "1",
day = "1",
doi = "10.1080/02724634.2011.539649",
language = "English",
volume = "31",
pages = "162--180",
journal = "Journal of Vertebrate Paleontology",
issn = "0272-4634",
publisher = "Taylor and Francis Ltd.",
number = "1",

}

Cimolestids (Mammalia) from the early Paleocene (Puercan) of New Mexico. / Williamson, Thomas E.; Weil, Anne; Standhardt, Barbara.

In: Journal of Vertebrate Paleontology, Vol. 31, No. 1, 01.01.2011, p. 162-180.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Cimolestids (Mammalia) from the early Paleocene (Puercan) of New Mexico

AU - Williamson, Thomas E.

AU - Weil, Anne

AU - Standhardt, Barbara

PY - 2011/1/1

Y1 - 2011/1/1

N2 - Cimolestids are a minor component of early Paleocene (Puercan) faunas of western North America. Here we report on cimolestids from the early Paleocene (middle and late Puercan; Pu2-3) of the Nacimiento Formation, San Juan Basin, New Mexico. New specimens of Puercolestes simpsoni include portions of the deciduous and lower dentition not previously known. We conclude that Genus B of Van Valen is probably conspecific with this taxon. Two new genera and species, Chacopterygus minutus and Betonnia tsosia, are from the Pu2 and Pu2-Pu3, respectively. One additional unnamed taxon is based on isolated teeth from Pu2-3 localities. A phylogenetic analysis indicates that Puercolestes simpsoni is sister to Cimolestes. Chacopterygus minutus, Betonnia tsosia, and the unnamed cimolestid form a polytomy that is sister to Procerberus. This resulting clade is sister to Batodon + Maelestes. The results of this analysis suggest that P. simpsoni is descended from Cretaceous taxa of western North America. The origins of other early Paleocene cimolestids from either Asia or North America is equivocal. The species diversity of Cimolestidae in the Puercan of New Mexico and other Puercan localities of western North America is similar to that of latest Cretaceous (Lancian) faunas of the northern Rocky Mountain Region.

AB - Cimolestids are a minor component of early Paleocene (Puercan) faunas of western North America. Here we report on cimolestids from the early Paleocene (middle and late Puercan; Pu2-3) of the Nacimiento Formation, San Juan Basin, New Mexico. New specimens of Puercolestes simpsoni include portions of the deciduous and lower dentition not previously known. We conclude that Genus B of Van Valen is probably conspecific with this taxon. Two new genera and species, Chacopterygus minutus and Betonnia tsosia, are from the Pu2 and Pu2-Pu3, respectively. One additional unnamed taxon is based on isolated teeth from Pu2-3 localities. A phylogenetic analysis indicates that Puercolestes simpsoni is sister to Cimolestes. Chacopterygus minutus, Betonnia tsosia, and the unnamed cimolestid form a polytomy that is sister to Procerberus. This resulting clade is sister to Batodon + Maelestes. The results of this analysis suggest that P. simpsoni is descended from Cretaceous taxa of western North America. The origins of other early Paleocene cimolestids from either Asia or North America is equivocal. The species diversity of Cimolestidae in the Puercan of New Mexico and other Puercan localities of western North America is similar to that of latest Cretaceous (Lancian) faunas of the northern Rocky Mountain Region.

UR - http://www.scopus.com/inward/record.url?scp=79951571326&partnerID=8YFLogxK

U2 - 10.1080/02724634.2011.539649

DO - 10.1080/02724634.2011.539649

M3 - Article

AN - SCOPUS:79951571326

VL - 31

SP - 162

EP - 180

JO - Journal of Vertebrate Paleontology

JF - Journal of Vertebrate Paleontology

SN - 0272-4634

IS - 1

ER -