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Species diversity, tooth size, and shape of Haplomylus (Condylarthra, Hyopsodontidae) from the Powder River basin, northeastern Wyoming

Peter Robinson and Blythe Anne Williams
Species diversity, tooth size, and shape of Haplomylus (Condylarthra, Hyopsodontidae) from the Powder River basin, northeastern Wyoming
Contributions to Geology (May 1997) 31 (2): 59-78

Abstract

Haplomylus specimens from Lower Eocene rocks of the Powder River Basin can be assigned to four species based on morphology. One of these is the generotypic species, H. speirianus, and a second is a similar-sized, but morphologically distinct new species, H. bozemanesnsis. These two species occur together, in apparent stasis, for over 120 meters of section. Two other species replace them after an interval represented by approximately 20 meters of deposits. These latter species are larger, but each resembles one of the earlier forms. The co-occurrence of two closely related species with total overlap in metric characteristics shows the need for caution in using an exclusively measurement-based stratophenetic approach to lineage evaluation through time.


ISSN: 0010-7980
Coden: WUGGAO
Serial Title: Contributions to Geology
Serial Volume: 31
Serial Issue: 2
Title: Species diversity, tooth size, and shape of Haplomylus (Condylarthra, Hyopsodontidae) from the Powder River basin, northeastern Wyoming
Affiliation: University of Colorado Museum, Boulder, CO, United States
Pages: 59-78
Published: 199705
Text Language: English
Publisher: University of Wyoming, Laramie, WY, United States
References: 19
Accession Number: 1998-013122
Categories: Vertebrate paleontology
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 8 tables, sketch map
N43°00'00" - N44°00'00", W106°00'00" - W106°00'00"
Secondary Affiliation: Duke University Medical Center, USA, United States
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 199806
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