Morphometric variation in the cranium, mandible, and dentition of Canis latrans and Canis lepophagus (Carnivora: Canidae) and its implications for the identification of isolated fossil specimens

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Abstract

Morphometric variation in the cranium, mandible, and dentition of the Blancan coyote, Canis lepophagus, and the modern coyote, Canis latrans, was evaluated using discriminant function analysis to determine if continuous characters can be used to differentiate these 2 taxa. Measurements from 88 continuous characters were partitioned into 4 groups (cranial, upper dentition, mandibular, and lower dentition) and analyzed separately to evaluate whether isolated or fragmentary specimens support species-level discrimination. Measurements from the most complete, Irvingtonian-aged coyote skull were added to the analyses as an unknown to assess the morphometric affinity of this fossil specimen. Results indicate that complete morphometric separation is possible between C. lepophagus and C. latrans, but only using cranial or mandibular data. This separation is maintained for crania when the number of analyzed measurements is reduced to as little as 1 (height of the braincase). In contrast, a suite of mandibular measurements is needed to establish non-overlapping morphometric separation. The Irvingtonian-aged skull consistently groups with C. latrans, supporting the presence of the modern coyote in the Irvingtonian.

Original languageEnglish (US)
Pages (from-to)42-56
Number of pages15
JournalSouthwestern Naturalist
Volume50
Issue number1
DOIs
StatePublished - Mar 2005
Externally publishedYes

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cranium
mandible (bone)
Carnivora
Canis
Canis latrans
Canidae
dentition
teeth
fossils
fossil
skull
discriminant analysis

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics

Cite this

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title = "Morphometric variation in the cranium, mandible, and dentition of Canis latrans and Canis lepophagus (Carnivora: Canidae) and its implications for the identification of isolated fossil specimens",
abstract = "Morphometric variation in the cranium, mandible, and dentition of the Blancan coyote, Canis lepophagus, and the modern coyote, Canis latrans, was evaluated using discriminant function analysis to determine if continuous characters can be used to differentiate these 2 taxa. Measurements from 88 continuous characters were partitioned into 4 groups (cranial, upper dentition, mandibular, and lower dentition) and analyzed separately to evaluate whether isolated or fragmentary specimens support species-level discrimination. Measurements from the most complete, Irvingtonian-aged coyote skull were added to the analyses as an unknown to assess the morphometric affinity of this fossil specimen. Results indicate that complete morphometric separation is possible between C. lepophagus and C. latrans, but only using cranial or mandibular data. This separation is maintained for crania when the number of analyzed measurements is reduced to as little as 1 (height of the braincase). In contrast, a suite of mandibular measurements is needed to establish non-overlapping morphometric separation. The Irvingtonian-aged skull consistently groups with C. latrans, supporting the presence of the modern coyote in the Irvingtonian.",
author = "Gaberiel Bever",
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AB - Morphometric variation in the cranium, mandible, and dentition of the Blancan coyote, Canis lepophagus, and the modern coyote, Canis latrans, was evaluated using discriminant function analysis to determine if continuous characters can be used to differentiate these 2 taxa. Measurements from 88 continuous characters were partitioned into 4 groups (cranial, upper dentition, mandibular, and lower dentition) and analyzed separately to evaluate whether isolated or fragmentary specimens support species-level discrimination. Measurements from the most complete, Irvingtonian-aged coyote skull were added to the analyses as an unknown to assess the morphometric affinity of this fossil specimen. Results indicate that complete morphometric separation is possible between C. lepophagus and C. latrans, but only using cranial or mandibular data. This separation is maintained for crania when the number of analyzed measurements is reduced to as little as 1 (height of the braincase). In contrast, a suite of mandibular measurements is needed to establish non-overlapping morphometric separation. The Irvingtonian-aged skull consistently groups with C. latrans, supporting the presence of the modern coyote in the Irvingtonian.

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