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- W1439168938 abstract "Foot posture in Mammalia represents a morphological and functional continuum from plantigrade to unguligrade. Oxyaenidae and Hyaenodontidae, diverse mammalian carnivores present during the early Cenozoic, exhibit a range of calcaneal morphologies indicating variation in foot posture. More recent hyaenodontids have been hypothesized to possess relatively cursorial behaviors compared to older species of both oxyaenids and hyaenodontids. Using a metric correlated with foot posture in Carnivora, the calcaneal gear ratio (CGR), I tested the hypothesis that a trend towards digitigrady (increasing CGR) existed in Oxyaenidae and Hyaenodontidae by applying two different models of trait evolution, directional selection and pure Brownian motion. First, I used phylogenetic generalized least squares analysis of variance to test for a correlation between CGR and foot posture in a comparative sample of extant Carnivora. I then applied directional selection and Brownian motion models to the continuous trait data for the extinct creodonts. Though there is phylogenetic signal in the data (Pagel's λ = 0.888, p-value = 0.0488), differences were significant among foot posture categories (p-value < 0.01). The directional selection model indicated a slight positive change towards digitigrady; however, Brownian motion (AICw = 0.637) provided a better fit for the data than directional selection (AICw = 0.363). Quantitative tests of the patterns observed in foot posture allow for the inference of evolutionary processes acting on Oxyaenidae and Hyaenodontidae. The lack of strong support for directional selection indicated overwhelming specialization towards digitigrady and cursoriality did not drive morphological evolution in creodonts." @default.
- W1439168938 created "2016-06-24" @default.
- W1439168938 creator A5074477290 @default.
- W1439168938 date "2015-04-01" @default.
- W1439168938 modified "2023-09-23" @default.
- W1439168938 title "Evolutionary Trends in Foot Posture in the Extinct Carnivores Oxyaenidae and Hyaenodontidae (Mammalia: Creodonta)" @default.
- W1439168938 doi "https://doi.org/10.1096/fasebj.29.1_supplement.867.16" @default.
- W1439168938 hasPublicationYear "2015" @default.
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