Long-bone geometry in columnar-limbed animals: Allometry of the proboscidean appendicular skeleton

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Abstract

Limb-bone allometry was investigated for 19 species of proboscideans, spanning almost the entire phylogenetic spectrum. More archaic proboscideans ('gompthotheres') have substantially thicker long-bone diaphyses relative to length than elephantids, as has been suggested previously, but contrary to previous suggestions it could not be confirmed that Mammuthus had more massive long-bone diaphyses on average than extant Elephas and Loxodonta. When correcting for phylogeny, the circumference of the limb bones to their length in proboscideans as a group generally scale with negative allometry, becoming stouter with increased length, as would be expected from limb mechanics. Few slopes were, however, statistically significantly negatively allometric. Correcting for phylogeny produced better correlations than traditional regression analyses, in contrast to most other studies where the reverse is the case. Intraspecific analyses of extant Elephas and Loxodonta, in addition to Mammuthus primigenius, Mammut americanum, and Gomphotherium productum, also resulted in negatively allometric regression slopes, frequently conforming to the theory of elastic similarity, as could be expected from the columnar posture of proboscideans. At present the reasons for the more massive limbs of gomphotheres s.l. are not fully understood. © 2007 The Linnean Society of London.

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APA

Christiansen, P. (2007). Long-bone geometry in columnar-limbed animals: Allometry of the proboscidean appendicular skeleton. Zoological Journal of the Linnean Society, 149(3), 423–436. https://doi.org/10.1111/j.1096-3642.2007.00249.x

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