Véra Eisenmann

Correlations between skull and mandible dimensions

Thursday 16 April 2009

BASILAR LENGTH AND MAXIMAL MANDIBULAR LENGTH IN ALLOHIPPUS AND EXTANT EQUUS:

SKULL-MANDIBLE CORRELATIONS

1. Skull and Mandible lengths

For a sample of 375 various extant Equus skulls and mandibles, the correlation is good: R2=0.97.

Regressions are:

 Basilar length of the skull (1) = [1.1775 * Maximal length of the mandible (1)] - 16.957.
 Maximal length of the mandible (1) = [0.8257 * Basilar length of the skull (1)] + 25.448.

2. Muzzle lengths

For a sample of 161 various extant Equus skulls and mandibles, the correlation is smaller: R2 = 0.89.

Regressions are:

 Skull muzzle length (5) = [1.0318 * mandible muzzle length (12)] + 7.9216.
 Mandible muzzle length (12) = [0.8645 * skull muzzle length (5)] + 4.507.

3. Muzzle widths

For a sample of 336 extant Equus, the correlation R2 is only 0.80.

Regressions are:

 Skull muzzle width (17) = [0.796 * mandible muzzle width (7)] + 16.8043.
 Mandible muzzle width (7) = [1.0105 * skull muzzle width (17)] - 6.187.

(1), (5), (7), (17) refer to the illustrated system of measurements of skulls and mandibles.

 Longueur basilaire sur Longueur de la mandibule
 Longueur de la mandibule sur Longueur basilaire
 Longueur du museau crânien sur Longueur du museau de la mandibule
 Longueur du museau de la mandibule sur Longueur du museau crânien
 Largeur du museau crânien sur Largeur du museau de la mandibule
 Largeur du museau de la mandibule sur Largeur du museau crânien


Attached documents

Basilar Length and Maximal Mandibular Length

7 March 2021
info document : Excel
13.8 KiB

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