Vestibular labyrinth diversity in diprotodontian marsupial mammals

@inproceedings{Schmelzle2007VestibularLD,
  title={Vestibular labyrinth diversity in diprotodontian marsupial mammals},
  author={Thomas Schmelzle and Marcelo R. S{\'a}nchez-Villagra and Wolfgang Maier},
  year={2007}
}
ABSTRACT The bony labyrinth of specimens representing eight diprotodontian species were visualized by high-resolution computed tomography. Linear measurements of the labyrinth were taken, e.g., the height and width of the arc of each semicircular canal. The relative sizes and spatial arrangements of the semicircular canals were compared and some of the variation was atomized into 17 characters, which were then phylogenetically interpreted. There has been a change both in size and in relative… 
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The main functional morphological signal of the vestibular system is found in the diameter of the semicircular canals, and the locomotion mode of extinct taxa can be inferred in future studies independent of any evidence of postcranial material.
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Three‐dimensional geometric morphometrics used to examine the phylogenetic and ecological patterns of variation in the bony labyrinth morphology of the most species‐rich and ecologically diversified traditionally recognized superfamily of Carnivora, the Musteloidea found that the morphology of this sensory structure is not significantly influenced by bony Labyrinth size.
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Findings undermine efforts to determine specific locomotor behaviours from the bony labyrinth of extinct primates from two sets of closely related primate species that differ in the percentage of leaping in their locomotor repertoire.
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TLDR
The results strengthen support for a previously published hypothesis, according to which a relaxation of the selective pressure applied to the morphology of the bony labyrinth is the likely reason for this higher amount of intraspecific variation in slow-moving taxa, and that it may be related to a reduced functional demand for rapid postural adjustments.
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The curved cochlear canal and the pneumatized middle ear region support the hypothesis that Haldanodon had more effective low-frequency hearing as an adaptation to a fossorial mode of life.
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