Markus Bastir
Phone: +34 91 566 8976
Address: Dr. Markus Bastir
Department of Paleobiology
Museo Nacional de Ciencias Naturales CSIC
Address: Dr. Markus Bastir
Department of Paleobiology
Museo Nacional de Ciencias Naturales CSIC
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Papers by Markus Bastir
important for understanding human body shape
and evolution. Research has shown that in the
lower thorax, sexual dimorphism and allometry
produce wider ribcages in larger males and
narrower ones in smaller females. If the pelvis
and thorax are integrated, we would expect that
the upper pelvis would similarly be wider in larger
males and narrower in smaller females. Within
this framework of torso integration, we explore
allometry and sexual dimorphism in ossa coxae.
From a human sample with variation in body
size (25 males, 25 females, Bass Collection;
N=3 small-bodied humans, AMNH), we measured
142 (semi)landmarks on coxal bones and
analyzed them using Geometric morphometrics.
These results explore how sexual dimorphism
and allometry affect torso width measured from
pelvis morphology compared to previous studies
of the ribcage. Males and females differ both allometrically
and non-allometrically. Allometrically,
smaller individuals have wider ossa coxae than
larger individuals, regardless of sex; non-allometrically,
females have a wider pelvic inlet than
males, presumably due to obstetric adaptations.
Both findings contradict previous results on lower
ribcage dimensions. Our results show that while
allometry and sexual dimorphism are important
factors explaining ossa coxae morphology, they affect the pelvis and thorax differently, challenging
the torso integration model. Morphological and
positional relations between both hip bones and
the sacrum could account for this. However, interactions
between 3D-pelvis shape and size and
stature are likely important in the context of pelvis
reconstructions and body shape in small-bodied
humans and hominins.