Caudal vertebral body articular surface morphology correlates with functional tail use in anthropoid primates

Andrew S. Deane, Gabrielle A. Russo, Magdalena N. Muchlinski, Jason Organ

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Prehensile tails, capable of suspending the entire body weight of an animal, have evolved in parallel in New World monkeys (Platyrrhini): once in the Atelinae (Alouatta, Ateles, Brachyteles, Lagothrix), and once in the Cebinae (Cebus, Sapajus). Structurally, the prehensile tails of atelines and cebines share morphological features that distinguish them from nonprehensile tails, including longer proximal tail regions, well-developed hemal processes, robust caudal vertebrae resistant to higher torsional and bending stresses, and caudal musculature capable of producing higher contractile forces. The functional significance of shape variation in the articular surfaces of caudal vertebral bodies, however, is relatively less well understood. Given that tail use differs considerably among prehensile and nonprehensile anthropoids, it is reasonable to predict that caudal vertebral body articular surface area and shape will respond to use-specific patterns of mechanical loading. We examine the potential for intervertebral articular surface contour curvature and relative surface area to discriminate between prehensile-tailed and nonprehensile-tailed platyrrhines and cercopithecoids. The proximal and distal intervertebral articular surfaces of the first (Ca1), transitional and longest caudal vertebrae were examined for individuals representing 10 anthropoid taxa with differential patterns of tail-use. Study results reveal significant morphological differences consistent with the functional demands of unique patterns of tail use for all vertebral elements sampled. Prehensile-tailed platyrrhines that more frequently use their tails in suspension (atelines) had significantly larger and more convex intervertebral articular surfaces than all nonprehensile-tailed anthropoids examined here, although the intervertebral articular surface contour curvatures of large, terrestrial cercopithecoids (i.e., Papio sp.) converge on the ateline condition. Prehensile-tailed platyrrhines that more often use their tails in tripodal bracing postures (cebines) are morphologically intermediate between atelines and nonprehensile tailed anthropoids.

Original languageEnglish (US)
Pages (from-to)1300-1311
Number of pages12
JournalJournal of Morphology
Volume275
Issue number11
DOIs
StatePublished - Nov 1 2014

Fingerprint

Primates
Haplorhini
Tail
tail
Atelinae
Joints
Platyrrhini
Cebinae
vertebrae
Alouatta
Spine
surface area
Cebus
Hindlimb Suspension
Papio
Ateles
Body Surface Area
Cebidae
Posture
posture

Keywords

  • Atelinae
  • Caudal vertebrae
  • Cebinae
  • Curvature
  • Intervertebral disc articulation
  • Prehensile

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Developmental Biology
  • Medicine(all)

Cite this

Caudal vertebral body articular surface morphology correlates with functional tail use in anthropoid primates. / Deane, Andrew S.; Russo, Gabrielle A.; Muchlinski, Magdalena N.; Organ, Jason.

In: Journal of Morphology, Vol. 275, No. 11, 01.11.2014, p. 1300-1311.

Research output: Contribution to journalArticle

Deane, Andrew S. ; Russo, Gabrielle A. ; Muchlinski, Magdalena N. ; Organ, Jason. / Caudal vertebral body articular surface morphology correlates with functional tail use in anthropoid primates. In: Journal of Morphology. 2014 ; Vol. 275, No. 11. pp. 1300-1311.
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