Arboreal quadrupedism and forelimb articular anatomy of red howlers

Miguel A. Schön Ybarra

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


I describe the patterns of forelimb movements that facilitate adult red howling monkeys (Alouatta seniculus) to advance quadrupedally on arboreal trails in directions ± 45°from the horizontal, the articular surface morphology at the scapulohumeral and elbow joints, and the structure of the trails. Results indicate (1) that red howlers splay their forelimbs when advancing on arboreal trails of mesh-like substrates, but they do not splay them to proceed on unilineal arboreal trails, and (2) that the articular surfaces are adapted to enable the scapulohumeroulnar bony alignments that result in both splayed and nonsplayed forelimb motions. These results have implications for the locomotor habits of several fossil catarrhines.

Original languageEnglish (US)
Pages (from-to)599-613
Number of pages15
JournalInternational Journal of Primatology
Issue number3
StatePublished - 1998
Externally publishedYes


  • Alouatta seniculus
  • Arboreal route frameworks
  • Forelimbs
  • Howler
  • Joint rotations

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology


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