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Cranial and mandibular morphometry in Leontopithecus Lesson, 1840 (Callitrichidae, primates).

C H Burity1, C A Mandarim-De-Lacerda, A Pissinatti

  • 1Department of Anatomy, Institute of Biology, State University of Rio de Janeiro (UERJ), Brazil. burity@rio.com.br

American Journal of Primatology
|June 25, 1999
PubMed
Summary

Lion tamarin species show distinct cranial and mandibular differences. This craniometric analysis reveals key morphological variations, aiding in species identification and understanding evolutionary divergence in the Leontopithecus genus.

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Area of Science:

  • Primatology
  • Comparative Anatomy
  • Evolutionary Biology

Background:

  • Lion tamarins (Leontopithecus) comprise several species with potential morphological variations.
  • Understanding cranial and mandibular differences is crucial for taxonomy and evolutionary studies.

Purpose of the Study:

  • To conduct a craniometric analysis comparing four species of lion tamarins: Leontopithecus rosalia, L. chrysomelas, L. chrysopygus, and L. caissara.
  • To identify specific cranial and mandibular measurements that best distinguish between these species.

Main Methods:

  • Seventeen cranial and mandibular measures were collected from 59 adult lion tamarin skulls.
  • Statistical analyses included one-way ANOVA (Bonferroni test) and discriminant analysis, with size-corrected methods.
  • Mahalanobis distance was computed to assess group centroids.

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Main Results:

  • Significant differences in cranial and mandibular morphology were found among Leontopithecus species.
  • Cranial base length and orbital breadth were key differentiating measures across sexes and species pairs.
  • Discriminant analysis achieved high correct classification rates for crania (96.6%) and mandibles (69.5%).

Conclusions:

  • Craniometric data confirm significant morphological distinctions among lion tamarin species.
  • Leontopithecus caissara exhibits discernible cranial morphological distances from L. chrysopygus, warranting further investigation.
  • Cranial and mandibular morphology provides a reliable basis for differentiating Leontopithecus species.