Sex-differences in the canines of the gibbon (Hylobates lar)

@article{Frisch1963SexdifferencesIT,
  title={Sex-differences in the canines of the gibbon (Hylobates lar)},
  author={John E. Frisch},
  journal={Primates},
  year={1963},
  volume={4},
  pages={1-10}
}
Canine sexual dimorphism in Ardipithecus ramidus was nearly human-like
TLDR
The analysis of >300 fossils spanning 6 million years shows that male canine size reduction occurred early in human evolution, broadly coincident with the adoption of bipedality, and suggests a profound and evolutionarily deep sociobehavioral shift that minimized male–male aggression.
Craniodental Sexual Dimorphism Among Hylobatids
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The finding of male-biased sexual dimorphism in only some hylobatid taxa suggests that although male craniofacial morphology of some gibbon and siamang species may be associated with sex-specific agonistic interactions, this effect is not ubiquitous among hylOBatids.
Fighting for what it’s worth: participation and outcome of inter-group encounters in a pair-living primate, the Javan gibbon (Hylobates moloch)
TLDR
The results highlight that mate and infant defense are crucial for male Javan gibbons, especially in view of their pair-living system, long interbirth intervals, and slow infant development and suggest thatJavan gibbon females may advertise their reproductive status through singing during inter-group encounters while Javan Gibbon males rather participate to defend their mates and infants.
Intrasexually selected weapons
  • A. Rico-Guevara, K. Hurme
  • Environmental Science, Biology
    Biological reviews of the Cambridge Philosophical Society
  • 2018
TLDR
It is conceptualized that there are five ways in which a sexually dimorphic trait, apart from the primary sex traits, can be fixed: sexual selection, fecundity selection, parental role division, differential niche occupation between the sexes, and interference competition.
Deciduous canine morphology in recent Japanese
TLDR
The deciduous canines were generally quite similar in morphology and size between male and female, and the sexual dimorphism was significant for only the mesiodistal and labiolingual crown diameters of the upper deciduously canines.
Supplementary Online Information
Supplementary Table 1 The Shapiro-Senapathy matrix scores of authentic, mutated and cryptic/de novo 3' splice sites in exons Supplementary Table 2 The Shapiro-Senapathy matrix scores of authentic,
The Fossil Record and Evolutionary History of Hylobatids
The fossil record documenting the evolution of hylobatids is extremely poor, so details of their phylogenetic and geographic origins and subsequent evolutionary history are obscure. Based on
An analysis of canine size and jaw shape in some Old and New World non-human primates
TLDR
In females, the angle the jaw must be opened to clear the canine teeth was in most cases very small though in certain species elongated canines were found.
Dental and cranial variation in living Indriidae
TLDR
It is concluded that none of the four species of Indriidae is sexually dimorphic, and this lack of dental and cranial dimorphism is unusual in primates, and probably reflects the relatively limited aggressive behavior and the lack of male dominance in Indriaceae.
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References

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