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Entotympanics, ontogeny and primates.

R D MacPhee

    Folia Primatologica; International Journal of Primatology
    |January 1, 1979
    PubMed
    Summary

    Independent entotympanics are absent in living primates. The study refutes claims of primate ties to other mammals based on uncertain entotympanic homologies.

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    Area of Science:

    • Paleontology
    • Evolutionary Biology
    • Comparative Anatomy

    Background:

    • The presence of entotympanic bones in mammals is a key feature in evolutionary studies.
    • Previous assumptions suggested potential links between primates and other eutherians based on entotympanic presence.

    Purpose of the Study:

    • To investigate the presence and homology of entotympanic bones in primate evolution.
    • To critically evaluate the taxonomic significance of entotympanics for understanding primate origins.

    Main Methods:

    • Ontogenetic analysis of primate development.
    • Embryological interpretation of tympanic structures.
    • Review of paleontological and systematic literature on entotympanic homologies.

    Main Results:

    • Independent entotympanics are confirmed absent in extant primates.
    • Embryological evidence refutes the interpretation of primate tympanic cartilage as a suppressed entotympanic.
    • Homology issues with entotympanics limit their taxonomic value for distant groups.

    Conclusions:

    • The study definitively rules out independent entotympanics in living primates.
    • Unresolved entotympanic homology problems weaken claims of primate relationships with entotympanic-bearing eutherians like bats and tree shrews.
    • The findings challenge previous hypotheses on early primate ancestry based on entotympanic evidence.

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