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On mammalian sperm dimensions.

J M Cummins, P F Woodall

    Journal of Reproduction and Fertility
    |September 1, 1985
    PubMed
    Summary
    This summary is machine-generated.

    Mammalian sperm size generally correlates inversely with body mass, with notable exceptions in bats. Sperm head dimensions remain relatively consistent across species, while midpiece and principal piece lengths drive variations.

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    Area of Science:

    • Comparative anatomy
    • Mammalian reproductive biology
    • Spermatozoa morphology

    Background:

    • Sperm dimensions are crucial for reproductive success and evolutionary studies.
    • Previous research has cataloged sperm morphology across various taxa, but comprehensive mammalian data remains limited.

    Purpose of the Study:

    • To present comprehensive data on linear sperm dimensions across a wide range of mammalian species.
    • To investigate the relationship between sperm size and body mass in mammals.
    • To identify patterns in sperm morphology variation across mammalian orders.

    Main Methods:

    • Compilation and analysis of existing data on mammalian sperm dimensions.
    • Statistical comparison of sperm size with body mass across different mammalian groups.

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  • Examination of variations in sperm head, midpiece, and principal piece lengths.

    • Main Results:

    • Data for 284 mammalian species were analyzed, covering significant proportions of genera and families.
    • A general inverse relationship between sperm size and body mass was observed, with exceptions in Chiroptera (bats).
    • Smallest spermatozoa were found in artiodactyls, and largest in marsupials, primarily due to variations in midpiece and principal piece lengths.

    Conclusions:

    • Mammalian sperm size exhibits significant variation, largely influenced by body mass.
    • Sperm head length is a conserved trait, while post-acrosomal sperm components show greater plasticity.
    • These findings contribute to understanding mammalian reproductive evolution and sperm competition dynamics.