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Related Experiment Videos

Internal fertilization in an oviparous frog.

D S Townsend, M M Stewart, F H Pough

    Science (New York, N.Y.)
    |April 24, 1981
    PubMed
    Summary

    Internal fertilization occurs in the oviparous frog Eleutherodactylus coqui. This finding challenges assumptions about anuran reproductive strategies, suggesting a need to review existing interpretations.

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    Area of Science:

    • Herpetology
    • Reproductive Biology
    • Amphibian Ecology

    Background:

    • Anuran amphibians are typically assumed to exhibit external fertilization.
    • This assumption influences the interpretation of reproductive strategies and evolutionary pathways in frogs and toads.
    • Oviparous anurans, laying eggs externally, are often grouped with species assumed to have external fertilization.

    Purpose of the Study:

    • To investigate the mode of fertilization in the oviparous frog Eleutherodactylus coqui.
    • To determine if internal fertilization occurs in a species previously assumed to follow external fertilization patterns.
    • To assess the implications of this finding for the broader understanding of anuran reproductive biology.

    Main Methods:

    • Detailed anatomical and reproductive studies of Eleutherodactylus coqui specimens.
    • Observation of reproductive behaviors in natural and controlled environments.
    • Histological examination of reproductive tissues to confirm fertilization status.

    Main Results:

    • Eleutherodactylus coqui, an oviparous frog, demonstrates internal fertilization.
    • Evidence confirms sperm presence and fertilization events occurring within the female reproductive tract prior to oviposition.
    • This contrasts with the widely held assumption of external fertilization in oviparous anurans.

    Conclusions:

    • The reproductive strategy of Eleutherodactylus coqui includes internal fertilization, challenging established paradigms.
    • Findings necessitate a re-evaluation of anuran reproductive strategies, particularly for oviparous species.
    • Future research should explore the prevalence of internal fertilization across diverse anuran taxa.

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