Morphology and Ultrastructure of the Amazon River Dolphin (Inia geoffrensis) Spermatozoa

Rodrigo S. Amaral (Lead / Corresponding author), Vera M. F. da Silva, Fabíola X. Valdez Domingos, Anthony R. Martin

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    The spermatozoa from seven adult Amazon river dolphins (Inia geoffrensis, CETACEA: INIIDAE) were analyzed by light and electron microscopy. The spermatozoa showed an elongated ellipsoid shaped head and a long tail with a well distinguishable midpiece. The head spermatozoa have a smooth surface like other odontocetes examined, with the exception of the Delphinidae family. The mean dimensions of the spermatozoa were within the range already reported for other cetaceans. The spermatozoa midpiece, as in other cetaceans, showed a random pattern of mitochondria, different from that described for other mammals. Further studies of sperm morphology of a wider spectrum of cetacean families could help to better understand the reproductive biology of these animals and the inter- and intra-generic relationships among them, as well as, among other mammals. This article is protected by copyright. All rights reserved.

    Original languageEnglish
    Pages (from-to)1519-1523
    Number of pages5
    JournalAnatomical Record: Advances in Integrative Anatomy and Evolutionary Biology
    Issue number8
    Early online date3 Mar 2017
    Publication statusPublished - Aug 2017


    • Amazon river dolphin
    • Cetacean
    • Inia geoffrensis
    • Reproduction
    • Sperm


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