Evolutionary trends in sperm structure.

B Baccetti

doi:10.1016/0300-9629(86)90457-3

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Evolutionary trends in sperm structure.

B Baccetti

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Abstract

In the marine invertebrates which practise external fertilization, the spermatozoon is a flagellate cell, possessing an acrosomal complex made up of acrosome and perforatorium. In the animal phyla which adapted to land after having achieved internal fertilization the spermatozoon has acquired an elongated shape and develops accessory cytoskeletal organelles in the tail. In the highest forms, the flagellum seems to have become too long for perfect motility; in such a condition, aberrant axonemal patterns can appear and aflagellate spermatozoa can also be found. At the apex of the terrestrial phyla, alternative motile apparatuses have been achieved and also the acrosomal complex varies, according to the different structures of egg envelopes.

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Animals Biological Evolution Fertilization Fishes Flagella Insecta Male Microscopy, Electron Species Specificity Sperm Tail Spermatozoa Comparative Study Journal Article Research Support, Non-U.S. Gov't

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B Baccetti. 1986. Evolutionary trends in sperm structure.. https://doi.org/10.1016/0300-9629(86)90457-3

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