Abstract
THE Amphineura are usually considered to demonstrate many primitive features among the Mollusca. It is therefore surprising that more attention has not been given to a study of methods of reproduction in the group. Reference to the reproduction of various species is scattered through the literature; but there have been few attempts since Simroth1 to give a general account for the group. The sexes are separates and it is usually stated that fertilization is external, although one truly viviparous species has been long recognized and is usually quoted. It does not appear to be generally recognized that a complete series can be traced within the group from species in which fertilization is external through those which brood the eggs to a varying degree, to the single known viviparous species.
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DELL, R. Stages in the Development of Viviparity in the Amphineura. Nature 195, 512–513 (1962). https://doi.org/10.1038/195512b0
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DOI: https://doi.org/10.1038/195512b0
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