Summary
Internal fertilization is demonstrated in the priapulid wormTubiluchus philippinensis by the electron microscopic observation of sperm in the urogenital duct of female animals. This finding is of interest in that all other members of this group thus far examined have exhibited external fertilization.
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Alberti, G., Storch, V. Internal fertilization in a meiobenthic priapulid worm:Tubiluchus philippinensis (Tubiluchidae, Priapulidia) . Protoplasma 143, 193–196 (1988). https://doi.org/10.1007/BF01291164
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DOI: https://doi.org/10.1007/BF01291164