Sperm in "Parhenogenetic" Freshwater Gastrotrichs

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Science  20 Jul 1979:
Vol. 205, Issue 4403, pp. 302-303
DOI: 10.1126/science.205.4403.302


Freshwater members of the phylum Gastrotricha have been considered obligate parthenogens. In Lepidodermelia squammata, the species for which there is most evidence for parthenogenesis, sperm have been discovered. This finding will necessitate reexamination of the nature of sexuality and life cycles and of the concept of "species" in freshwater gastrotrichs.