Abstract
IN NATURE for November 16, 1911 (p. 78), I directed attention to the fact that a tiny annelid known as Rhyacodrilus had been found in England, and that it differed in some respects from the specimens recorded for Switzerland. Some difficulty was experienced by the Continental authorities in assigning it a place. Ditlevsen contended that it belonged rather to the Naididæ than to the Tubificidæ, but Michaelsen in his various publications refers it to the latter. In his “Süsswasserfauna Deutschlands” he specially distinguishes those annelids which reproduce by fission from those which form cocoons, and places the Naididæ in the former group, while the Tubificidæ are relegated to the latter. Then he places Rhyacodrilus (= Taupodrilus) among the Tubificidæ, because it is possessed of sexual organs.
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FRIEND, H. Naid or Tubificid?. Nature 91, 349 (1913). https://doi.org/10.1038/091349a0
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DOI: https://doi.org/10.1038/091349a0
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