Myoanatomy of Myzostoma cirriferum (Annelida, Myzostomida): Implications for the evolution of the Myzostomid body plan

Authors

  • Conrad Helm,

    Corresponding author
    1. Molecular Evolution and Systematics of Animals, Institute of Biology, University of Leipzig, Talstraße 33, D-04103 Leipzig, Germany
    • Molecular Evolution and Systematics of Animals, Institute of Biology, University of Leipzig, Talstraße 33, D-04103 Leipzig, Germany
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  • Anne Weigert,

    1. Molecular Evolution and Systematics of Animals, Institute of Biology, University of Leipzig, Talstraße 33, D-04103 Leipzig, Germany
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  • Georg Mayer,

    1. Animal Evolution and Development, Institute of Biology, University of Leipzig, Talstraße 33, D-04103 Leipzig, Germany
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  • Christoph Bleidorn

    1. Molecular Evolution and Systematics of Animals, Institute of Biology, University of Leipzig, Talstraße 33, D-04103 Leipzig, Germany
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Abstract

Cover illustration. Myzostomida are an enigmatic subgroup of Annelida which diverged early during the phylogeny of annelids. Adult myzostomids show a highly specialized body plan, which lacks many of the typical annelid features. In this issue of the Journal of Morphology Helm et al. (pp. 456–466) report about an analysis of the musculature system of Myzostoma cirriferum using confocal laser-scanning microscopy. They support the annelid affinity of myzostomids and suggest that the apparent partial radial symmetry of M. cirriferum arose secondarily in this species.

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