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. 2016 May 5;4:e1951. doi: 10.7717/peerj.1951

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© 2016 Miranda et al.

This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.

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Manania uchidai: (A) presence of interradial longitudinal muscles (mu); Calvadosia cruciformis: (B) absence of interradial longitudinal muscles (indicated by arrow). Cross-sections. Photo credit: Lucília Miranda.