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. 2014 Feb 6;9(2):e87737. doi: 10.1371/journal.pone.0087737

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© 2014 Gillian M

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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A. Typical long-stemmed physonect Bargmannia sp., with small anterior pneumatophore, many nectophores on an elongate nectosome and iterative cormidia on an elongate siphosome (MBARI); B. Atypical cystonect Physalia physalis, pleustonic (lives at surface), with much enlarged pneumatophore, no stem, cormidia arising directly from underside of pneumatophore (Casey Dunn © 2002); C. Atypical physonect Physophora hydrostatica, with pneumatophore, nectophores on an elongate nectosome and cormidia on a short-stemmed corm-like siphosome (Larry Madin © WHOI); D. Atypical physonect Athorybia rosacea, with rose-pink pneumatophore surrounded by rings of large bracts from cormidia on short-stemmed corm-like siphosome; no nectosome (Larry Madin © WHOI); E. Atypical physonect Dromalia alexandri, with enlarged penumatophore, ring of nectophores on short nectosome and whorls of iterative cormidia spiralling around corm from growth zone to corm base on short-stemmed siphosome (MBARI). Scale bars approximate.