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. 2018 May 8;6:e4596. doi: 10.7717/peerj.4596

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©2018 Ereskovsky 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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(A) Dysidea incrustans. (B) Protosuberites denhartogi. (C) Spicules of Clathria (Microciona) cleistochela: a, isochela; b, toxas; c,d, small choanosomal subtylostyles; e,f, large choanosomal subtylostyles; g,h, ectosomal subtylostyles. (D) Skeleton of Halichondria bowerbanki and skeleton. (E) Skeleton of Haliclona sp. 1. (F) Skeleton of Haliclona sp. 2. (G) Skeleton of Haliclona sp. 3. (H) Spicules of Pione cf. vastifica. Photographs by Alexander Ereskovsky.