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. 2011 Jul 22;6(7):e21670. doi: 10.1371/journal.pone.0021670

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This is an open-access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 public domain dedication.

This is an open-access article distributed under the terms of the Creative Commons Public Domain declaration, which stipulates that, once placed in the public domain, this work may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose.

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(A) Stylaster galapagensis, USNM 72099, a typical cyclosystem, (B) Stylaster roseus, USNM 47807, a cyclosystem with a narrow adcauline diastema, (C) Conopora tetrastichopora, USNM 87566, a cyclosystem with a wide adcauline diastema, (D) Stylaster atlanticus, USNM 71824, a cyclosystem with some obsolete adcauline dactylopores, (E) Distichopora vervoorti, RMNH 23976, distichoporine arrangement of pores, (F) Crypthelia dactylopoma, USNM 72110, a cyclosystem with a narrow fixed lid, (G) Stylaster laevigatus, USNM 71798, gastropore shelf, (H) Errinopora pourtalesii, USNM 52254, a robust dactylostyle, (I) Stylaster miniatus, USNM 72151, a robust dactylostyle in apical view, (J) Distichopora dispar, USNM 85116, dactyloridges, (K) Inferiolabiata labiata, USNM 59951, lateral dactylostyles, (L) Lepidotheca robusta, USNM 85106, pseudotabulae in a dactylopore spine.