Fig. 1. (A) Transverse slice through a polyp of Galaxea fascicularis
showing the oral epithelia (OEp) in relation to the skeleton (SK) and
extrathecal coelenteron (ETC). (B) Fluorescence image of the extrathecal
epithelia in a transverse slice of freeze-substituted G. fascicularis
polyp. OE, oral ectoderm; M, mesogloea; OG, oral gastrodermis; ETC,
extrathecal coelenteron; AG, aboral gastrodermis; CE, calicoblastic ectoderm;
SK, skeleton.