FIGURE 4 A in Carlgren's hesitation allayed: redescription and systematics of Heteranthus verruculatus Klunzinger, 1877 (Cnidaria, Actiniaria), with a redefinition of Heteranthidae Carlgren, 1900

FIGURE 4 A clustering Heteranthus verruculatus (ZRC.CNI.1230) undergoing longitudinal fission. A, B. lateral stretching, with pedal-end extending the widest. Both column and pedal-ends inflate and deflate (arrowed) as the sea anemone pulls itself in opposite directions. C, D. column cleaved; continued stretching of actinopharynx that eventually splits, with distalmost end remaining (arrowed). E, F. pulling and splitting of the distalmost end of column where sphincter muscles are. Duration of observation is denoted at the top right-hand corner of each panel, time rendered in hours, minutes, and seconds (i.e., hh:mm:ss). Scale bar = 2 mm. Video screen capture by NWL Yap. For full video, refer to supplementary video S1.