0]                                              *Chlorohydra viridissima; Cnox*-0                                                                                  **polyp:** oral                                                                                                                                                            Schummer et al., 0000; [@pone.0000000-Schummer0]                                               *Hydra magnipapillata*; *Cnox*-0                                                                                        ???                                                                                                                                                                     Naito et al., 0000; 