Sentence Examples


  • They typically present two structural forms, the non-sexual hydroid and the sexual medusoid; in such a case there is an alternation of generations (metagenesis), the hydroid giving rise to the medusoid by a sexual gemmation, the medusoid bearing sexual cells which develop into a hydroid.
  • In some other cases medusoid develops directly from medusoid (hypogenesis), whether by sexual cells or by gemmation.