Medusa and Hydroids of Jellyfish

The order Anthoathecatae has many synonyms due partly to the length of time and number of people who have studied the interesting phylum Cnidaria.  Shown here are some solitary, free swimming medusa (1, 7 & 8 ) which are either male or female, a hydroid stage (9) which reproduces asexually either through budding of other hydroids, medusa or both (shown here as a complex hydroid).  Development of a medusa (evidently from a holomedusoid species) shows the progression of both endo- and ectoderm (en & ek respectively) (4, 5 & 6).