Adult medusae from polyps of Nausithoe sp. AC10 (A–C) and AC20 (D–H) A beginning of gonad (g) development B two gonads with gametic cells still differentiating C general view of a medusa that we managed to maintain until the gonads emerged (note degree of irregularities in this specimen, due to the long period in cultivation) D aboral view of 3-month-old medusa, showing the radial muscle (rm), marginal lappets (ml), rhopalium (r), and tentacles (t) E detail of 6-month-old medusa, showing gastric filaments (gf), rhopalium with ocelli (e), and statocyst (s), and coronal groove (cg); note, no trace of gonad development F, G and H Oral view of medusae, showing lips (l) and projection of the manubrium, from less projected (F) to more projected (H).