Typical stages in the development of <i>Rhizostoma luteum</i> ephyra.

Stage 0 to 3. Stage 0 (A-D): Newly released ephyra; (A) Drawing of gastric system; (B) Oral view; (C) Aboral view; (D) Cross-shaped mouth without oral tentacles; Stage 1 (E-H): 48 h post-liberation; (E) Drawing of gastric system; (F) Enlargement of marginal lappets; (G) Side view; (H) Cross-shaped mouth with oral tentacles; Stage 2 (I-L): 3–4 days post-liberation; (I) Drawing of gastric system; (J) Oral view; (K) Enlargement of marginal lappets; (L) Cross-shaped mouth with oral tentacles; Stage 3 (M-P): 5–6 days post-liberation; (M) Drawing of gastric system; (N) Enlargement of marginal lappets; (O) Side view; (P) Enlargement of manubrium. Black gastric system, gf gastric filaments, lb lappet bud, ma manubrium, ml marginal lappets, ne nematocyst, ot oral tentacles, prc primary ring canal, rc rhopalar canal, rh rhopalium, rl rhopalar lappets, vc velar canal, vl velar lappets. Scale bar 1 mm for all except (D, F, H) 100 μm. Drawings by R. Halbauer. Photos by K. Kienberger.