Morphological changes associated with strobilation (induced by thyroxine) in Aurelia

Stage I. polyp. Note tenctacle morphology

Stage II. Note bulges and tenctacle swellings, segmentation

Stage III. Strobila. Note perradial tenctacle loos and rhopalia formation, mouth

Stage IV. Strobilia. Note interradial tentacle loss

Stage VIII. Free ephyra

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