18 Aeolidia alderi

18 Aeolidia alderi

The distinctive spawn mass of A. alderi is a deeply sinuous line arranged loosely in a disc. The easily seen sections containing large, white ova each form large radiating loops which are separated by virtually invisible sections lacking ova. The total effect somewhat resembles the petals of a flower.
Mediterranean coast of France, April 2022. © CC_BY_NC, S. Le Bris.