Fig. 10
From: The spatial pattern of bioluminescent flashes in the polychaete Eusyllis blomstrandi (Annelida)
A complete, brief flashing cycle emitted after a single mechanical shock (arrow) to the glass support carrying an intact Eusyllis blomstrandi of 58 segments trunk length. Note the amphidromous propagation of excitation in the early flashes accompanied by a shift of the starting points of the flashes towards the posterior end. In the later flashes, recruitment of luminescing segments runs from posterior towards anterior. Same animal as in Fig. 3. Coordinates and symbols as in Fig. 5