Fig. 2
From: The spatial pattern of bioluminescent flashes in the polychaete Eusyllis blomstrandi (Annelida)
Posterior end of a luminescing, intact Eusyllis blomstrandi. Note the elongate dorsal cirri (dark, filamentous contours projecting on either side of the trunk) originating in the middle of the segmental luminescent domains and the individual segmental patterns of small, accessory light sources in the vicinity of the main luminescent domains. In consecutive luminescent flashes, the same luminescent sites are involved. Stimulation by a touch with a needle