Figure 4. A in Sleeping with the enemy: unravelling the symbiotic relationships between the scale worm Neopolynoe chondrocladiae (Annelida: Polynoidae) and its carnivorous sponge hosts

Figure 4. A, histological section of an elytron of Neopolynoe chondrocladiae from station CS-BT6 (specimen ID CS-BT6- 602-B2) presenting some microtubercles externally. B, detail of the mid-part of the elytron showing internally calixshaped photocytes (arrowed) arranged along the ventral side of the elytron. C, confocal microscopy picture of an elytron of N. chondrocladiae, ventral view. Brighter autofluorescent cells surrounding the elytrophore scar correspond to photocytes. Absorption spectrum showing a peak at 530 nm. D, confocal microscopy picture of an elytron of Neopolynoe acanellae, ventral view. Brighter autofluorescent cells to the right of the elytrophore scar correspond to photocytes. Absorption spectrum showing a peak at 530 nm. E, confocal microscopy picture of an elytron of Robertianella synopththalma, ventral view. Brighter autofluorescent cells around the elytrophore scar correspond to photocytes. Absorption spectrum showing a peak at 530 nm.