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An alciopid polychaete everting its proboscis. In english, it's a worm sticking out its throat which have jaws at the end for grabbing dinner. The eye of Vanadis is about 1mm in diameter, including photosensory cells and distinct lens. The photoreceptors are about 80 µm long and 6µm in diameter, and formed of microvilli. Wals and Rayport (1977) detemined the spectral sensitivity from the electroretinogram (ERG) of eyes of Torrea candida, a surface worm, and Vanadis, found in the deep sea, and concluded that they have image-resolving eyes. Therefore, highly developed imaging eyes evolved in annelid polychaetes.