Giorgos Chatzigeorgiou*, Elena Sarropoulou, Katerina Vasileiadou, Christina Brown, Sarah Faulwetter, Giorgos Kotoulas and Christos D. Arvanitidis 1 Biology Department, University of Crete, Heraklion, Greece 2 Hellenic Centre for Marine Research, Institute of Marine Biology, Biotechnology and Aquaculture, Heraklion, Greece 3 Department of Biology, Chemistry and Pharmacology, Institute of Biology...

Abstract Annelids and particularly polychaetes possess a great variety of sensory organs respond to numerous stimuli. Although eyes nuchal are comparatively well studied, the so-called dorsal among lesser-known sense in aquatic annelids. Moreover, they known be restricted only two out approximately 80 families polychaetes—Orbiniidae Spionidae—which not closely related. These have been regarded ...