Morphology of Melinnidae, Ampharetidae and Pectinariidae. (A) Melinna albicincta (Melinnidae, SIO-BIC A1113), arrows point towards the neuropodial aciculae on the ventro-lateral collar. (B) Samytha sexcirrata (Ampharetidae, Ampharetinae, SIO-BIC A1110) anterior body, the arrow points to the small notopodial spines (paleae) on Segment II. (C) Pectinaria granulata (Pectinariidae, SIO-BIC A9441), ventral view of head emerging from tube. (D) Pectinaria auricoma (Pectinariidae, SIO-BIC A1004), whole body in lateral view. Abbreviations: br—branchial pairs, pe—peristomium, pr—prostomium, te—buccal palps or tentacles. Roman numerals designate segment counts.