Prostomium shapes

Here are some of the prostomium shapes of various families of polychaetes:

rounded:Lysaretidae	rounded:Onuphidae
rounded:Phyllodocidae	rounded:Lacydoniidae

conical:Arabellidae	conical:Nereidae
conical:Paraonidae

fused

bilobed:Eunicidae

bilobed:Sabellidae

pentagonal:Nephtyidae

rectangular:Alciopidae