Shovel head worms from Wales to West Africa

From my recent musings you may have deduced that my research is centred around a beautiful group of marine bristleworms, which are given the name shovel head worms. Most people will be unfamiliar with shovel head worms, but they may have come across other marine bristleworms such as ragworms and lugworms used as bait by sea fisherman (the latter also being responsible for the casts of sand you see on sandy beaches), or the ornamental feather duster worms that people often keep in aquaria.