[1] They are commonly referred to as beak-thrower worms or bloodworms.

They are bright red, segmented, aquatic worms.

The proboscis worm Glycera is sometimes called bloodworm.[relevant?]

The Glyceridae are epi- and infaunal polychaetes that prey upon small invertebrates.

They are errant burrowers that build galleries of interconnected tubes to aid in catching their prey.