Glyceridae
| Glyceridae | |
|---|---|
| Glycera alba with everted proboscis | |
| Scientific classification | |
| Domain: | Eukaryota | 
| Kingdom: | Animalia | 
| Phylum: | Annelida | 
| Clade: | Pleistoannelida | 
| Subclass: | Errantia | 
| Order: | Phyllodocida | 
| Suborder: | Glyceriformia | 
| Family: | Glyceridae Grube, 1850 | 
| Genera | |
| 
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Glyceridae is a family of polychaete worms. 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. 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.