Bloodworm

Scientific Name: Glycera dibranchiata

Order & Family: Order: Phyllodocida; Family: Glyceridae

Size: Commonly 5 cm to 35 cm (2 to 14 inches) in length.

Bloodworm

Natural Habitat

Coastal marine environments, typically found in soft silty or muddy sediments in estuaries or tidal flats.

Diet & Feeding

They are carnivorous and use a venomous proboscis to capture small crustaceans, other worms, and organic debris.

Behavior Patterns

Active burrowers that stay hidden in sediment. They use a distinct, four-jawed proboscis for hunting and defense. They are also known for their reddish-pink color due to hemoglobin.

Risks & Benefits

They have a painful, venomous bite which can cause localized swelling and may cause allergic reactions in some individuals. Environmentally, they are essential bait for fishing and a food source for fish and birds.

Identified on: 1/6/2026