Common name: Bobbit Worm

Scientific name: Glycera unicornis Lamarck, 1818

General information

The Bobbit Worm, scientifically known as Glycera unicornis, is a fascinating yet fearsome polychaete worm found in warm marine waters. It is known for its striking appearance and predatory behavior. The worm's body can reach impressive lengths, sometimes exceeding a meter, and it is adorned with vibrant colors that can vary from specimen to specimen.

The name 'Bobbit Worm' was inspired by an infamous domestic incident in the United States, but the worm's actual behavior is even more dramatic. It is a stealthy predator, using its powerful jaws to snatch unsuspecting prey such as small fish and invertebrates.

Details

Recommended minimum tank volume
75 liter (20 gallons)
Salinity
S.G. 1.023 to 1.025
Temperature
22 to 26 °C (72 to 79 °F)
Acidity
pH 8.1 to 8.4
Average size
10 cm (4″)
Care level
Moderate to difficult Sensitive to water quality.
Diet
Carnivore Prefers live or frozen foods.
Reefsafe
No May prey on small invertebrates.
Aggression
Semi aggresive Can be predatory.
Captive bred
No

Taxonomy

  1. Kingdom
    Animals
    Animalia
  2. Phylum
    Segmented Worms
    Annelida
  3. Class
    Polychaetes
    Polychaeta
  4. Order
    Ragworms
    Phyllodocida
  5. Family
    Bloodworms
    Glyceridae
  6. Genus
    Bloodworms
    Glycera
  7. Species
    Bobbit Worm
    Glycera unicornis Lamarck, 1818
  8. Synonyms
    Glycera goesi Malmgren, 1867
    Glycera kraussii Stimpson, 1856
    Glycera meckelii Audouin & Milne Edwards, 1833
    Glycera mesnili Saint-Joseph, 1898
    Glycera nigripes Johnston, 1865
    Glycera rouxii Audouin & Milne Edwards, 1833

Care

Bobbit Worms are not commonly kept in home aquariums due to their predatory nature and potential size. However, they are sometimes inadvertently introduced into aquariums through live rock. If you decide to keep a Bobbit Worm, it is crucial to provide a deep sand bed for it to burrow and ample space to avoid conflicts with other tank inhabitants.

Reproduction

Little is known about the reproductive habits of Bobbit Worms in the wild or captivity. They are believed to reproduce by releasing gametes into the water column, where fertilization occurs externally.

Habitat

Bobbit Worms are typically found in sandy or muddy substrates in reef environments. They are adept at burrowing and can create complex tunnel systems where they lie in wait for prey. Their distribution is widespread in tropical and subtropical marine waters.