Tubifex tubifex

Tubifex tubifex
Scientific classification
Kingdom: Animalia
Phylum: Annelida
Class: Clitellata
Order: Oligochaeta
Family: Tubificidae
Genus: Tubifex
Species: T. tubifex
Binomial name
Tubifex tubifex
(Otto Friedrich Müller, 1774)
Tubifex, in Aa River (north of France) in a polluted zone, circa 1990

Tubifex tubifex, also called the sludge worm, or sewage worm, is a species of tubificid segmented worm that inhabits the sediments of lakes and rivers on several continents. Tubifex probably includes several species, but distinguishing between them is difficult because the reproductive organs, commonly used in species identification, are resorbed after mating, and because the external characteristics of the worm vary with changes in salinity. These worms ingest sediments, selectively digest bacteria, and absorb molecules through their body walls.

The worms can survive with little oxygen by waving hemoglobin-rich tail ends to exploit all available oxygen, and can exchange carbon dioxide and oxygen through their thin skins, in a manner similar to frogs. They can also survive in areas heavily polluted with organic matter that almost no other species can endure. By forming a protective cyst and lowering its metabolic rate, T. tubifex can survive drought and food shortage. Encystment may also function in the dispersal of the worm. They usually inhabit the bottom sediments of lakes, rivers, and occasionally sewer lines and outlets.[1]

In 2009, a large blobby mass made of colonies of Tubifex was found to be living in the sewers of Raleigh, North Carolina. Revealed by a snake camera inspection of sewer piping under the Cameron Village shopping center, videos of the creature went viral on YouTube in 2009 under the name "Carolina poop monster".[2]

References

Lake zones
Littoral zone
Limnetic zone
Profundal zone
Benthic zone
Lake stratification
Epilimnion
Metalimnion
Hypolimnion
Destratification
Lake types
Holomictic lake
   Monomictic lake
   Dimictic lake
   Polymictic lake
Meromictic lake
Amictic lake
Aquatic ecosystems
Wild fisheries
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