Saduria entomon

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Saduria entomon
Dead Saduria entomon washed up on the beach
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Order: Isopoda
Family: Chaetiliidae
Genus: Saduria
Species: S. entomon
Binomial name
Saduria entomon
(Linnaeus, 1758[1]

Saduria entomon is a benthic isopod crustacean of the family Chaetiliidae.[1] It is distributed along the coasts of the Arctic Ocean and of the northern Pacific Ocean. It is also found in the brackish Baltic Sea, where it is considered a glacial relict.[2] Moreover it is present in a number of North European lakes, including Ladoga, Vänern and Vättern. It has been introduced into the Black Sea.[3]

Saduria entomon is one of the largest crustaceans in the Baltic Sea. The largest ones are found in the depths of the Gulf of Bothnia,[4] being almost 9 centimetres (4 in) in length.[2] S. entomon are sexually dimorphic, with males growing larger and maturing at larger sizes than females.[5] Most individuals die after reproduction; the species may be functionally semelparous, but it is probably capable of iteroparity. Its lifespan is 3 years, possibly much longer.[5]

Saduria entomon is a predator that feeds on other benthic animals, such as Monoporeia affinis. It is also a scavenger and a cannibal.[2]


  1. ^ a b "Saduria entomon (Linnaeus, 1758)". Integrated Taxonomic Information System. Retrieved February 1, 2006. 
  2. ^ a b c "Saduria entomon". Aquascope. Retrieved 20 June 2010. 
  3. ^ Y. Kvach (2009). "First report of Saduria (Mesidotea) entomon (Linnaeus, 1758) (Isopoda: Chaetiliidae) in the Black Sea" (PDF). Aquatic Invasions 4 (2): 393–395. doi:10.3391/ai.2009.4.2.17. 
  4. ^ "Kilkki". The Baltic Sea Portal (in Finnish). Retrieved 20 June 2010. 
  5. ^ a b Haahtela, Ilpo (1990). "What do Baltic studies tell us about the isopod Saduria entomon (L.)?". Annales Zoologici Fennici 27: 269–278.