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[2][3]

Oniscus entomon Linnaeus, 1758
Mesidotea entomon (Linnaeus, 1758)[3]

Saduria entomon is a benthic isopod crustacean of the family Chaetiliidae.[2][3] 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.[4] Moreover, it is present in a number of North European lakes, including Ladoga, Vänern and Vättern. It has been introduced into the Black Sea.[5]

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,[6] reaching a maximum length of nearly 9 cm (4 in).[4] S. entomon are sexually dimorphic, with males growing larger and maturing at larger sizes than females.[7] Most individuals die after reproduction, and the species might be functionally semelparous, but it is probably capable of iteroparity. Its lifespan is 3 years, possibly much longer.[7]

Saduria entomon is a predator that feeds on other benthic animals, such as Monoporeia affinis. It is also a scavenger and a cannibal.[4]


  1. ^ HELCOM Red List Benthic Invertebrate Expert Group (2013). "Saduria entomon" (PDF). HELCOM Red List of Baltic Sea. HELCOM. Retrieved 17 May 2016. 
  2. ^ a b "Saduria entomon (Linnaeus, 1758)". Integrated Taxonomic Information System. Retrieved February 1, 2006. 
  3. ^ a b c Guiry, Michael D. (2009). M. Schotte, C. B. Boyko, N. L. Bruce, G. C. B. Poore, S. Taiti & G. D. F. Wilson, eds. "Saduria entomon (Linnaeus, 1758)". World Marine, Freshwater and Terrestrial Isopod Crustaceans database. World Register of Marine Species. Retrieved 17 May 2016. 
  4. ^ a b c "Saduria entomon". Aquascope. Retrieved 20 June 2010. 
  5. ^ 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. 
  6. ^ "Kilkki". The Baltic Sea Portal (in Finnish). Retrieved 20 June 2010. 
  7. ^ a b Haahtela, Ilpo (1990). "What do Baltic studies tell us about the isopod Saduria entomon (L.)?" (PDF). Annales Zoologici Fennici. 27: 269–278.