Squilla mantis

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Squilla mantis
Squilla mantis - Naturmuseum Senckenberg - DSC02132.JPG
Squilla mantis
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Order: Stomatopoda
Family: Squillidae
Genus: Squilla
Species: S. mantis
Binomial name
Squilla mantis
(Linnaeus, 1758)
Synonyms [1]

Cancer mantis Linnaeus, 1758

Squilla mantis is a species of mantis shrimp found in shallow coastal areas of the Mediterranean Sea and the Eastern Atlantic Ocean. Its abundance has led to it being the only commercially fished mantis shrimp in the Mediterranean.

Description[edit]

Individuals grow up to 200 millimetres (8 in) long,[2] and is of the spearer type.[3] It is generally dull brown in colouration, but has two brown eye spots, circled in white, at the base of the telson.[4] Other species – including smashers – are also sold in the aquarium trade as Squilla mantis.[5]

Distribution and ecology[edit]

Front half of S. mantis, showing the (pale-coloured) spearing raptorial claws

S. mantis digs burrows in muddy and sandy bottoms near the coasts of the Mediterranean Sea and adjacent warm parts of the eastern Atlantic Ocean.[2] It remains in its burrow during the day and comes out at night to hunt, and in the winter to mate.[6]

It is found around the entire coast of the Mediterranean, and in the Atlantic Ocean south from the Gulf of Cádiz to Angola, as well as around the Canary Islands, and Madeira. It has historically been recorded from the Bay of Biscay and the British Isles, but is not known to occur there any more.[6] It is particularly abundant where there is significant run-off from rivers, and where the substrate is suitable for burrowing. In the Mediterranean, the outflows from the Nile, Po, Ebro and Rhône provide these conditions.[6]

The alpheid shrimp Athanas amazone often lives in the burrows of S. mantis, despite being of a similar size to other shrimp which S. mantis feeds on.[7] The relationship between the two species remains unknown, although a second similar case has been reported for the species Athanas squillophilus in the burrows of Oratosquilla oratoria in Japanese waters.[8]

Fishery[edit]

Squilla mantis for sale at a Catalan market

S. mantis is the only native stomatopod to be fished for on a commercial scale in the Mediterranean. Over 7,000 t is caught annually, 85% of which is caught on Italian shores of the Adriatic Sea,[9] with further production in the Ionian Sea, off Sardinia, off the coast of Catalonia and off the Balearic Islands.[6] It is mostly taken as by-catch of other fisheries (including for sole), and commercial interest derives from the species' abundance rather than its market value.[6]

References[edit]

  1. ^ WoRMS (2011). "Squilla mantis (Linnaeus, 1758)". World Register of Marine Species. Retrieved November 25, 2011. 
  2. ^ a b Cédric d'Udekem d'Acoz (2003). "Squilla mantis". Crustikon – Crustacean photographic website. Tromsø MuseumUniversity of Tromsø. Archived from the original on October 14, 2008. Retrieved August 26, 2007. 
  3. ^ Roy Caldwell. "External anatomy and explanatory notes". Roy's List of Stomatopods for the Aquarium. University of California Museum of Paleontology. Retrieved August 26, 2007. 
  4. ^ Wolfgang Schneider (1990). "Stomatopods". Field Guide to the Commercial Marine Resources of the Gulf of Guinea. FAO Regional Office for Africa. p. 191. ISBN 92-5-103048-0. 
  5. ^ "Mantis shrimp". togar.de. Retrieved August 26, 2007. 
  6. ^ a b c d e F. Maynou, P. Abelló & P. Sartor (2004). "A review of the fisheries biology of the mantis shrimp, Squilla mantis (L., 1758) (Stomatopoda, Squillidae) in the Mediterranean". Crustaceana 77 (9): 1081–1099. doi:10.1163/1568540042900295. 
  7. ^ C. Froglia, R. James & A. Atkinson (1998). "Association between Athanas amazone (Decapoda: Alpheidae) and Squilla mantis (Stomatopoda: Squillidae)". Journal of Crustacean Biology 18 (3): 529–532. doi:10.2307/1549417. JSTOR 1549417. 
  8. ^ K.-I. Hayashi (2002). "A new species of the genus Athanas (Decapoda, Caridea, Alpheidae) living in the burrows of a mantis shrimp". Crustaceana 75 (3–4): 395–403. doi:10.1163/156854002760095462. 
  9. ^ "Global Production Statistics 1950-2005". Food and Agriculture Organization. Retrieved August 26, 2007. 

External links[edit]