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Overview

Brief Summary

Just like other hermit crabs the small hermit crab lives inside an empty snail shell to protect its soft hind body. The left claw is considerably larger than the right. It's just the opposite by the common hermit crab. Furthermore, the small hermit crab is gray and while the common hermit crab is orange-red. The small hermit crab is a good example of what biologists call an invasive species. Sometimes they are present in huge amounts; other times there are only a few to be found. It's all related to the temperature of the sea water.
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Comprehensive Description

Description

 Diogenes pugilator is a yellowish-green hermit crab. Its carapace may reach up to 11 mm in length. Like all hermit crabs it has a soft and delicate abdomen that it protects with an otherwise empty snail shell. The abdomen is asymmetrical and twisted to fit inside the shell's coil. Diogenes pugilator differs from most hermit crabs by having the left claw considerably larger than the right (and not the other way round). Both claws are covered in minute hairs. Its carapace is a square shape and has tufts of hair on the upper left and right sides.
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©  The Marine Biological Association of the United Kingdom

Source: Marine Life Information Network

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Ecology

Habitat

Depth range based on 121 specimens in 1 taxon.
Water temperature and chemistry ranges based on 21 samples.

Environmental ranges
  Depth range (m): 0 - 33.2
  Temperature range (°C): 9.958 - 19.935
  Nitrate (umol/L): 0.576 - 8.636
  Salinity (PPS): 33.813 - 39.051
  Oxygen (ml/l): 5.136 - 6.339
  Phosphate (umol/l): 0.161 - 0.574
  Silicate (umol/l): 1.758 - 3.394

Graphical representation

Depth range (m): 0 - 33.2

Temperature range (°C): 9.958 - 19.935

Nitrate (umol/L): 0.576 - 8.636

Salinity (PPS): 33.813 - 39.051

Oxygen (ml/l): 5.136 - 6.339

Phosphate (umol/l): 0.161 - 0.574

Silicate (umol/l): 1.758 - 3.394
 
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 Diogenes pugilator is a benthic species usually inhabiting shallow intertidal waters down to 10 m but may less commonly be found in sandy bottom shelf areas down to about 35 m.
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©  The Marine Biological Association of the United Kingdom

Source: Marine Life Information Network

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Associations

In Great Britain and/or Ireland:
Animal / parasite / ectoparasite
Pseudione diogeni ectoparasitises branchial cavity of Diogenes pugilator

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Diogenes pugilator

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 5
Species With Barcodes: 1
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Wikipedia

Diogenes pugilator

Diogenes pugilator is a species of hermit crab, sometimes called the small hermit crab,[1] with a maximum carapace length of 5.45 mm (0.215 in).[2] It is found from the coast of Angola as far north as the North Sea, and eastwards through the Mediterranean Sea, Black Sea and Red Sea.[2] Populations of D. pugilator may be kept in check by the predatory crab Liocarcinus depurator.[3]

References

  1. ^ a b c Michael Türkay (December 21, 2004). "Diogenes pugilator (Roux, 1829)". In Patsy McLaughlin. World Paguroidea database. World Register of Marine Species. http://www.marinespecies.org/aphia.php?p=taxdetails&id=107199. Retrieved February 4, 2010.
  2. ^ a b David McGrath, Mark J. Costello and Chris Emblow (2000). "The hermit crab Diogenes pugilator (Roux, 1829) in Irish waters". Biology and Environment: Proceedings of the Royal Irish Academy 100B (2): 115–118. JSTOR 20500087. 
  3. ^ T. Tirelli, M. Dappiano, G. Maiorana & D. Pessani (2000). "Intraspecific relationships of the hermit crab Diogenes pugilator: predation and competition". Hydrobiologia 439 (1–3): 43–48. 
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