Pisa tetraodon (Pennant, 1777)
(Four-horned Spider Crab)

Taxonomic hierarchy:
SpeciesPisa tetraodon (Four-horned Spider Crab)
GenusPisa (a genus of spider crabs)
SubfamilyPISINAE (a subfamily of crustaceans)
FamilyEPIALTIDAE (a family of crustaceans)
SuperfamilyMAJOIDEA (a superfamily of crustaceans)
Subsection Heterotremata (a subsection (zoo.) of crustaceans)
Section Eubrachyura (a section (zoo.) of crustaceans)
InfraorderBrachyura (crabs)
SuborderPLEOCYEMATA (a suborder of crustaceans)
OrderDECAPODA (crabs, shrimps, lobsters etc.)
SuperorderEUCARIDA (crab, shrimps, lobsters etc.)
SubclassEUMALACOSTRACA (a subclass of crustaceans)
ClassMALACOSTRACA (crabs, lobsters, shrimps, prawns, woodlice etc.)
SubphylumCRUSTACEA (crustaceans)
PhylumARTHROPODA (arthropods)
SuperphylumECDYSOZOA (skin shedders)
CladeBilateria (bilaterally symmetrical animals)
SubkingdomEUMETAZOA (metazoans)
KingdomANIMALIA (animals)
DomainEukaryota (eukaryotes)
LifeBIOTA (living things)
Records of Pisa tetraodon (Four-horned Spider Crab) :
1: Pisa tetraodon (Four-horned Spider Crab)
22 Jan 2011 OSGR: SY67 50° 30’ N, 2° 30’ W Vice County: Dorset (VC 9) England
Two females, on isolated Japweed-covered concrete block, at ELWST
Image 1: Female - dorsal view - as found - white backgroundImage 2: Female - dorsal view - as found - white background (2)Image 3: Female - dorsal view - as found - white background (3)Image 4: Female - dorsal view - as found - white background (4)Image 5: Female - dorsal view - cleaned up a bit - white backgroundImage 6: Female - dorsal view - cleaned up a bit - white background (2)Image 7: Female - dorsal view - cleaned up a bit - white background (3)Image 8: Female - dorsal view - cleaned up a bit - white background (4)Image 9: Female - dorsal view - cleaned up a bit - white background (5)Image 10: Female - dorsal view - cleaned up a bit - white background (6)Image 11: Female - dorsal view - cleaned up a bit - white background (7)Image 12: Female - ventral view - white backgroundImage 13: Female - ventral view - white background (2)Image 14: Female - ventral view - white background (3)Image 15: Female - ventral view - white background (4)Image 16: Rostrum - dorsal view - close-up - enlargedImage 17: Rostrum - dorsal view - close-up - enlarged (2)Image 18: Rostrum - ventral view - close-up - enlarged
2: Pisa tetraodon (Four-horned Spider Crab)
8 Sep 2010 OSGR: SY67 50° 30’ N, 2° 30’ W Vice County: Dorset (VC 9) England
in shrimp net
Image 1: Carapace - dorsal view - close-up - white backgroundImage 2: Dorsal view - active - out of water - white backgroundImage 3: Dorsal view - closed-up - out of water - white backgroundImage 4: Latero-dorsal view - active - out of water - white backgroundImage 5: Chela - close-up - enlargedImage 6: Rostrum - dorsal view - close-up - enlargedImage 7: Rostrum - ventral view - close-up - enlarged
3: Pisa tetraodon (Four-horned Spider Crab)
28 Apr 2010 OSGR: SY67 50° 30’ N, 2° 30’ W Vice County: Dorset (VC 9) England
Male, on sand at low spring tide
Image 1: Male - dorsal view - out of water, on sandImage 2: Male - dorsal view - out of water, on sand (2)Image 3: Male - dorsal view - under water - white backgroundImage 4: Male - dorsal view - under water - white background (2)Image 5: Male - dorsal view - under water - white background (3)Image 6: Male - latero-dorsal view - out of water, on sandImage 7: Male - ventral view - out of water, on sandImage 8: Male - ventral view - out of water, on sand (2)Image 9: Male - ventral view - under water - white background

Pisa tetraodon (Four-horned Spider Crab) may be included in identification literature listed under the following higher taxa:

NBNNBN (data.nbn.org.uk) has a distribution map for Pisa tetraodon (Four-horned Spider Crab)
BioInfoBioInfo (www.bioinfo.org.uk) has 0 host/parasite/foodplant and/or other relationships for Pisa tetraodon (Four-horned Spider Crab)

A medium-sized spider crab with a pair of horns fused into a Y-shape on the front of the carapace. It may be found on the shore.

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