Grapsidae Family

Family : Grapsidae

     (10 species present in Seychelles)

  Subfamily : Grapsinae, Macleay, 1838

   Genus : Grapsus Lamarck, 1801

     Species : Grapsus tenuicrustatus Herbst, 1783

Grapsus tenuicrustatus
Scientific name :Grapsus tenuicrustatus Herbst, 1783
English name :Rock crab, Lightfooted crab
Creole name :Karkasay
Family :Grapsidae
Seychelles :Make, Praslin, Coetivy,
Aride (Anderson, 1994)
World :Indo-Pacific area and from the Red sea
to Natal on the African Coast (Vannini and Valmori, 1981a).
Ecology :
Habitat :Exposed rocky shores near the sea, usually on cliffs
Diet :Algae on rocks
Activity :diurnal
Burrowing : No
Description :
Size :Carapace width : 65 mm, length : 61 mm. Their empty exoskelet can very often be obseved washed on the shore.
Colour :Body and legs reddish brown marbled with green. Claws external face red, tips and internal face white (Vannini and Valmori, 1981a).
Morhological remarks :Easily distinguished from the other Grapsus of this area by its white tips (Holthuis, 1977).
Differences in sexes :
Picture :Grapsus tenuicrustatus


Grapsus fourmanoiri

     Species : Grapsus fourmanoiri Crosnier, 1965

Grapsus fourmanoiri
Scientific name :Grapsus fourmanoiri Crosnier, 1965
English name :
Creole name :Karkasay
Family :Grapsidae
Distribution :
Seychelles :Mahe, Praslin
World :Yet to be defined (Hartnoll, 1975).
Ecology :
Habitat :Rocky cliffs, platforms and tidal pools and under stones near the sea.
Diet :Algae on rocks
Activity :diurnal
Burrowing : No
Description :
Size :Carapace width : 33 mm, length : 29 mm
Colour :The greenish yellow colour of the carapace and leg margins is very characteristic.
Differences in sexes :
Picture :Grapsus fourmanoiri


     Species : Grapsus longitarsis Dana, 1851

Scientific name :Grapsus longitarsis Dana, 1851
English name :
Creole name :Karkasay
Family :Grapsidae
Distribution :
Seychelles :Mahe, Praslin
World :Known in Indonesia, Taiwan, Tuamotu and Hawai (Vannini and Valmori, 1981a).
Ecology :
Habitat :Rocky cliffs, platforms and tidal pools.
Diet :Algae on rocks
Activity :diurnal
Burrowing : No
Description :
Size :Carapace width : 33 mm, length : 29 mm. Their empty exoskelet can very often be obseved washed on the shore.
Colour :Legs yellow. Carapace yellow marbled with reddish brown. Claws yellow on both faces, tips dark (Vannini and Valmori, 1981a).
Differences in sexes :
Picture :Grapsus longitarsus
Photo from J.Poupin : Crustacea Decapoda and Stomatopoda of French Polynesia


   Genus : Geograpsus Stimpson, 1858

     Species : Geograpsus grayi H. Milne Edwards, 1853

Scientific name :Geograpsus grayi H. Milne Edwards, 1853
English name :
Creole name :
Family :Grapsidae
Distribution :
Seychelles :Coetivy, Aride (Anderson, 1994)
World :Very common in Madagascar and all the Indian Ocean islands. (Vannini and Valmori, 1981a).
Ecology :
Habitat :Inland on sandy soil
Diet :
Activity :nocturnal
Burrowing : Yes
Description :
Colour :Blue on top of the carapace and yellow and white on the sides
Size :
Differences in sexes :
Picture :Geograpsus grayi
Geograpsus grayi


   Genus : Metopograpsus H. Milne Edwards, 1853

   Genus : Pachygrapsus Randall, 1840

   Genus : Pseudograpsus H. Milne Edwards, 1837

   Genus : Percnon Gistel, 1848

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Other Links to Seychelles and Land crabs

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