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Cryptosoma cristatum

 

 

CALAPPIDAE
box crabs

  Cryptosoma cristatum
Brullé, 1837

Relevant Synonyms
Cycloes cristata Garcia Raso, 1993

Misidentification
-

 drawing : Tuvia Kurz    

SHORT DESCRIPTION
Carapace pentagonal, convex. Front narrow, bidentate. Antero-lateral margins of carapace arcuate, coarsely granulate; lateral spine small; postero-lateral margins convergent. Chelipeds massive, subequal. Upper margin of palm crested, with nine foliate lobes; keel-like tooth proximally near lower margin; larger dactylus proximally with crochet tooth fitting into molariform depression, with milled ridge distally. Walking legs laterally compressed, dactyls styliform. First male pleopod stout, tapering; second male pleopod filamentose, distally crook-shaped.

color : carapace pale yellow, with pink spots; chelipeds internal surface marbled and spotted with purplish pink; walking legs yellow, joints spotted with purplish pink.

common size : CL males 5.9 cm.

DISTINGUISHING CHARACTERISTICS
Differs from Calappa spp. in having postero-lateral margins of carapace convergent, and from Ashtoret in having walking legs end in styliform dactyls.

BIOLOGY / ECOLOGY
Ovigerous females collected in March, May, August, October and December.

habitat : sandy or coralligenous bottoms; 2-75 m.


1st MEDITERRANEAN RECORD
Alboran Sea, Spain, 1993 [1987].


DISTRIBUTION
Worldwide : Tropical eastern Atlantic. Mediterranean : a single record from Alboran Sea, Spain (García Raso, 1993 [1987]).

ESTABLISHMENT SUCCESS
Known from a single record.

speculated reasons for success :
-


MODE OF INTRODUCTION
Unknown.


IMPORTANCE TO HUMANS
None.


KEY REFERENCES

  • Galil B.S. and P.F. Clark, 1996. A revision of Cryptosoma Brullé, 1837 and Cycloes de Haan, 1837 (Crustacea: Brachyura: Calappidae). Zoological Journal of the Linnaean Society, 117: 175-204.
  • García Raso J.E., 1993. New record of another African species of Crustacea Decapoda, Cycloes cristata (Brullé) from European and Mediterranean waters. Bios, 1(1): 215-221.

 

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Last update of the species sheet:
November 2002

©ciesm 2002