Contents and search bar
Index of flora
Index of fauna
Kingdom Animale | Phylum Arthropoda | Subphylum Crustacea | Class Malacostrata
 
Photo by Tan Bee Hong
Uca vocans
Fiddler Crab
Uca
Family Ocypodidae

Order Decapoda
These crabs are noted for their extreme sexual dimorphism, i.e.,
Photo by Kang Nee
Uca annulipes
morphological differences between male and female animals. The adult males possess an enlarged claw and a smaller, normal one, while the females have two equal-sized small ones. Only the small claws, with their spoon-shaped tips are used for feeding. The larger claw is used for courtship, warning and fighting.
Two species are especially common in open sandy/muddy areas. U. annulipes has a black shell with blue or white stripes and a smooth orange to red claw, while the larger U. vocans has a greyish-blue body and large, rough orange claws. The colour of the females tend to vary. Another species occasionally encountered is the beautiful scarlet red U. rosea from mangroves. (Body up to 3crn in width).
Introduction
Shore environment
 
From A Guide to Seashore Life by Dr Leo W H Tan and Peter K L Ng
Published by the Singapore Science Centre and sponsored by BP

@Raffles Museum of Biodiversity Research and Singapore Science Centre