crustacea text index | photo index
Phylum Arthropoda > Subphylum Crustacea > Class Malacostraca > Order Decapoda
Photo index of crabs on Singapore shores
Small crabs: body width < 3 cm except those with long eyestalks
size indicated is for body width

Leaf porter crab
Family Dorippidae

Elbow crab
Family Parthenopidae

Arrow-head spider crab
Menatheius sp.

Masked burrowing crab
Family Corystidae

Pebble crab
Family Leucosiidae
1.5cm. Circular body with long antennae. Two pairs of long fringed swimming legs and two pairs of much shorter legs bent over the back to hold onto a leaf or shell. Mangroves, seagrasses, also near reefs. Commonly seen on our Northern shores.
1-2cm. With elongated pincers much longer than the body. Body triangular or pentagonal. Found among seaweeds. Seagrasses and seaweeds. Commonly seen on our Northern shores. 0.5-1cm. Body flat triangular. Walking legs and pincers long. Seagrasses and seaweeds. Sometimes seen on some of our shores. 3cm. Body is oval, antennae very long and feather-like, legs flattened, spade-like. Usually buried with only antennae sticking out. Rarely seen. 1-2cm. Body smooth and pebble like with a blunt pointed head. Large powerful pincers with pointed claws. Silty, sandy areas near seagrasses. Sometimes seen on our Northern shores.

Purple climber crabs
Metopograpsus
sp.

Orange signaller crab
Metaplax elegans

Ruby reef crab
Liomera
sp.

Pilodius rock crab
Pilodius sp.
2-4cm. Body squarish, purplish with spot, legs flat with pointed tips, pincers stout and purplish. Rocky shores. Commonly seen on our rocky shores. 2-2.5cm. Body squarish, legs flat with pointed tips. Dark bars on body and legs, eyes greenish and spaced apart. Sometimes seen in mangrove trees. 2cm. Body squarish, legs flat with pointed tips. Males with long orange pincers of equal size. Soft mud in the back mangroves. 1-2cm. Body and claws bright red with bumps and ridges. Coral rubble. Seen once on Labrador. 1 cm. Pincers with spoon-shaped tips, body flat. Commonly seen under stones near reefs.

Face-banded
Acropora crab

Tetralia nigrolineata

Red coral crab
Trapezia cymodoce

Hairy coral crab
Cymo andreossyi
   
1cm. Found only in Acropora corals (Acropora sp.). Brown with dark band across the eyes. Sometimes seen on our Southern shores. 1cm. Found only in Cauliflower corals (Pocillopora sp.). Red or orange. Sometimes seen on our Southern shores. 1 cm. Hairy body, legs and pincers. Found only in Acropora and Pocillopora hard corals. Sometimes seen on some of our Southern shores.    
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photo index of
crustaceans on this site
Crustaceans
all crustaceans

Crabs
all crabs and crab-like

small
body width <2 cm

small with long eyestalks


small porcelain crabs

3 pairs walking legs

medium
body width 3-5cm

large
body width >5cm

swimming crabs
last pair of legs paddle-shaped

hermit crabs
live in shells
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