crustacea text index | photo index
Phylum Arthropoda > Subphylum Crustacea > Class Malacostraca > Order Decapoda
Photo index of crabs on Singapore shores
Medium sized crabs: body width 3-5cm

size indicated is for body width

Velcro crab
Camposcia retusa

Sea toad spider crab
Schizophrys
sp.

Sponge crab
Family Dorippidae

Common hairy crab
Pilumnus
sp.

Lumpy rock crab
Euxanthus exsculptus
3-6cm. Body tear-drop shaped with a pointed end between the eyes. Covers itself with living sponges, animals and seaweeds. Coral rubble, seagrass areas. Commonly seen on our Northern shores.
4-5cm. Body teardrop-shaped with large spines on the sides. Pincers long and cylindrical. Coral rubble, large boulders, reefs. Sometimes seen on some of our shores.
0.5-5cm. Body spherical and smooth, two pairs of short legs bent over its back to hold on to the sponge or ascidian. Coral rubble, seagrass areas. Sometimes seen on our Northern shores.
3-5cm. Body and legs covered in long silky hairs. Strong claws, some black-tipped. Coral rubble Very commonly seen on many of our shores. 3-5cm. Body rectangular, short pincers densely covered with smooth lumps and bumps. Coral rubble area. Sometimes seen on some of our shores.

Moon crab
Matuta lunaris

Flower moon crab
Matuta planipes

Paddler crab
Varuna
sp.

Domed elbow crab
Cryptopodia fornicata

Reef box crabs
Calappa hepatica
2-8cm. Body with a pair of long spines on the sides. Squarish claws. All legs modified into paddles. Sandy silty shores, especially near seagrasses. Commonly seen on our Northern shores. Body width 2-8cm. Body with a pair of long spines on the sides. Squarish claws. All legs modified into paddles. Colourful legs and maroon circles on the body. Sandy areas near seagrasses. Seasonally, commonly seen on Changi. 3-5cm. Squarish body. Last two pairs of legs modified into paddles. Sometimes seen near mangroves and freshwater streams. About 6cm. Body domed, spindly walking legs, tiny eyes close together at the top of a rather triangular head. Pincers large and angular. Seen once on Changi. About 4 cm. Pincers flat, held against the face to form a boxy-shape. Sandy shore near reefs. Seen once at Pulau Hantu.

Ferocious reef crab
Eriphia ferox

Fuzzy reef crab
Pilumnus sluiteri
 

Sally-light-foot crab
Grapsus albolineatus

Rafting crab
Plagusia sp.
5-7cm. Body reddish with large rounded pincers and bright red eyes. Rocky shores. Commonly seen at night on our Southern shores. 3-5cm. Body sparsely fuzzy with bright red eyes. Good reefs. Sometimes seen on our Southern shores.   5-6cm. Body circular, flat, smooth. Long flattened legs, small pincers. Rocky shores. Commonly seen at night on some of our shores. 5-6cm. Body oblong, not so flat, pimply. Long flattened legs, small pincers. Rocky shores. Sometimes seen on our Northern shores.

Face-band
sesarmine crab

Perisesarma sp.

Mound crab
Sarmatium germaini

Tree-climbing crab
Episesarma
sp.

Mangrove
tree-dwelling crab

Selatium brockii
 
2-3cm. Body flat and squarish, legs flat with pointed tips. Pincers deep red. Irridescent blue or green band across the face. Sometimes seen in our mangroves. 3-8cm. Body round, legs flat with pointed tips, pincers fat. Seldom seen in our mangroves. 4-5cm. Body flat and squarish, legs flat with pointed tips. Pincers may be colourful. Sometimes seen in our mangroves, digging into mudlobster mounds or climbing up trees. 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.  



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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