porcelain crabs text index | photo index
Phylum Arthropoda > Subphylum Crustacea > Class Malacostraca > Order Decapoda > Anomurans > Family Porcellanidae
Big porcelain crab
Petrolisthes sp.*
Family Porcellanidae
updated Dec 2019
Where seen? This flat crab with large flat pincers is often seen on some of our rocky shores, hidden under stones. After having a look under a stone, be sure to replace the stone the way you found it. Do it carefully so you don't crush any living things.

Features: It's larger and more colourful than most porcelain crabs found under stones. Body width 1-2cm. Body somewhat oval, not hairy. The pincers are much bigger than the body and have serrated edges. Antennae much longer than the body.
The crab is reddish or maroon with a pattern of fine stripes. It may have spots of bright colour (orange, blue) near the tips of the pincers and around the face.

Lazarus Island, Aug 12

Feathery mouthparts.

Lazarus Island, Aug 12

Feathery mouthparts.

Three pairs of walking legs.
Changi, Jun 08

Fourth pair of legs reduced and
tucked up next to the body.

*Species are difficult to positively identify without close examination.
On this website, they are grouped by external features for convenience of display.

Big porcelain crabs on Singapore shores
On wildsingapore flickr

Other sightings on Singapore shores

East Coast Park, Jun 11
Photo shared by Loh Kok Sheng on his blog.

East Coast Park, Feb 16
Photo shared by Loh Kok Sheng on flickr.

Labrador, Aug 17
Photo shared by Loh Kok Sheng on facebook.

Berlayar Creek, Dec 10
Photo shared by Loh Kok Sheng on his blog.

St Johns Island, Sep 07
Photo shared by Loh Koh Sheng on flickr.

Kusu Island, Jun 21
Photo shared by Vincent Choo on facebook.

Sisters Island, Jan 10
Photo shared by Loh Koh Sheng on his flickr.

Terumbu Selegie, Jun 11
Photo shared by Russel Low on facebook.

Genus Petrolisthes recorded for Singapore
from Wee Y.C. and Peter K. L. Ng. 1994. A First Look at Biodiversity in Singapore.
*name updates from BiotaTaiwanica
+from our observation
in red are those listed among the threatened animals of Singapore from Ng, P. K. L. & Y. C. Wee, 1994. The Singapore Red Data Book: Threatened Plants and Animals of Singapore.

  Petrolisthes hastatus
Petrolisthes kranjiensis
Petrolisthes lamarckii
Petrolisthes miliatris
Petrolisthes teres

Links References
  • Lim, S., P. Ng, L. Tan, & W. Y. Chin, 1994. Rhythm of the Sea: The Life and Times of Labrador Beach. Division of Biology, School of Science, Nanyang Technological University & Department of Zoology, the National University of Singapore. 160 pp.
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