sea slaters text index | photo index
Phylum Arthropoda > Subphylum Crustacea > Class Malacostraca > Order Isopoda
Sea slaters
Ligia sp.
Family Ligiidae
updated Oct 10
if you learn only 3 things about them ...
They are NOT insects! They are more like crabs.
They have seven pairs of legs and move very quickly.
They are scavengers.

Where seen? These nervous little animals are commonly seen on almost all our shores, often swarming in large numbers at low tide. They are common on rocky shores, also among mangroves.

What are sea slaters? Sea slaters are sometimes called sea cockroaches. Although sea slaters are also arthropods, they are not insects! They are crustaceans like crabs and prawns; but are very happy out of water.

Features:
2-7cm. Sea slaters have seven pairs of legs and move very fast! They have huge eyes and very long antennae. They are well adapted for life out of water, breathing air directly through 'pseudo-lungs'. In fact, they will drown if kept under water!

What do they eat? Sea slaters are scavengers, nibbling on whatever recently died on the rocky shore. At low tide, they swarm over the rocks and shore looking for the recent dead.

On a mangrove tree trunk, a slater party?
Kranji, Jun 06


...with hanky panky going on?
Slater babies: Like many other crustacea, sea slaters can only mate just after the female moults. They brood their young in special pouches. The young are released as miniature adults instead of free-swimming larvae.

Empty skin left behind after a moult?
Sisters Island, Jul 06

Body very flat.
Labrador, May 09

Sea slaters on Singapore shores

Sentosa, Oct 04


Chek Jawa, Jan 05


East Coast, Aug 09

Feeding on recently destroyed barnacles?

more photos of sea slaters on Singapore shores
northern shores | southern shores


Links References
  • Edward E. Ruppert, Richard S. Fox, Robert D. Barnes. 2004.Invertebrate Zoology Brooks/Cole of Thomson Learning Inc., 7th Edition. pp. 963.
  • 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.
  • Jones Diana S. and Gary J. Morgan, 2002. A Field Guide to Crustaceans of Australian Waters. Reed New Holland. 224 pp.
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