Taxonomy Name  Charybdis natator (MALE)
Order  Decapoda
Family
 Portunidae
Local Name  Ketam laut
Synonym  
Common Name  Ridged swimming crab
DOF Valid Name  Ketam Jalur
Author  (Herbst, 1794)
Locality Terengganu
Description Distinctive ridges on the dorsal side. The color of the upper surface (dorsal view) of the carapace brown to orangish while the bottom of underside (ventral side) bluish, mottled with white and pale red. Legs are dark reddish brown in color. Absent of distinct transverse ridges in the anterior side. Posterior border of the carapace curve with brown and white band. The carapace is densely covered with short soft hairs; downy.