Carpilius convexus, commonly known as the marbled stone crab, is a species of crab found in the Indo-Pacific, from Hawaii to the Red Sea and South Africa. It was first described by Peter Forsskål in 1775 as " Cancer convexus ", and has sometimes been treated as a variety of the larger species Carpilius maculatus.

Name: Carpilius convexus Common name: Red Reef Crab, Convex Reef Crab, (in Arabic: Saratan al-murjan) Local name: Scientific name:Carpilius convexus Classification: Class: malacostracans; order: crabs (Decapoda); family: reef crabs (Carpiliidae) Size: Specimens usually have a carapace width of 8 10 cm, reaching a maximum of 15 cm.