As shown in the picture , ? It could be? Dungeness crab?

Grapsidae, the genus Metopograpsus, is a decapod arthropod.

Below is a picture of a four-toothed frontal crab. Metopograpsus quadratocephalus Metopograpsus quadridentatus?

It is distributed in the waters of the Indian and Western Pacific Oceans, including China, Hong Kong, China, Malacca, Java, Kalimantan, Singapore, Malaysia, Indonesia, and Papua New Guinea.

Often live in the low tide line on rocky beaches, crawling rapidly. The gill cavity is often parasitic isopods. Prey on small intertidal invertebrates such as cape shells, but also eat dead animals and algae.