Charybdis (Charybdis) orientalis

Charybdis (Charybdis) orientalis, commonly referred to as the Oriental swimming crab, is a species of crab belonging to the family Portunidae. It is a relatively common and widespread species found in various marine environments.

Description & Characteristics

Charybdis (Charybdis) orientalis is characterized by its flattened carapace, which can reach a maximum size of about 10 centimeters in width. The carapace is typically brown or greenish-brown in color and covered in small bumps and granules. The crab possesses five pairs of legs, with the last pair modified into flattened, paddle-like appendages used for swimming. These specialized swimming legs give the crab its characteristic ability to move quickly through the water.

Habitat and Occurrence

Charybdis (Charybdis) orientalis is a highly adaptable species and can be found in a variety of marine environments. It is most commonly found in the Indo-Pacific region, ranging from the east coast of Africa to the western coast of the Americas. Its habitat preference includes shallow, coastal waters, including estuaries, mangrove forests, and coral reefs. This crab is typically found at depths ranging from the intertidal zone to around 50 meters, inhabiting both the neritic and oceanic marine zones.

Taxonomy

Charybdis (Charybdis) orientalis is classified within the Class Malacostraca, Order Decapoda, and Family Portunidae. This family, known as the swimming crabs, encompasses numerous species of crabs characterized by their flattened carapaces and specialized swimming legs. The species Charybdis (Charybdis) orientalis is further categorized into the genus Charybdis, which contains a diverse array of swimming crabs.

Feeding

Charybdis (Charybdis) orientalis is an opportunistic omnivore. It feeds on a variety of food sources, including mollusks, crustaceans, fish, algae, and detritus. Its feeding habits are primarily driven by availability and opportunity. The crab’s strong claws allow it to efficiently break open shells and access the soft tissues of its prey. This adaptability in diet allows it to thrive in various environments, contributing to its successful distribution.