English Name: Charybdis (Charybdis) natator
Common Name: Giant Swimming Crab
The Giant Swimming Crab, scientifically known as *Charybdis (Charybdis) natator*, is a fascinating species of crab belonging to the family Portunidae. It is widely distributed across various regions in the Indo-Pacific, including China (particularly Guangxi, Guangdong, Fujian, and Taiwan), Japan, Indonesia, the Philippines, Malaysia, Thailand, India, Madagascar, and parts of East Africa. These crabs typically inhabit sandy or muddy seabeds, where they can burrow and remain hidden from predators.
This species is characterized by its robust body and distinctive physical features. The carapace (head and thorax) is elevated and densely covered with fine hairs. The surface of the head thorax near the base of the front teeth is particularly notable. Along the back of the cephalothorax, there are granular ridges of varying lengths, adding to its unique appearance. The front teeth consist of six in total, with the central four being similar in size. The leading edge has a blunt tip on the first tooth, while the second to fourth teeth are sharp and pointed. The last tooth is slightly indented. Both the trailing and posterior edges feature granular ridges, contributing to the crab’s textured look.
The chelipeds (claws) are strong and unequal in size. The surfaces of the wrist and palm segments have flattened particles, while the back of the palm segment is adorned with five spines. The inner and outer sides of the palm are lined with column-like particles, giving it a structured and intricate design.
In terms of coloration, the head and thorax are generally brown with red mottling, and the cheeks are often bright red, making this crab visually striking. Males tend to be larger than females, with a head thorax length of up to 69.0 millimeters and a width of 103.0 millimeters, showcasing their impressive size and strength.
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