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Species Encyclopedia: Horn-eyed Sand Crab

Time:2023-02-03 11:05:53 author:Birds Read:651次
Species Encyclopedia: Horn-eyed Sand Crab

The horn-eyed sand crab, a genus of sand crabs of the order Decapodidae, is named for the elongated horn-like protrusions at the ends of its eyes. Commonly found on sandy beaches near the high tide line in the Indo-Pacific tropics. The carapace is nearly square, with a raised back. The edge of the dorsal eye socket is straight, the eye stalk is thick, and the end of the eye has a slender horn-like protrusion. This protrusion is basically found in adult males, while females and juveniles are short or absent. The two claws are asymmetric; the legs are slender, with four pairs in total, the fourth pair being shorter and smaller. They are typical gregarious animals, generally burrowing in deep holes on the beach. It usually appears on the beach at low tide in the evening. They are extremely agile. They usually use the second and third pairs of feet to crawl, and the speed can reach 1-1.6 m/s. They only use 4 pairs of feet when they stop or change direction. The larvae feed on plankton, and the adults like to climb in the sandy woods, tossing the branches and leaves, catching insects with their chelipeds, and also eating algae and carrion of small animals. The genus Sandcrab belongs to the subfamily Sandcrabidae, and there are about 18 species. They are widely distributed in the Indo-West Pacific and are the dominant crabs living in the intertidal and supratidal zones of warm seas. It is a clustered burrowing type, burrowing in deep holes on the beach. The holes are generally spiral, and the mouth of the hole forms a sand tower, which is unique to sand crabs. The shape of the carapace varies, most of which are square or horizontally rectangular, and some are spherical or square. Eyestalks are long, allowing you to see what's going on outside the hole.


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