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In the Anomura (hermit crabs and related animals), the fifth pair of pereiopods is often hidden inside the branchial chamber, where they are used to clean the gills. The cephalothorax is covered by a carapace which protects the internal organs and the gills; the section of the carapace that projects in front of the eyes is called the rostrum .
Archosargus probatocephalus is an omnivore, the larger juveniles and adults are predators of blue crab (Callinectes sapidus), oysters, clams, crustaceans, and small fish with the young Atlantic croakers (Micropogonias undulatus) The large flattened teeth are used to crush prey protected by shells or armor as well as to scrape barnacles off ...
Callinectes sapidus – blue crab; Callinectes similis; Cancer bellianus; Cancer borealis – Jonah crab; Cancer irroratus – Atlantic rock crab; Cancer pagurus – edible crab; Carcinus maenas – European shore crab; Cardisoma guanhumi – blue land crab; Carpoporus papulosus; Celatopesia concava; Chaceon fenneri – golden crab ...
The blue line hermit crab shows a sign of remarkable intelligence. These organisms will traditionally engage in unique behaviors before mating. Some such examples include the male rotating the female’s shell or rubbing their chilipeds, or claws, around the opening of the female’s shell.
Callinectes similis is a good swimmer, and its last pereiopods are expanded to paddles with which it swims. Adult males may grow up to a width of 122 millimetres (4.8 in), while females may reach 95 mm (3.7 in).
These tiny blue crabs were revealed in a handful of sand
Blue crab escaping from the net along the Core Banks of North Carolina.. Callinectes sapidus (from the Ancient Greek κάλλος,"beautiful" + nectes, "swimmer", and Latin sapidus, "savory"), the blue crab, Atlantic blue crab, or, regionally, the Maryland blue crab, is a species of crab native to the waters of the western Atlantic Ocean and the Gulf of Mexico, and introduced internationally.
They share a very similar overall shape with the Atlantic Blue Crab. [6] The carapace of a Speckled swimming crab is light brown, light maroon, or olive with many white or tan irregular round spots. [6] The males tend to be more colorful. [6] The carapace can reach lengths between 4.5 and 6 inches wide (~120-150mm). [6]