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Female crab Xantho poressa at spawning time in the Black Sea, carrying eggs under her abdomen A Grapsus tenuicrustatus climbing up a rock in Hawaii. Each species has a particular number of zoeal stages, separated by moults, before they change into a megalopa stage, which resembles an adult crab, except for having the abdomen (tail) sticking out ...
Crabs are members of infraorder Brachyura. They are crustaceans with five pairs of legs, the first pair modified to form a pair of pincers, a flattish shell, and a short, broad abdomen folded under its thorax.
Ovalipes ocellatus, known as the lady crab, is a species of crab from eastern North America. [1] Other names for it include the leopard crab or Atlantic leopard crab due to the leopard-like rosette patterns on its shell, the calico crab (not to be confused with Hepatus epheliticus ), or ocellated crab . [ 3 ]
Female crabs are generally smaller than males [2] [5] and molt in the winter. [6] Egg production and reproduction require a lot of energy which is why females tend to be smaller than males. [ 8 ] [ 6 ] Differences in carapace width and claw size can be used to determine males from females.
A female's abdomen changes as it matures: an immature female has a triangular-shaped abdomen, whereas a mature female's is rounded. [8] Other species of Callinectes may be easily confused with C. sapidus because of overlapping ranges and similar morphology. One species is the lesser blue crab . It is found further offshore than the common blue ...
Portunidae is a family of crabs which contains the swimming crabs. Its members include many well-known shoreline crabs, such as the blue crab ( Callinectes sapidus ) and velvet crab ( Necora puber ). Two genera in the family are contrastingly named Scylla and Charybdis ; the former contains the economically important species black crab ( Scylla ...
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Geosesarma hagen is a species of small land-living crabs only found in Java, Indonesia. The crabs prefer a humid environment with elements from both terrestrial and freshwater aquatic habitats. They steer clear of drier land and although the younger crabs tend to live in closer proximity to the water, they are not aquatic crabs.