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Ovalipes ocellatus is commonly known as the lady crab, [a] oscellated crab, [b] or calico crab. [6] It was first described in 1799 by naturalist Johann Friedrich Wilhelm Herbst, who placed it into the genus Cancer. [1] [2] In 1898, carcinologist Mary Jane Rathbun moved the species to her new genus Ovalipes. [11]
Portunus armatus is a species of crustacean, a swimming crab in the family Portunidae found in Australia and eastwards to New Caledonia. [1] Common names include blue swimmer crabs, Blue manna, Blueys, [2] and Jennies (for females). [3]
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, ...
Raninidae is a family of unusual crabs, sometimes known as "frog crabs", on account of their frog-like appearance. They are taken by most scientists to be quite primitive among the true crabs. They closely resemble the (unrelated) mole crabs, due to parallel evolution or convergent evolution. In both groups, the claws are modified into tools ...
The fiddler crab or calling crab can be one of the hundred species of semiterrestrial marine crabs in the family Ocypodidae. [2] These crabs are well known for their extreme sexual dimorphism, where the male crabs have a major claw significantly larger than their minor claw, whilst females claws are both the same size. [ 3 ]
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Seasonal variation of water temperature and sunlight duration are considered as the most important variables determining the breeding period of arrow crabs. [16] There is a positive relationship between fecundity and the size of the parental female. [7] In fact, the size of the female is the key variable in determining the number of eggs per batch.