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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 .
Raninidae Raninoida is a taxonomic section of the crabs , containing a single superfamily , Raninoidea . This group of crabs is unlike most, with the abdomen not being folded under the thorax .
This species as an unusual carapace in that it is longer than it is wide. Males grow to about 5.2 cm (2.0 in) long and 1.3 cm (0.51 in) wide. Females grow to 3 cm (1.2 in) wide and about 4.9 cm (1.9 in) long.
Ranina is a genus of crabs belonging to the family Raninidae. It has two extant species. Fossils of these crabs have been found in the sediments of United States, Mexico, Spain, Italy, Turkey and Australia from the Paleogene period to Recent (age range: 48.6 to 0.0 Ma). [1]
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The species is commercially exploited over much of its range, but the largest fishery is in Australia, where the annual commercial catch an estimated at 3,592 tonnes (7,919,000 lb).
The three species classified under Notopus are set out below together with the geological frame for the two extinct species which are marked with †: [2]. Notopus beyrichi† Bittner, 1875 - middle Eocene-lower Oligocene
Notopus dorsipes is a species of frog crab from the family Raninidae which has an Indo-Pacific distribution and which has recently spread into the eastern Mediterranean. It is the only extant species in the genus Notopus .