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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 .
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.
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It may grow up to 15.0 centimetres (5.9 in) long, and may weigh up to 900 grams (2.0 lb). [7] The carapace is wider at the front, reddish brown in color, with ten white spots. [5]
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]
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
In "A classification of living and fossil genera of decapod crustaceans" De Grave and colleagues divided Majoidea into six families. [1]The classification has since been revised, with subfamilies Epialtinae and Mithracinae being elevated to families and Hymenosomatidae being moved to its own superfamily.