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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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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]
True frogs is the common name for the frog family Ranidae.They have the widest distribution of any frog family. They are abundant throughout most of the world, occurring on all continents except Antarctica.
It differs from other genera in the family Raninidae by the lack of ornamentation of the male first pleopods and by the reduced number of gills (7 pairs rather than 8 pairs), and is therefore placed in a separate subfamily, Symethinae. [1] There are three extant species: [2] Symethis corallica Davie, 1989 – Chesterfield Reefs, Coral Sea [3]