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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 .
Ann Arbor is a city in and the county seat of Washtenaw County in the U.S. state of Michigan.Founded in 1824 by John Allen and Elisha Rumsey, it was named after the wives of the village's founders, both named Ann, and the stands of bur oak trees they found there.
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.
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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]
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.
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]
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