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The Cretaceous crab revolution was a major diversification event of brachyuran crabs (also known as true crabs) that took place during the Cretaceous Period, from 145 to 66 million years ago. [ 1 ] [ 2 ] Nearly 80% of modern groups of crabs originated during this event. [ 3 ]
Some crab-shaped species have evolved away from the crab form in a process called decarcinisation. Decarcinisation, or the loss of the crab-like body, has occurred multiple times in both Brachyura and Anomura. [25] [26] However, there are varying degrees of carcinisation and decarcinisation. Thus, not all species can necessarily be distinctly ...
Avitelmessus grapsoideus is an extinct species of crab from the Late Cretaceous Peedee Formation and Ripley Formation of the United States. [2] The type species is A. grapsoideus . [ 3 ]
Necrocarcinidae is an extinct family of Late Jurassic and Cretaceous crabs. [1] It comprises 40 species grouped in seven genera. [2] [3] [4] Genera.
Callichimaera perplexa is a species of small crabs known from the Cretaceous Churuvita Group of Colombia and the Frontier Formation of the United States. [2] Because it possesses a strange combination of anatomical features, it is said to be the "platypus of crabs". [3]
The Cretaceous (IPA: / k r ɪ ˈ t eɪ ʃ ə s / krih-TAY-shəss) [2] is a geological period that lasted from about 143.1 to 66 million years ago (Mya). It is the third and final period of the Mesozoic Era, as well as the longest. At around 77 million years, it is the ninth and longest geological period of the entire Phanerozoic.
Corazzatocarcinus is an extinct genus of Cretaceous crabs. [1] [2] ... Corazzatocarcinus is known in Cretaceous of Lebanon (from about 99.7 to 94.3 million years ago ...
Crabs radiated in the Late Jurassic, corresponding with an increase in reef habitats, though they would decline at the end of the Jurassic as the result of the decline of reef ecosystems. Crabs increased in diversity through the Cretaceous and represented the dominant group of decapods by the end of the period. [42]