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Crab (Pachygrapsus marmoratus) on Istrian coast, Adriatic Sea. ... The vast number of brachyuran crabs have internal fertilisation and mate belly-to-belly. For many ...
The Cretaceous crab revolution was a major diversification event of brachyuran crustaceans (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 ]
Carcinisation (American English: carcinization) is a form of convergent evolution in which non-crab crustaceans evolve a crab-like body plan. The term was introduced into evolutionary biology by L. A. Borradaile, who described it as "the many attempts of Nature to evolve a crab". [2]
Following fertilization, female crabs carry eggs on their abdomen during their early stages of development. [1] When they hatch, the eggs are released into the water where they will undergo five stages of juvenile development, four zoeal stages and 1 megalopa stage. [6] During all zoeal stages, the larvae live in brackish waters. [6]
Mictyris brevidactylus is a species of crab found in Japan, China (including the type location, Hong Kong), Taiwan, Singapore, and parts of Indonesia (Karakelong, Bawean and Ambon Island). [2] The adults have a light-blue carapace and scarlet-jointed legs , while juveniles are yellowish-brown.
Since its ancestors were long-tailed decapods, and its successors were short-tailed crabs, Eocarcinus has been described as "the lobster who decided to become a crab". [5] Previously considered to be the oldest known true crab , a 2010 revision concluded that Eocarcinus could not be accommodated among the Brachyura, and was instead transferred ...
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Anomura (sometimes Anomala) is a group of decapod crustaceans, including hermit crabs and others. Although the names of many anomurans include the word crab, all true crabs are in the sister group to the Anomura, the Brachyura (the two groups together form the clade Meiura).