''Portunus'' is a genus of

crab Crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting "tail" (abdomen) ( el, βραχύς , translit=brachys = short, / = tail), usually hidden entirely under the thorax. They live in all th ...

which includes several important species for

fisheries Fishery can mean either the enterprise of raising or harvesting fish and other aquatic life; or more commonly, the site where such enterprise takes place ( a.k.a. fishing ground). Commercial fisheries include wild fisheries and fish farms, ...

, such as the blue swimming crab, ''

Portunus pelagicus ''Portunus pelagicus'', also known as the flower crab, blue crab, blue swimmer crab, blue manna crab or sand crab, ''rajungan'' in Indonesian, and ''alimasag'' in Tagalog, Kapampangan, and Pangasinan, is a large crab found in the intertidal estua ...

'' and the Gazami crab, '' P. trituberculatus''. Other species, such as the three-spotted crab ('' P. sanguinolentus'') are caught as

bycatch Bycatch (or by-catch), in the fishing industry, is a fish or other marine species that is caught unintentionally while fishing for specific species or sizes of wildlife. Bycatch is either the wrong species, the wrong sex, or is undersized or juve ...

The genus ''Portunus'' contains more than 90 extant species and over 40 further species known only from fossils. Fossils of crabs within this genus can be found in sediment of Europe, the United States, Mexico, Venezuela, Brazil and Australia from

Paleogene The Paleogene ( ; also spelled Palaeogene or Palæogene; informally Lower Tertiary or Early Tertiary) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period million years ago ( Mya) to the beginning o ...

to recent (age range: 48.6 to 0.0 million years ago).Fossilworks
/ref> The extant species are as follows:

References

{{Taxonbar, from=Q3399586 Portunoidea Paleogene genus first appearances Extant Paleogene first appearances Decapod genera