Protastacus
''Protastacus'' is an extinct genus of Decapoda, decapod crustaceans that lived in what is now Germany during the early Cretaceous period. The type species is ''P. politus'', and a second species, ''P. antiquus'', is also assigned to the genus. ''Protastacus'' grew to around long and had a mostly crayfish-like appearance, with enlarged Pincer (biology), pincer-bearing appendages and a segmented abdomen. Though formerly assigned to the Astacidae or Nephropoidea, it is currently placed as the only genus in the Family (biology), family Protastacidae, which in turn is the only family in the Superfamily (taxonomy), superfamily Protastacoidea. Both known species are believed to be brackish water animals, inhabiting a large upland-surrounded lake where the Bückeberg Formation was deposited during the earliest Cretaceous. This lake was originally freshwater and connected to the Boreal Sea, but became brackish due to marine transgression. ''Protastacus'' would have lived alongside variou ...
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Protastacus Antiquus Lateral
''Protastacus'' is an extinct genus of Decapoda, decapod crustaceans that lived in what is now Germany during the early Cretaceous period. The type species is ''P. politus'', and a second species, ''P. antiquus'', is also assigned to the genus. ''Protastacus'' grew to around long and had a mostly crayfish-like appearance, with enlarged Pincer (biology), pincer-bearing appendages and a segmented abdomen. Though formerly assigned to the Astacidae or Nephropoidea, it is currently placed as the only genus in the Family (biology), family Protastacidae, which in turn is the only family in the Superfamily (taxonomy), superfamily Protastacoidea. Both known species are believed to be brackish water animals, inhabiting a large upland-surrounded lake where the Bückeberg Formation was deposited during the earliest Cretaceous. This lake was originally freshwater and connected to the Boreal Sea, but became brackish due to marine transgression. ''Protastacus'' would have lived alongside variou ...
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