Polymorphy and extinction of the Late Cretaceous burrowing shrimp Protocallianassa faujasi and first record of the genera Corallianassa and Calliax (Crustacea, Decapoda, Thalassinoidca) from the Cretaceous

@article{Swen2001PolymorphyAE,
  title={Polymorphy and extinction of the Late Cretaceous burrowing shrimp Protocallianassa faujasi and first record of the genera Corallianassa and Calliax (Crustacea, Decapoda, Thalassinoidca) from the Cretaceous},
  author={Krista Swen and Ren{\'e} H. B. Fraaije and Gijsbert J. van der Zwaan},
  journal={Contributions to Zoology},
  year={2001},
  volume={70},
  pages={85-98}
}
A biometric study of chelae of the burrowing shrimp Protocallianassa faujasi (Desmarest, 1822), from the late Maastrichtian of the Maastrichtian type area, The Netherlands, has revealed three morphotypes. These types are interpreted as sexual dimorphs (male and female) and earliest ecdysis stages (immature male). Among the studied material are fifteen specimens of a new Cretaceous callianassid, Corallianassa acucurvata new species, one specimen provisionally assigned to the genus Calliax and a… 

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