Open AccessThe Ostracod Genus Dicrorygma POAG 1962 from Upper Jurassic and Lower Cretaceous
Author(s) -
Ole Bruun Christensen
Publication year - 1965
Publication title -
danmarks geologiske undersøgelse. 2. række
Language(s) - English
Resource type - Journals
eISSN - 2597-291X
pISSN - 0366-9130
DOI - 10.34194/raekke2.v90.6881
Subject(s) - ostracod , cretaceous , subgenus , genus , paleontology , geology , brackish water , biology , ecology , oceanography , salinity
Representatives of the subgenus Dicrorygma Poag are found in Lower Cretaceous beds in Texas, England, and Denmark.Two new Lower Cretaceous species have been described from England and Denmark, respectively. Besides, an ostracod closely related to the English species has been described from Danish beds.Species of Dicrorygma (Orthorygma) nov. subgen. occur in beds of the Kimmeridgian, Portlandian, and Purbeckian Ages from Denmark. Frequent occurrences of the species in the Purbeckian beds indicate marine ingressions in these otherwise brackish deposits. A number of formerly described Upper Jurassic species from NW. Europe are considered to belong to the genus Dicrorygma. Three new Upper Jurassic species are described.