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Njoerdichthys
''Njoerdichthys'' is an extinct genus of pycnodontid fish from the Cretaceous Hesseltal Formation in Germany. Discovery and naming The original holotype of ''Njoerdichthys'' was discovered in 1995 at the abandoned Galgenknapp quarry, previously owned by the Dyckerhoff AG company, while the paratype specimens were discovered in the Hohne quarry, also owned by the company, located west of Lengerich, Germany. The specimens were found in laminated marlstones. Both quarries are part of the Late Cretaceous Hesseltal Formation. All of the specimens where collected and then prepared by Udo Resch, who is famous for his fossil preparating skills. The name of ''Njoerdichthys'' refers to the ancient Germanic god Njörd, who, in German mythology, navegates the waters and winds, plus the Greek name "ichthyos", meaning fish. The name of the species, ''N. dyckerhoffi'', refers to the Dyckerhoff AG company. Description ''Njoerdichthys'' was a small fish, the holotype being 4.2 cm lon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pycnodontidae
Pycnodontidae is an extinct family of ray-finned fishes, ranging from the Jurassic period until the Late Eocene. It was the largest and most derived family of the successful Mesozoic fish order Pycnodontiformes, and one of only two families (alongside the Serrasalmimidae) to survive into the Cenozoic. Genera The following genera are known: * Family Pycnodontidae Agassiz, 1835 ** ''Acrotemnus'' Agassiz, 1843 (=''Macropycnodon'' Shimada ''et al.'', 2010) ** ?''Agassizilia'' Cooper & Martill, 2020 ** ''Akromystax'' Poyato-Ariza & Wenz, 2005 ** ''Anomoeodus'' Forir, 1887 ** ''Apomesodon'' Poyato-Ariza & Wenz, 2002 ** ''Athrodon'' Sauvage, 1880 ** ''Brauccipycnodus'' Taverne & Capasso, 2021 ** ''Coelodus'' Heckel, 1854 ** ''Costapycnodus'' Taverne, Capasso & del Re, 2019 ** ''Gregoriopycnodus'' Taverne, Capasso & del Re, 2020 ** ''Haqelpycnodus'' Taverne & Capasso, 2018 ** ''Iemanja (fish), Iemanja'' Wenz, 1989 ** ''Libanopycnodus'' Taverne & Capasso, 2018 ** ''Macromesodon'' Blake, 19 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hesseltal Formation
The Hesseltal Formation or Blackcoloured Formation is a Late Cretaceous (late Cenomanian to early Turonian) geological formation from northern Germany. It consists of lithified marls and limestone, with a unique series of black shales deposited in anoxic event, anoxic conditions during the Cenomanian-Turonian boundary event. It provides an important record of the fauna of the proto-North Sea basin. The formation's diversity of fossil fish is thought to be due to a consequence of an expanding oxygen minimum zone that caused mass mortalities among different communities of fish, including both those associated with warm surface waters and those associated with colder waters from upwelling. The anoxic conditions allowed for detailed preservation of some of these fish, including bony fish with their stomach contents preserved and even a few partial body fossils of cartilaginous fish. Fossil Ammonoidea, ammonites with preserved soft parts are also known. The formation's deposition al ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
