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List Of Prehistoric Sea Cucumbers
This list of prehistoric sea cucumbers is an attempt to create a comprehensive listing of all genera from the fossil record that have ever been considered to be holothuroidea, excluding purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful (''nomina dubia''), or were not formally published ('' nomina nuda''), as well as junior synonyms of more established names, and genera that are no longer considered sea cucumbers. Naming conventions and terminology Naming conventions and terminology follow the International Code of Zoological Nomenclature(ICZN). Technical terms used include: * Junior synonym: A name which describes the same taxon as a previously published name. If two or more genera are formally designated and the type specimens are later assigned to the same genus, the first to be published (in chronological order) is the senior synonym, and all other instances are junior synonyms. Senior synonyms ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Arandaspis Prionotolepis
''Arandaspis prionotolepis'' is an extinct species of jawless fish that lived in the Ordovician period, about 480 to 470 million years ago. Its remains were found in the Stairway Sandstone near Alice Springs, Australia in 1959, but it was not determined that they were the oldest known vertebrates until the late 1960s. ''Arandaspis'' is named after a local Aboriginal tribe, the Aranda (now currently called Arrernte). Description ''Arandaspis'' was about long, with a streamlined body covered in rows of knobbly armoured scutes. The front of the body and the head were protected by hard plates with openings for the eyes, nostrils and gills. It probably was a filter-feeder. It had no fins; its only method of propulsion was the use of its vertically flattened tail. As a result, it probably swam in a fashion similar to a modern tadpole A tadpole is the larval stage in the biological life cycle of an amphibian. Most tadpoles are fully aquatic, though some species of amphi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Achistrum
''Achistrum'' is an extinct genus of sea cucumber which existed in Poland during the Triassic The Triassic ( ) is a geologic period and system which spans 50.6 million years from the end of the Permian Period 251.902 million years ago (Mya), to the beginning of the Jurassic Period 201.36 Mya. The Triassic is the first and shortest period ... period, and the United States during the Carboniferous period. Krystyna Zawidzka. It contains the species ''Achistrum nicholsoni'' and ''Achistrum ludwigi''. References Apodida Carboniferous echino ...[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calclamna
''Calclamna'' is an extinct genus of sea cucumber which existed in Europe during the Triassic and Jurassic The Jurassic ( ) is a Geological period, geologic period and System (stratigraphy), stratigraphic system that spanned from the end of the Triassic Period million years ago (Mya) to the beginning of the Cretaceous Period, approximately Mya. The J ... period. Krystyna Zawidzka. The type species is ''Calclamna germanica''. References Calclamnidae Triassic animals of Europe[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calcancora
''Calcancora'' is an extinct genus of sea cucumber which existed in Poland during the Triassic period, Germany during the upper Jurassic period, France, Brazil, and the United States during the Paleogene period, and Austria during the Tortonian The Tortonian is in the geologic time scale an age or stage of the late Miocene that spans the time between 11.608 ± 0.005 Ma and 7.246 ± 0.005 Ma (million years ago). It follows the Serravallian and is followed by the Messinian. The Tort ... period. Krystyna Zawidzka. The type species is ''Calcancora mississippiensis''. References Apodida[...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |