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Conodonts are an extinct group of agnathan (jawless) vertebrates resembling eels, classified in the class Conodonta. For many years, they were known only from their tooth-like oral elements found in isolation and now called conodont elements. Knowledge about soft tissues remains limited. They existed in the world's oceans for over 300 million years, from the Cambrian to the beginning of the Jurassic. Conodont elements are widely used as index fossils, fossils used to define and identify geological periods. The animals are also called Conodontophora to avoid ambiguity.
Prioniodontida, also known as the "complex conodonts", is a large clade of conodonts that includes two major evolutionary grades; the Prioniodinina and the Ozarkodinina. It includes many of the more famous conodonts, such as the giant ordovician Promissum (Prioniodinina) from the Soom Shale and the Carboniferous specimens from the Granton Shrimp bed (Ozarkodinina). They are euconodonts, in that their elements are composed of two layers; the crown and the basal body, and are assumed to be a clade.
Ellisoniidae is an extinct family of conodonts, a kind of primitive chordate.
Hadrodontina is an extinct genus of conodonts in the family Ellisoniidae.
Bactrognathidae is an extinct family of conodonts in the order Prioniodinida.
Bactrognathus is an extinct genus of conodonts in the family Bactrognathidae.
Maurice Goldsmith Mehl was an American paleontologist. A longtime professor in the Department of Geology at the University of Missouri, Mehl was a founding member and officer of the American Association of Petroleum Geologists. Mehl was a fellow of the Geological Society of America (1922), the Paleontological Society, and the American Association for the Advancement of Science (1915).
Doliognathus is an extinct genus of conodonts in the family Bactrognathidae from the Middle Dinantian. It is a genus of multielement conodonts.
Staurognathus is an extinct genus of conodonts in the family Bactrognathidae from the Middle Dinantian. It is a genus of multielement conodonts.
Edward B. Branson was an American geologist and paleontologist. He worked at the University of Missouri.
Wurmiella is an extinct conodont genus.
Ozarkodinida is an extinct conodont order. It is part of the clade Prioniodontida, also known as the "complex conodonts".
Palmatolepidae is an extinct conodont family. It is part of the clade Prioniodontida, also known as the "complex conodonts".
Ozarkodina is an extinct genus of conodonts in the family Spathognathodontidae.
Palmatolepis is an extinct conodont genus in the family Palmatolepidae. It was the most abundant genus of conodonts of the Late Devonian, disappearing during the Devonian/Carboniferous crisis.
Idiognathodus is an extinct conodont genus in the family Idiognathodontidae.
Icriodus is an extinct conodont genus in the family Gnathodontidae.
Distomodus is an extinct genus of conodonts.
Prioniodus is an extinct genus of conodonts in the family Balognathidae from the Ordovician.
Prioniodinidae is an extinct family of conodonts in the order Prioniodinida.
References
- Sweet, W. C; P. C.J Donoghue (2001). "Conodonts: past, present, future". Journal of Paleontology 75 (6): 1174.
