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Conodonts are an extinct group of agnathan (jawless) Fish 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 worlds 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.
Prioniodinida is an extinct order of conodonts, a kind of primitive chordate.
Ellisoniidae is an extinct family of conodonts, a kind of primitive chordate.
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.
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.
Spathognathodontidae is an extinct conodont family ranging from the Silurian to the Devonian.
Anchignathodontidae is an extinct conodont family.
Kockelellidae is an extinct conodont family.
Idiognathodontidae is an extinct conodont family.
Elictognathidae is an extinct conodont family.
Chirognathidae is an extinct family of conodonts.
Spathognathodus is an extinct conodont genus in the family Spathognathodontidae. It is a non-Platform conodont, from the Pennsylvanian (Carboniferous).
Balognathidae is an extinct conodont family.
Scaliognathus is an extinct genus of conodonts.
Dollymae is an extinct genus of conodonts.
References
- ↑ Phylogeny of the Multielement Conodont Genera Bactrognathus, Doliognathus and Staurognathus. Karl M. Chauff, Journal of Paleontology, Vol. 59, No. 2 (Mar., 1985), pages 299-309 (Stable URL, retrieved 22 April 2016)
