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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.
Promissum is an extinct genus of conodonts, primitive chordates, that lived during the Upper Ordovician period.
The Whiterockian, often referred to simply as the Whiterock, is an earliest or lowermost stage of the Middle Ordovician. Although the Whiterockian or Whiterock Stage refers mainly to the early Middle Ordovician in North America, it is often used in the older literature in a global sense.
Periodon is a genus of conodonts which existed in what is now Canada, Iran, Argentina, China, Russia, and the United States during the Ordovician Period. It was described by Hadding in 1913, and the type species is P. aculeatus.
Iapetognathus is a genus of cordylodan conodonts. It is one of the oldest denticulate euconodont genera known.
Curtognathus is an extinct genus of conodonts from the Ordovician in the family Distacodontidae.
Erraticodon is an extinct genus of conodonts in the family Chirognathidae.
Notiodella is an extinct conodont genus in the family Balognathidae. It has been described from a 17-element apparatus from the Soom Shale Lagerstätte in South Africa.
Paracordylodus is an extinct genus of conodonts in the clade Prioniodontida, also known as the "complex conodonts". The species P. gracilis has been recovered from the chert of the Narooma Terrane, a geological structural region on the south coast of New South Wales, Australia.
Rossodus is an extinct genus of conodonts in the clade Prioniodontida, the "complex conodonts", of the Early Ordovician.
Amorphognathus is an extinct conodont genus in the family Balognathidae from the Ordovician.
Appalachignathus is a genus of multielement conodonts from the Middle Ordovician of North America.
William Madison Furnish was an American paleontologist. He taught at the University of Iowa.
Prioniodus is an extinct genus of conodonts in the family Balognathidae from the Ordovician.
Acanthodus is an extinct genus of conodonts.
Utahconus is an extinct genus of conodonts.
Microzarkodina is an extinct genus of conodonts mainly from the Middle Ordovician of Baltoscandia. The Microzarkodina apparatus probably consisted of 15 or 17 elements: four P, two or four M and nine S elements. The S elements include different Sa, Sb1, Sb2, and Sc element types.
Histiodella is an extinct genus of conodonts.
Protoprioniodus is an extinct genus of conodonts.
Misikella is an extinct genus of conodonts.
References
- ↑ Lower Viruan (Middle Ordovician) conodonts from the Gullhögen quarry, southern central Sweden. LE Fåhræus, 1966, Sveriges geologiska undersökning
- ↑ A septimembrate apparatus model for the Ordovician conodont genus Cornuodus Fahraeus, 1966. Anita M. Lofgren, Bollettino della Societa Paleontologica Italiana, 37(2), pages 175-186, January 1998
