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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, which are usually found in isolation and are 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.
Agnatha is an infraphylum of jawless fish in the phylum Chordata, subphylum Vertebrata, consisting of both present (cyclostomes) and extinct species. Among recent animals, cyclostomes are sister to all vertebrates with jaws, known as gnathostomes.
In the geological timescale, the Llandovery Epoch occurred at the beginning of the Silurian Period. The Llandoverian Epoch follows the massive Ordovician-Silurian extinction events, which led to a large decrease in biodiversity and an opening up of ecosystems.
Taphrognathus is an extinct genus of conodonts from the Dinantian.
Paleontology in Wisconsin refers to paleontological research occurring within or conducted by people from the U.S. state of Wisconsin. The state has fossils from the Precambrian, much of the Paleozoic, and the later part of the Cenozoic. Most of the Paleozoic rocks are marine in origin. Because of the thick blanket of Pleistocene glacial sediment that covers the rock strata in most of the state, Wisconsin’s fossil record is relatively sparse. In spite of this, certain Wisconsin paleontological occurrences provide exceptional insights concerning the history and diversity of life on Earth.
The Richmond Group is a geologic group in Michigan. It preserves fossils dating back to the Ordovician period.
Bactrognathus is an extinct genus of conodonts in the family Bactrognathidae.
Maurice Goldsmith Mehl was an American paleontologist and professor in the Department of Geology at the University of Missouri.
Edward B. Branson was an American geologist and paleontologist. He was a professor of geology at the University of Missouri.
Wurmiella is an extinct conodont genus.
Ozarkodina is an extinct genus of conodonts in the family Spathognathodontidae.
Carniodus is a conodont genus from the Silurian.
Pterospathodontidae is an extinct conodont family in the order Ozarkodinida.
Ctenognathodus is an extinct conodont genus in the family Kockelellidae.
Spathognathodus is an extinct conodont genus in the family Spathognathodontidae. It is a non-Platform conodont, from the Pennsylvanian (Carboniferous).
Icriodus is an extinct conodont genus in the family Gnathodontidae.
Anticostiodus is an extinct genus of multielement conodonts. Specimens have been described from the Lower Silurian of Gun River Formation of Anticosti Island, Quebec. Two species are included under the genus, Anticostiodus fahraeusi and Anticostiodus boltoni. Both species occur near the base of the Distomodus staurognathoides zone and in an open subtidal environment.
Distomodontidae is an extinct family of conodonts.
Rhipidognathidae is a family of multielement conodonts from the Ordovician.
Oulodus is a genus of conodonts in the family Prioniodinidae.
References
- ↑ Lower Silurian Conodonts from Kentucky. E. B. Branson and C. C. Branson, Journal of Paleontology, Vol. 21, No. 6 (Nov., 1947), pages 549-556 (Stable URL retrieved 29 April 2016)
- ↑ Early Silurian Conodonts from the Quinton Formation of the Broken River Region (North-Eastern Australia). Andrew Simpson (pdf, retrieved 4 June 2016)
- ↑ Johnognathus huddlei Mashkova, an element in the apparatus of Distomodus staurognathoides (Walliser)—Conodonta (Silurian). D. Jeffrey Over and Brian D. E. Chatterton, Journal of Paleontology, May 1987, Volume 61, Issue 03, pages 579-582, doi:10.1017/S0022336000028742
- ↑ Local variations in the distribution of Silurian conodonts of the Distomodus kentuckyensis Zone of the Oslo Region, Norway. MB Idris, Norsk geologisk tidsskrift, 1984
