| Ozarkodinida | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | † Conodonta |
| Clade: | † Prioniodontida |
| Order: | † Ozarkodinida Dzik 1976 |
| Families | |
| |
| Synonyms | |
Polygnathida Barskov, 1995 | |
Ozarkodinida is an extinct conodont order. [1] [2] It is part of the clade Prioniodontida, also known as the "complex conodonts".
Ozarkodinida is named after the Ozark Mountains of Missouri, United States.
The feeding apparatus of ozarkodinids is composed at the front of an axial Sa element, flanked by two groups of four close-set elongate Sb and Sc elements which were inclined obliquely inwards and forwards. Above these elements lay a pair of arched and inward pointing (makellate) M elements. Behind the S-M array lay transversely oriented and bilaterally opposed (pectiniform, i.e. comb-shaped) Pb and Pa elements. [3]
Conodonts are extinct agnathan chordates resembling eels, classified in the class Conodonta. For many years, they were known only from tooth-like microfossils found in isolation and now called conodont elements. Knowledge about soft tissues remains limited. The animals are also called Conodontophora to avoid ambiguity.
Professor Mark Andrew Purnell is a British palaeontologist, Professor of Palaeobiology at the University of Leicester.
Plectronoceras is the earliest known shelled cephalopod, dating to the Late Cambrian. None of the fossils are complete, and none show the apex or aperture of the shell. Approximately half of its shell was filled with septa; 7 were recorded in a 2 centimetres (0.79 in) shell. Its shell contains transverse septa separated by about half a millimetre, with a siphuncle on its concave side. Its morphology matches closely to that hypothesised for the last common ancestor of all cephalopods.
Taphrognathus is an extinct genus of conodonts from the Dinantian.
Velumbrella is a medusoid organism with tentacles known from the Middle Cambrian of Poland, and perhaps related to Rotadiscus; the fossils depict a scleritosed disk with a U-shaped gut. It was originally related to members of the Ediacara biota but is now thought to be related to the paropsonemids.
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.
Olenecoceras is a genus of Middle Cambrian fossil that, once believed to be a cephalopod, has since been excluded from that group. The genus was established by Z. G. Balashov in 1966, from the river Olenyok.
Ladatheca is a genus of hyolith that closely resembles Turcutheca. It has a straight conch with a smooth internal surface, and is found with what may be its operculum.
Multiplacophora is a stem-group of chitons with a number of plates arranged in 7 rows along the body. They date to at least the Upper Cambrian, but two lower Cambrian fossils- Ocruranus and Trachyplax - may extend the range downwards.
Sharovipterygidae is a family of strange gliding protorosaurians from the mid-Triassic of Eurasia, notable for their short forelimbs and long, wing-like hindlimbs, which supported membranes for gliding. They are represented by Sharovipteryx and Ozimek volans.
Ozarkodina is an extinct genus of conodonts in the family Spathognathodontidae.
Complexodus is an extinct conodont genus in the family Pterospathodontidae.
Idiognathodus is an extinct conodont genus in the family Idiognathodontidae.
Jerzy Dzik is a Polish paleontologist.
Misikella is an extinct genus of conodonts. It is a genus with a tetramembrate conodont apparatus.
Cryptotaxis is an extinct genus of conodonts in the family Cryptotaxidae from the Famennian.
Protoconodonts are an extinct taxonomic group of conodonts or, possibly, Chaetognaths.
Ozimek is a genus of sharovipterygid protorosaur, a type of gliding Triassic archosauromorph reptile from Poland closely related to the Kyrgyzstani Sharovipteryx. It contains one species, O. volans, named in 2016 by Dzik and Sulej.
The conodont feeding apparatus is a series of phosphatic-mineralized elements, resembling a set of “teeth”, which are found lining the oral surface of the conodont animal.
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