Today, Eugeneodontida is a topic that generates great interest and debate in different areas. From the field of politics to science and technology, Eugeneodontida has captured the attention of experts and the general public. In this article, we will analyze the implications and repercussions of Eugeneodontida, as well as its influence on today's society. We will explore different perspectives and opinions on the matter, with the aim of offering a complete and enriching overview of this very relevant topic. From its origins to its evolution, Eugeneodontida has played a crucial role in the history and development of humanity, and its impact will continue to be a topic of discussion for years to come.
Eugeneodontida | |
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Helicoprion davisii | |
Edestus heinrichi | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Chondrichthyes |
Subclass: | Holocephali |
Order: | †Eugeneodontida Zangerl, 1981 |
Synonyms | |
The Eugeneodontida, sometimes also called Eugeneodontiformes, is an extinct and poorly known order of cartilaginous fishes. They possessed "tooth-whorls" on the symphysis of either the lower or both jaws and pectoral fins supported by long radials. They probably lacked pelvic fins and anal fins. The palatoquadrate was either fused to the skull or reduced. Now determined to be within the Holocephali, their closest living relatives are ratfish. The eugeneodonts are named after paleontologist Eugene S. Richardson, Jr. The Eugeneodontida disappeared in the Early Triassic. The geologically youngest fossils of the group are known from the Sulphur Mountain Formation (western Canada), Vardebukta Formation (Svalbard, Norway) and Wordie Creek Formation (Greenland).
Members of the Eugeneodontida are further classified into different families, the most well-preserved members that have been discovered are commonly placed within the families Helicoprionidae ("spiral saws"), and Edestidae ("those which devour"), the former containing the genera Helicoprion, Sarcoprion, and Parahelicoprion, and the latter containing the genera Edestus, Lestrodus, and Metaxyacanthus. All eugeneodonts are thought to have been obligate carnivores, with each genus having specialized feeding behaviors, territory ranges, and specific prey.
Among the eugeneodonts, some members of the superfamily Edestoidea are probably the largest animals of their time during the Late Carboniferous, with Edestus reaching about or exceeding 6.7 metres (22 ft) in length, and with Helicoprion measuring over 7.6 metres (25 ft) long.
The list below shows taxa included within Eugeneodontida.