Mallagnostus
From Wikipedia, the free encyclopedia
| Mallagnostus Temporal range: | |
|---|---|
 | |
| Mallagnostus desideratus, cephalon | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Clade: | †Artiopoda |
| Class: | †Trilobita (?) |
| Order: | †Agnostida |
| Family: | †Weymouthiidae |
| Genus: | †Mallagnostus Howell, 1935 |
| Species | |
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| Synonyms | |
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Ladadiscus Pokrovskaya, 1959 | |
Mallagnostus Howell, 1935,[1] is a trilobite genus belonging to the family Weymouthiidae Kobayashi T. (1943),[2] Order Agnostida Salter (1864) [3] according to Whittington et al. 1997.[4] It lived during the late Lower Cambrian, with remains found in USA (New York), Canada (Newfoundland), Spain, England, Russia (Tuva, Gorno-Altayskaya), Mongolia, and the early Middle Cambrian as reported from China (Tian Shan) and Russia (Yakutia).
Mallagnostus was originally described as belonging to the Agnostina, but it is more appropriately placed in the Eodiscina. Within the Weymouthiidae, Mallagnostus belongs to a clade that further includes Tannudiscus, Jinghediscus and the Agnostina.[5]
Distribution
- M. desideratus Walcott, 1890,[6] is from the Lower Cambrian Olenellus Zone of North America.
- M. limbatus Pokrovskaya, 1959,[7] has been collected from the upper Lower Cambrian of New York,[5] and the Toyonian of the Russian Federation (Obruchev stage, Shivelig Formation, Shivelig-Khem River, Tuva, Altay-Sayan, Siberia, 51.4° N, 94.2° E) [8]
- M. llarenai Richter and Richter, 1941,[9] is found in the late Lower Cambrian of Spain (serratus Band, Herrerias-Mergel Formation, Cala).[5]