Pentagnostus
| Pentagnostus Temporal range:
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| Pentagnostus brighamensis, 6mm, Spence Formation | |
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| Superfamily: | Agnostoidea
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| Genus: | Pentagnostus Lermontova, 1940
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Pentagnostus is a genus of trilobites restricted to the Middle Cambrian. Its remains have been found in Siberia, Australia, North America, Scandinavia, and Kazakhstan.[1]
Taxonomy[]
Schematic showing the relationship between both subgenera of Pentagnostus (light green), the ancestral Archaeagnostus (darker green) and the descending Ptychagnostidae (red). Based on E. B. Naimark (2012). Hundred species of the genus Peronopsis Hawle et Corda, 1847. Paleontological Journal 46(9):945-1057
The probable ancestor of Pentagnostus is Archaeagnostus. Two subgenera can be distinguished. The nominate subgenus occurred first and developed into the later subgenus Pentagnostus (Meragnostus) and the family Ptychagnostidae.[1]
Species and distribution[]
Subgenus Pentagnostus (Pentagnostus)[]
- P. anabarensis Lermontova, 1940 (type)
- P. ademptus (Prokovskaya and Jegorova, 1972)
- P. brighamensis (Resser, 1938)
- P. shergouldi Laurie, 2004
- P. veles Öpik, 1979 synonym P. endemicus.[1]
Subgenus Pentagnostus (Meragnostus)[]
- P. bonnerensis (Resser, 1939) (type) synonyms P. admirabilis and Agnostus lautus.
- P. bulkurensis (Prokovskaya and Pregel, 1982)
- P. remotus (Prokovskaya and Jegorova, 1969)
- P. segmentus (Robison, 1964)
- P. shabactensis Ergaliev, 2008 synonym Peronopsis ultima Ergaliev, 1980 non Poulsen 1960.[1]
References[]
Categories:
- Peronopsidae
- Agnostida genera
- Cambrian trilobites
- Cambrian trilobites of Australia
- Fossils of Kazakhstan
- Fossils of Russia
- Paleozoic life of British Columbia