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]
Pentagnostus Temporal range:
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Pentagnostus brighamensis, 6mm, Spence Formation | |
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Genus: | Pentagnostus Lermontova, 1940
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Taxonomy edit
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 edit
Subgenus Pentagnostus (Pentagnostus) edit
- 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]