Pentagnostus
| Pentagnostus Temporal range:
| |
|---|---|
| Pentagnostus brighamensis, 6mm, Spence Formation | |
| Scientific classification | |
| Kingdom: | |
| Phylum: | |
| Class: | |
| Order: | |
| Suborder: | |
| Superfamily: | |
| Family: | |
| Genus: | Pentagnostus Lermontova, 1940
|
| subgenera | |
| |
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
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]