Pentagnostus
| Pentagnostus Temporal range:
| |
|---|---|
| Pentagnostus brighamensis, 6mm, Spence Formation | |
| Scientific classification | |
| Kingdom: | Animalia |
| Phylum: | Arthropoda |
| Clade: | †Artiopoda |
| Class: | †Trilobita (?) |
| Order: | †Agnostida |
| Family: | †Peronopsidae |
| Genus: | †Pentagnostus Lermontova, 1940 |
| Subgenera | |
| |
Pentagnostus is a genus of small, blind, agnostid 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]
- P. praecurrens (Westergård, 1936)[2]
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
- ^ a b c d e Naimark, E.B. (2012). "Hundred species of the Genus Peronopsis Hawle et Corda, 1847". Paleontological Journal. 46 (9): 945–1057. Bibcode:2012PalJ...46..945N. doi:10.1134/S0031030112090018. S2CID 85130465.
- ^ Laurie, John. "The Westergård specimens of the early Middle Cambrian agnostid Pentagnostus praecurrens (Westergård, 1936)".
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