Pentagnostus
Extinct genus of trilobites
title: "Pentagnostus" type: doc version: 1 created: 2026-02-28 author: "Wikipedia contributors" status: active scope: public tags: ["peronopsidae", "agnostida-genera", "cambrian-trilobites", "cambrian-trilobites-of-australia", "fossils-of-kazakhstan", "fossils-of-russia", "paleozoic-life-of-british-columbia", "cambrian-genus-extinctions"] description: "Extinct genus of trilobites" topic_path: "geography/australia" source: "https://en.wikipedia.org/wiki/Pentagnostus" license: "CC BY-SA 4.0" wikipedia_page_id: 0 wikipedia_revision_id: 0
::summary Extinct genus of trilobites ::
| fossil_range = | image = Pentagnostus brighamensis sharper only.jpg | image_caption = Pentagnostus brighamensis, 6mm, Spence Formation | taxon = Pentagnostus | authority = Lermontova, 1940 | subdivision_ranks = subgenera | subdivision =
- Pentagnostus (Pentagnostus)
- Pentagnostus (Meragnostus) Naimark, 2012 and see text for species
Pentagnostus is a genus of trilobites restricted to the Middle Cambrian. Its remains have been found in Siberia, Australia, North America, Scandinavia, and Kazakhstan.
Taxonomy
::figure[src="https://upload.wikimedia.org/wikipedia/commons/8/85/Gradogram_Pentagnostus.jpg" caption="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.
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.
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.
References
References
- Naimark, E.B.. (2012). "Hundred species of the Genus ''Peronopsis'' Hawle et Corda, 1847". Paleontological Journal.
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