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''Pentagnostus'' is a
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.
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of living and fossil organisms as well as viruses. In the hierarchy of biological classification, genus comes above species and below family. In binomial n ...
of trilobite
Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the ...
s restricted to the Middle Cambrian
Middle or The Middle may refer to:
* Centre (geometry), the point equally distant from the outer limits.
Places
* Middle (sheading), a subdivision of the Isle of Man
* Middle Bay (disambiguation)
* Middle Brook (disambiguation)
* Middle Creek ...
. Its remains have been found in Siberia, Australia, North America, Scandinavia
Scandinavia; Sámi languages: /. ( ) is a subregion in Northern Europe, with strong historical, cultural, and linguistic ties between its constituent peoples. In English usage, ''Scandinavia'' most commonly refers to Denmark, Norway, and Swe ...
, and Kazakhstan
Kazakhstan, officially the Republic of Kazakhstan, is a transcontinental country located mainly in Central Asia and partly in Eastern Europe. It borders Russia
Russia (, , ), or the Russian Federation, is a transcontinental coun ...
.
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.
Species and distribution
Subgenus ''Pentagnostus (Pentagnostus)''
* ''P. anabarensis'' Lermontova, 1940 (type
Type may refer to:
Science and technology Computing
* Typing, producing text via a keyboard, typewriter, etc.
* Data type, collection of values used for computations.
* File type
* TYPE (DOS command), a command to display contents of a file.
* Ty ...
)
* ''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
Type may refer to:
Science and technology Computing
* Typing, producing text via a keyboard, typewriter, etc.
* Data type, collection of values used for computations.
* File type
* TYPE (DOS command), a command to display contents of a file.
* Ty ...
) 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
{{Taxonbar, from=Q7164963 Peronopsidae Agnostida genera Cambrian trilobites Cambrian trilobites of Australia Fossils of Kazakhstan Fossils of Russia Paleozoic life of British Columbia Cambrian genus extinctions