Biology:Pentagnostus
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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
- ↑ 1.0 1.1 1.2 1.3 Cite error: Invalid
<ref>tag; no text was provided for refs namedNaimark - ↑ Laurie, John. The Westergård specimens of the early Middle Cambrian agnostid Pentagnostus praecurrens (Westergård, 1936). https://www.academia.edu/60960397/The_Westerg%C3%A5rd_specimens_of_the_early_Middle_Cambrian_agnostid_Pentagnostus_praecurrens_Westerg%C3%A5rd_1936_.
Wikidata ☰ Q7164963 entry
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