Pentagnostus


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

The probable ancestor of Pentagnostus is Archaeagnostus. Two subgenera can be distinguished. The nominate subgenus occurred first and developed into the later subgenus Pentagnostus and the family Ptychagnostidae.

Species and distribution

Subgenus ''Pentagnostus (Pentagnostus)''

P. anabarensis Lermontova, 1940 P. ademptus P. brighamensis P. shergouldi Laurie, 2004P. veles Öpik, 1979 synonym P. endemicus.

Subgenus ''Pentagnostus (Meragnostus)''

P. bonnerensis synonyms P. admirabilis and Agnostus lautus.P. bulkurensis P. remotus P. segmentus P. shabactensis Ergaliev, 2008 synonym Peronopsis ultima Ergaliev, 1980 non Poulsen 1960.