Pentagnostus
Extinct genus of trilobites
From Wikipedia, the free encyclopedia
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]
| 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 | |
| |
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]