Pentagnostus

Pentagnostus
Temporal range: Middle Cambrian
Pentagnostus brighamensis, 6mm, Spence Formation
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Arthropoda
Clade: †Artiopoda
Class: †Trilobita (?)
Order: †Agnostida
Family: †Peronopsidae
Genus: †Pentagnostus
Lermontova, 1940
Subgenera
  • Pentagnostus (Pentagnostus)
  • Pentagnostus (Meragnostus) Naimark, 2012

and see text for species

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.

Taxonomy

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)

Subgenus Pentagnostus (Meragnostus)

References

  1. 1 2 3 4 5 Naimark, E.B. (2012). "Hundred species of the Genus Peronopsis Hawle et Corda, 1847". Paleontological Journal. 46 (9): 945–1057. Bibcode:2012PalJ...46..945N. doi:10.1134/S0031030112090018. S2CID 85130465.
  2. ↑ Laurie, John. "The Westergård specimens of the early Middle Cambrian agnostid Pentagnostus praecurrens (Westergård, 1936)". {{cite journal}}: Cite journal requires |journal= (help)