Primoriella

Primoriella Temporal range: latest Lower Cambrian PreЄ Є O S D C P T J K Pg N ↓
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Trilobita
Order:	Redlichiida
Suborder:	Redlichiina
Family:	Paradoxididae
Genus:	Primoriella Repina, 1973
Species
P. bella Repina, 1973 (type species)

Primoriella is a genus of trilobite, an extinct group of marine arthropods. The only known species, P. bella occurs in the uppermost Lower Cambrian of Russia (Redlichina culmenica beds, far eastern Siberia). It is related to Paradoxides, but can be distinguished from it by only slightly forward expansion of the (glabella) a character shared with Anabaraceps and Schagonaria. In Primoriella however, the front of the glabella touches the roll-like border, causing it to slightly bulge forward, while in Anabaraceps there is a roll-like preglabellar field as wide as the flat border in front of it. The glabella of Primordiella is less than twice as long as wide, and differs from Schagonaria in which it is more than twice as long as wide.^[1] The thorax and pygidium are not known.

References

1. Whittington, H. B.; et al., eds. (1997). Part O, Revised, Volume 1 – Trilobita – Introduction, Order Agnostida, Order Redlichiida. Treatise on Invertebrate Paleontology. pp. 473, 478.