''Genevievella'' is a genus of

trilobite Trilobites (; meaning "three lobes") are extinct marine arthropods that form the class Trilobita. Trilobites form one of the earliest-known groups of arthropods. The first appearance of trilobites in the fossil record defines the base of the At ...

s with a short inverted egg-shaped outline, a wide headshield, small eyes, and long genal spines. The backrim of the headshield is inflated and overhangs the first of the 9 thorax segments. The 8th thorax segment from the front bears a backward directed spine that reaches beyond the back end of the exoskeleton. It has an almost oval tailshield with 5 pairs of pleural furrows. It lived during the

Upper Cambrian The Furongian is the fourth and final epoch and series of the Cambrian. It lasted from to million years ago. It succeeds the Miaolingian series of the Cambrian and precedes the Lower Ordovician Tremadocian Stage. It is subdivided into three ...

in what are today Canada and the United States.

Distribution

* ''G. caelata'' is known from the Upper Cambrian of Australia (Mindyallan, Upper beds Member, Mungerbar Formation, Glenormiston, Queensland, 22.9° S, 138.8° E). * ''G. simon'', ''G. cuniculaena'', ''G. raggedi'' and ''G. campbellina'' have been found in the Upper Cambrian of Canada (Dresbachian, Rabbitkettle Formation, Yukon, 62.7° N, 128.4° W). * ''G. campbellina'' occurs in the Upper Cambrian of the United States (Merioneth: Warriorsmark, Huntingdon, Huntingdon; Warrior Formation, near Waddle, Centre County, all Pennsylvania, 40.8° N, 77.9° W) * ''G. spinox'' has been excavated from the Upper Cambrian of the United States (Dresbachian, ''Coosella'' zone, Riley Formation, Central Texas, 30.3° N, 97.7° W) * ''G. bigranulosa'' is present in the Upper Cambrian of China (Guzhangian, ''Glyptagnostus stolidotus'' trilobite zone and Paibian, ''Glyptagnostus reticulatus'' trilobite zone, both Huaqiao Formation, Hunan, 28.4° N, 109.5° E). ''cited in''

References

Llanoaspididae Cambrian trilobites Fossils of the United States Fossils of Canada Paleontology in Yukon Paleozoic life of Yukon {{Asaphida-stub