Olenina
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''Olenina'' is an extinct suborder of the
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 ...
order
Ptychopariida Ptychopariida is a large, heterogeneous order of trilobite containing some of the most primitive species known. The earliest species occurred in the second half of the Lower Cambrian, and the last species did not survive the Ordovician–Silurian ...
.


Subdivisions

*Superfamily Olenoidea **Family Ellipsocephaloididae **Family
Olenidae Olenidae is a family of ptychopariid trilobites. Some genera, '' Balnibarbi'' and '' Cloacaspis'', are thought to have evolved a symbiotic relationship with sulfur-eating bacteria from which they derived nutrition. Genera * Acerocare * Acero ...
*Superfamily ''Incertae sedis'' **Genus '' Triarthrus''


References

Ptychopariida Arthropod suborders {{ptychopariida-stub