''Irinia'' is an
extinct
Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...
genus
Genus ( plural genera ) is a taxonomic rank used in the biological classification of extant taxon, living and fossil organisms as well as Virus classification#ICTV classification, viruses. In the hierarchy of biological classification, genus com ...
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 in the family
Anomocaridae
Anomocaridae is a family of trilobites, containing the following genera:
*'' Abharella''
*'' Afghanocare''
*'' Amginia''
*'' Anomocare''
*'' Anomocarina''
*'' Anomocarioides''
*'' Anomocariopsis''
*'' Callaspis''
*'' Chondranomocare''
*'' Dilata ...
. It lived during the
Cambrian Period
The Cambrian Period ( ; sometimes symbolized C with bar, Ꞓ) was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon. The Cambrian lasted 53.4 million years from the end of the preceding Ediacaran Period 538.8 million ...
that lasted from approximately 539 to 485 million years ago.
References
Cambrian trilobites
Anomocaridae
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