''Ithyektyphus'' is an extinct genus from a well-known class of fossil marine

arthropod Arthropods (, (gen. ποδός)) are invertebrate animals with an exoskeleton, a segmented body, and paired jointed appendages. Arthropods form the phylum Arthropoda. They are distinguished by their jointed limbs and cuticle made of chiti ...

s, 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 ...

s. It lived during the Cambrian Period, which lasted from approximately 542 to 488 million years ago.

References

Alokistocaridae Cambrian trilobites Fossils of the United States {{ptychopariida-stub