''Estaingia bilobata'' is a species 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 ...

from the lower

Cambrian 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 ...

period. Their fossils are found chiefly in Australia.

References

* * * * * Estaingiidae Cambrian trilobites of Australia Emu Bay Shale {{Ptychopariida-stub Cambrian genus extinctions