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Random coincidence? Best friends? Lovers?! We'll never know! These two ended up side by side at the bottom of a shallow sea and then spent millions of years cuddled together.
Brass cast (about 22mm x 19mm) of two Elrathia kingii trilobite fossils set in a sterling silver ring, size 7.
Ontogeny refers an organism's origination and development from fertilization of the egg to adulthood. Generally speaking, the study of trilobite ontogeny focuses primarily on the number of segments in the organism. The younger the trilobite, the fewer segments it had.
The specimen used to make this ring is an Elrathia kingii trilobite from Utah which lived during the middle Cambrain - about 513 to 501 million years ago!