A trilobite from the lower Ordovician Al Rose Formation, Inyo County, California, called scientifically Cryptolithus sp. Reddish-brown coloration of specimen derives from replacement by the mineral limonite, a variety of hydrated iron oxide. This was a blind filter-feeding species of trilobite. Genal spines outrageously long in proportion to the arthropodal body. Sometimes called a lace-collar trilobite.

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