Tribrachidium heraldicum


 * When = 558-555 mya


 * Kingdom = Animalia


 * Phylum = Trilobozoa


 * Class = Tribrachidia


 * Order = Tribrachidida


 * Family = Tribrachididae


 * Genus = Tribrachidium

Tribrachidium is an extinct genus of trilobozoan. The genus includes one species, T. heraldicum, known from Rawnslay Quartzite, Flinders Ranges, in South Australia, Dniester River Basin, Podolia, in Ukraine, and the Verkhovka, Zimnegory, and Yorga Formations in the White Sea, Arkhangelsk Region, in Russia.

Its name derives from Latin tri = three, brach = arm, and the suffix idium. The species ranges in size from 3 millimeters (0.3 centimeters) to 5 centimeters in diameter.