Tribrachidium

Tribrachidium heraldicum is a tri-radially symmetrical fossil animal that lived in the late Ediacaran (Vendian) seas. In life, it was hemispherical in form. T. heraldicum is the best known member of the extinct group Trilobozoa.

Etymology
The generic name Tribrachidium is derived from combination of the Greek τρία (tria, "three") + Latin brachium ("arm") + diminutive suffix -idium. The specific name T. heraldicum references the similarity of the pattern of this fossil with the well-known heraldic triskelion design, such as the coat of arms of the Isle of Man.

Occurrence
Tribrachidium fossils were first discovered in the Ediacara Member of the Rawnslay Quartzite, Flinders Ranges in South Australia.[1][2] This fossil is also known from the Mogilev Formation in the Dniester River Basin, Podolia, Ukraine[3] and from the Verkhovka, Zimnegory an Yorga Formations in the White Sea area of the Arkhangelsk Region, Russia.