New genera of acrotretids from the Cambrian of Australia and the United States

Abstract

Little is known about the paleobiogeography of Cambrian brachiopods.Cooperative studies have shown the presence of three new genera of inarticulate acrotretid brachiopods in Upper Cambrian rocks of both Australia and the United States, but none of their species are common to both regions.Ouadrisonia (type species O. minor), Dactylotreta (type species D. redunca), and Anabolotreta (type species A. tegula) are erected and their type species described from etched material.