Brachiopods are the oldest known shelly invertebrate fossils. Askepasma saproconcha Topper, a Paterinida, is the oldest known brachiopod coming from a pre-trilobitic strata (Terreneuvian, Cambrian Stage 2, lower Atdabanian; ~526–530 Ma) within the Early Cambrian succession from South Australia (Topper et al. 2013).
KeywordsLate Ordovician Ventral Valve Dorsal Valve Hinge Line Brachiopod Shell
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