Abstract
Three names are available for two species of spiriferids with multi‐ribbed valve flanks in the Berriedale Limestone in Tasmania. The valid names for the species are now considered to be Trigonotreta stokesi Koenig, 1825 and "Spirifer” tasmaniensis Morris, 1845; the other available name, Grantonia hobartensis, 1953, is a synonym of Trigonotreta stokesi. Grantonia Brown, 1953 (type species, Grantonia hobartensis) is therefore a synonym of Trigonotreta Koenig, 1825 (type species, Trigonotreta stokesi).

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