A checklist of Australian marine Cenozoic Mollusca Author Darragh, Thomas A. text Memoirs of Museum Victoria 2024 2024-08-23 83 37 206 https://doi.org/10.24199/j.mmv.2024.83.02 journal article 10.24199/j.mmv.2024.83.02 1447-2554 Brocchinia semicostata ( Tate, 1889 ) comb. nov. Cancellaria semicostata Tate, 1889: 157 , pl. 10, fig. 3. Distribution . Otway Basin: Muddy Creek Formation ( type ). Age : middle Miocene. Sydaphera Iredale, 1929