Original Description of Conchothyra expedita by Finlay & Marwick, 1937:
- "Shell of moderate size, in general features like C. australis, but having much thinner callus. This callus is arranged somewhat differently from that of australis, the prietal callus-pad having thick projecting ends forming a well-defined sinus posteriorly and anteriorly. Tha anterior sinus below the parietal-pad is situated on the base of the shell, and on australis it is relatively shallow. The deep sinus of expedita thus forms an easy guide to the species. In sculpture, also, expedita differs, especially in the weaker development of the double basal keel, the two cingula of which are not so well separated as in australis. Further, the nodules on the shoulder angle are broader, stronger, and more axially extended."
Locus typicus: Boulder Hill, near Dunedin, Otago Region, South Island, New Zealand
Stratum typicum: Paleocene
Measurements: Height 40 mm, width 30 mm
Conchothyra expedita Finlay & Marwick, 1937; Holotype; Paleocene; Boulder Hill, near Dunedin, Otago Region, South Island, New Zealand; Copyright Auckland Museum, Coll. Auckland Museum no. AK 70196; Copyright Auckland Museum