Early Carboniferous Gastropoda from the Tamworth Belt, New South Wales, Australia Author Yoo, E. K. text Records of the Australian Museum 1994 1994-05-19 46 1 63 120 https://journals.australian.museum/yoo-1994-rec-aust-mus-461-63120/ journal article 10.3853/j.0067-1975.46.1994.18 b5d2a24f-697a-4fc3-9612-978fb532e815 0067-1975 4654599 Cyclozyga sinusigera Yoo PI. 16 figs 6-7 Cyclozyga sinusigera Yoo, 1988: 247 , figs 92-94. Dimensions. Figured specimen ( F78480 ): H 1.3 mm , W 0.4 mm . Additional material. 1 specimen from 'Marohn' (Locality 28). Stratigraphic position. In upper part of the Dangarfield Formation. Remarks. This is an extremely rare species. Cyclozyga sp. (PI. 19 figs 5-8) from 'Kyndalyn' resembles C. sinusigera Yoo in shell shape and ornamentation, but differs in having closely spaced collabral lirae on teleoconch. Only two specimens of Cyclozyga sp. are obtained. The systematic position of Cyclozyga was discussed by Knight (1930a) , and Hoare & Sturgeon (1978) . The North American species of Cyclozyga have more strongly developed revolving costellae and are more attenuate in form.