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Upper Triassic deposits of the Leigh Creek Coal Measures in South Australia yield exquisitely preserved plant fossils of a typical mid- to high-latitude Gondwanan flora. Here, we present a detailed cuticular analysis of the ginkgoalean leaf  Sphenobaiera insecta  J.M. Anderson et H.M. Anderson nov. emend., which is characterized by an unlobed or once-lobed, elliptic to oblanceolate lamina, abundant round to fusiform resin bodies, and absence of interveinal striae. We also propose an emendation to the genus diagnosis so that  Sphenobaiera  encompasses also unlobed leaves such as most of those attributed to  S. insecta . Such leaves may be distinguished from morphologically similar co-occurring leaf taxa, such as  Heidiphyllum elongatum  (Pinales) and  Rochipteris  spp. (Petriellales), based on the characteristic resin bodies and sporadic occurrence of vein dichotomies in the central lamina.  Sphenobaiera insecta  leaves show common evidence of a particular type of herbivory damage along the leaf margin in the form of small (1–1.5-mm-long) semi-circular patches each lined by a crescent-shaped, darkened reaction rim.

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Sphenobaiera insecta  from the Upper Triassic of South Australia, with a clarification of the genus  Sphenobaiera  (fossil Ginkgophyta) and its delimitation from similar foliage genera