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Examples of scleral rings in extant saurians and fossil synapsids. (a) Varanus niloticus (Varanidae; ROM R7303). (b) Rhachodactylus auriculatus (Gekkonidae; ROM R7510). (c) Sauroctonus cf. parringtoni (Gorgonopsia; SAM-PK-K10034). (d) Undescribed Zambian baurioid (Therocephalia; NHCC LB44). See the electronic supplementary material for institutional abbreviations. (Online version in colour.)
