Operculum papillare

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The operculum papillare is the iris found in the eyes of elasmobranchs (skates, sharks and rays). [1] It can undergo pupillary light reflex to such an extent that the eye is essentially shut off. It is sometimes called the golden iris because of the shine it sometimes causes.

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References

  1. Voronina, E. P. (2010-11-01). "On morphology and taxonomy of scophthalmids". Journal of Ichthyology. 50 (9): 695–703. doi:10.1134/S0032945210090018. ISSN   1555-6425.