A secondary eyelid often occurs in species that have a cornea. The eyelid encroaches over the cornea from the ventral side. The photograph on the left shows a secondary eyelid that is nearly closed. In the photograph on the right the cornea is more opaque in this preserved animal and the secondary eyelid is more open.
Cephalopod Secondary EyelidRichard E. Young, Michael Vecchione, and Katharina M. Mangold (1922-2003)
Page copyright © 2001 , , and Katharina M. Mangold (1922-2003)
Page: Tree of Life Cephalopod Secondary Eyelid Authored by Richard E. Young, Michael Vecchione, and Katharina M. Mangold (1922-2003). The TEXT of this page is licensed under the Creative Commons Attribution-NonCommercial License - Version 3.0. Note that images and other media featured on this page are each governed by their own license, and they may or may not be available for reuse. Click on an image or a media link to access the media data window, which provides the relevant licensing information. For the general terms and conditions of ToL material reuse and redistribution, please see the Tree of Life Copyright Policies.