The eyes in three genera of hagfish (Eptatretus, Paramyxine and Myxine)--a case of degenerative evolution.
D000818:Animals; D005075:Biological Evolution; D004847:Epithelial Cells; D005123:Eye / Q000033:anatomy & histology*; D005399:Fishes / Q000033:anatomy & histology*; D006196:Hagfishes / Q000033:anatomy & histology*; D008855:Microscopy, Electron, Scanning; D010786:Photoreceptor Cells; D012160:Retina / Q000033:anatomy & histology; D012162:Retinal Degeneration; D012880:Skin Pigmentation; D014785:Vision, Ocular; D014822:Vitreous Body