Morphology of invertebrate photoreceptors.
D000818:Animals; D002696:Chlamydomonas / Q000648:ultrastructure; D005055:Euglena / Q000648:ultrastructure; D006372:Helix, Snails; D007448:Invertebrates; D008854:Microscopy, Electron; D010786:Photoreceptor Cells / Q000648:ultrastructure*; D012160:Retina / Q000648:ultrastructure; D013045:Species Specificity