title: Fine structure of the ocellus of the hydromedusan, Spirocodon saltatrix. I. Receptor cells.
mesh_terms: D000818:Animals; D003063:Cnidaria / Q000648:ultrastructure*; D008854:Microscopy, Electron; D009474:Neurons / Q000648:ultrastructure; D010786:Photoreceptor Cells / Q000648:ultrastructure*; D013569:Synapses / Q000648:ultrastructure*