title: A scanning electron microscope study on Gregarina sp. from Udeopsylla nigra.
mesh_terms: D000818:Animals; D016782:Apicomplexa / Q000166:cytology* / Q000302:isolation & purification / Q000502:physiology; D005854:Germ Cells; D007313:Insecta; D008855:Microscopy, Electron, Scanning