title: [Ultrastructural study of testis of Polycelis tenuis and Polycelis nigra (Planarians). Evolution of male germ cells before spermatogenesis].
mesh_terms: D000818:Animals; D002466:Cell Nucleolus; D002467:Cell Nucleus; D004721:Endoplasmic Reticulum; D005854:Germ Cells / Q000502:physiology*; D006056:Golgi Apparatus; D008297:Male; D008540:Meiosis; D008854:Microscopy, Electron; D008870:Microtubules; D008928:Mitochondria; D008938:Mitosis; D010986:Platyhelminths / Q000033:anatomy & histology*; D013091:Spermatogenesis; D013094:Spermatozoa / Q000166:cytology*; D013737:Testis / Q000166:cytology*
vernacular_title: Etude ultrastructurale des testicules de Polycelis tenuis et Polycelis nigra (Planaries). Evolution des cellules germinales mâles avant la spermiogenèse.