title: Ultrastructure of the early vitellogenic oocyte in Tetrodontophora bielanensis (Waga) (Collembola, Apterygota).
mesh_terms: D000818:Animals; D005260:Female; D007313:Insecta / Q000254:growth & development*; D008854:Microscopy, Electron; D010063:Ovum / Q000502:physiology / Q000648:ultrastructure*