title: Early stages of spermatozoan development in the colonial hydroid Campanularia flexuosa.
mesh_terms: D002454:Cell Differentiation; D003063:Cnidaria; D005407:Flagella; D006056:Golgi Apparatus; D006066:Gonads / Q000166:cytology; D008297:Male; D008854:Microscopy, Electron; D008928:Mitochondria; D013094:Spermatozoa / Q000166:cytology / Q000254:growth & development*