Spermatogenesis, spermiogenesis and sperm structure in Crenobia (Planaria) alpina (Dana).
D000818:Animals; D002455:Cell Division; D002467:Cell Nucleus; D003593:Cytoplasm; D005407:Flagella; D008297:Male; D008858:Microscopy, Phase-Contrast; D013094:Spermatozoa / Q000166:cytology* / Q000254:growth & development; D013194:Staining and Labeling; D014419:Turbellaria / Q000166:cytology*