title: Ultrastructural studies on the spermatozoa of two primitive crustaceans Hutchinsoniella macracantha and Derocheilocaris typicus.
mesh_terms: D000818:Animals; D003445:Crustacea / Q000166:cytology*; D008297:Male; D008854:Microscopy, Electron; D008858:Microscopy, Phase-Contrast; D013094:Spermatozoa / Q000166:cytology*