title: Spermatozoa and spermatids of the crinoid Antedon petasus, with a note on primitive spermatozoa from deuterostome animals.
mesh_terms: D000177:Acrosome / Q000648:ultrastructure; D000818:Animals; D002467:Cell Nucleus / Q000648:ultrastructure; D004447:Echinodermata / Q000166:cytology*; D005404:Fixatives; D008297:Male; D008928:Mitochondria / Q000648:ultrastructure; D009940:Organoids / Q000648:ultrastructure; D013082:Sperm Tail / Q000648:ultrastructure; D013087:Spermatids / Q000648:ultrastructure*; D013094:Spermatozoa / Q000648:ultrastructure*
chemical_list: D005404:Fixatives