title: Tube-like structures in mitochondria of tunicate (Pyura vittata) spermatids.
mesh_terms: D000818:Animals; D008297:Male; D008928:Mitochondria / Q000648:ultrastructure*; D013087:Spermatids / Q000648:ultrastructure*; D013094:Spermatozoa / Q000648:ultrastructure*; D013367:Submitochondrial Particles; D014561:Urochordata