title: Pycnogonid sperm. An example of inter-and intraspecific axonemal variation.
mesh_terms: D000818:Animals; D001181:Arthropods / Q000033:anatomy & histology*; D005407:Flagella / Q000502:physiology / Q000648:ultrastructure; D014644:Genetic Variation; D008297:Male; D008854:Microscopy, Electron; D008858:Microscopy, Phase-Contrast; D009068:Movement; D013094:Spermatozoa / Q000502:physiology / Q000648:ultrastructure*