Cross-sections of spermatozoa of P. shantungensis. A Acrosome, showing the dothideoid acrosome B–E serial cross-sections of head showing the dothideoid acrosome (a), the nucleus (N), and the plasma membrane (pm) F oval nucleus (N) G–N nucleus-flagellum transition region, showing the nucleus (N), mitochondrial derivatives (md), accessory bodies (ab), axoneme (ax). The asterisk indicates the centriolar adjunct (ca). Scale bars: 0.5 µm (B–D); 0.2 µm (A, K, L, N); 0.1 µm (E–J, M).