Scannning (a–b) and transmission electron microscopy (c–e) images of the myxospores of Henneguya cystigena n. sp. a–b: mxysopres exhibiting two smooth shell valves, with two tapered posterior cadual processes (black arrows). c: two polar capsules (PC) aligned parallel to the plane of sutural line (white arrows); shell valves electron-dense (black arrowheads); d: polar capsules positioned anteriorly, with a single caudal process extending posteriorly from the myxospore body. e: ultrathin transverse sections of a polar capsule revealing four coils of polar tubule (asterisks).