Myxidium cf. immersum spores recovered from the Australian Museum. Light microscopy (A), histological section through the gallbladder stained with Giemsa (B) and scanning electron microscopy on black background. White arrows show the surface ridges and black arrows show two polar capsules per myxospore. Scale bar 10 μm (A, B), 2.5 μm (C); AM#158500 (A, C; Bufo marinus) and AM#162439 (B; Limnodynastes peronii).