Scanning electron micrographs of Haplodontium altunense A dorsal views of peristome B dorsal views of peristome with annulus C dorsal surface of exostome teeth proximally showing the pores and the raised and membranous chomata horizontal lines with united lamellae between two teeth D dorsal surface of exostome teeth distally showing the large papillae along the median vertical lines E dorsal surface of exostome teeth distally showing the endostomial material adherent to the teeth F ventral views of peristome G ventral surface of peristome proximally showing the smooth endostome basal membrane H ventral views of peristome distally I, J ventral surface of peristome medially and distally showing the endostomial material adherent to the teeth K spore L exine ornamentation of spore. Photographed by Xiaorui Wang from the holotype (HBNU!).