Geyer, G., Landing, E., Meier, S., Höhn, S., 2022. Oldest known West Gondwanan graptolite: Ovetograptus? sp. (lower Agdzian/lowest Wuliuan; basal Middle Cambrian) of the Franconian Forest, Germany, and review of pre-Furongian graptolithoids. PalZ. doi:10.1007/s12542-022-00627-5