o:3249 Hard ticks in Burmese amber with Australasian affinities en Three examples of metastriate hard ticks (Ixodida: Ixodidae) with apparent affinities to modern Australasian genera are described from the mid-Cretaceous (ca. 100 Ma) Burmese amber of Myanmar. Two nymphs of Bothriocroton muelleri sp. nov. represent the oldest (and only) fossil record of this genus, living members of which are restricted to Australia and predominantly feed on monitor lizards, snakes and echidnas. A female of Archaeocroton kaufmani sp. nov. shares its basis capitulum shape with the tuatara tick Archaeocroton sphenodonti (Dumbleton, 1943), the only extant member of this genus and an endemic species for New Zealand. The presence of 2 Australasian genera in Burmese amber is consistent with a previous record of an Ixodes Latreille, 1795 tick from this deposit which resembles Australian members of this genus. They further support an emerging hypothesis that fauna of the amber forest, which may have been on an island at the time of deposition, was at least partly Gondwanan in origin. A revised evolutionary tree for Ixodida is presented compiling data from several new Burmese amber ticks described in the last few years. Nuttalliellidae Acari; 1st Description; Ixodidae; Genus; List; Evolution; Parasitiformes; Redescription; Reevaluation; Ectoparasite 1552099 10.1017/S0031182022001585 2024-07-16T08:50:11.440Z 44 yes 46 Lidia Chitimia-Dobler Bundeswehr Institute of Microbiology Jason A. Dunlop Leibniz Institute for Evolution and Biodiversity Science person 0000-0002-0179-6640 Timo Pfeffer Keyence Deutschland GmbH person Felix Würzinger Keyence Deutschland GmbH person Stephan Handschuh University of Veterinary Medicine Vienna person 0000-0002-2140-7892 Ben J. Mans University of South Africa person 0000-0002-0177-0029 application/pdf 1600633 https://phaidra.vetmeduni.ac.at/o:3249 no yes 16 70 1552253 Parasitology 15 150 2 157 171 Cambridge University Press 2022