Four different types of corona structure in Oodera, in dorso-frontal view. Antennal scrobes are left of corona, eye is right of corona; a interrupted (exemplar species imaged: O. namibiensis sp. n.) b continuous (exemplar species imaged: O. formosa) c square (exemplar species imaged: O. longicollis) d three- to four-part (exemplar species imaged: O. leibnizi sp. n.). For additional definitions of corona types see main text.