Adult and larval characters place the monophyletic Ectemnorhinus-group of genera firmly within the former Adelognatha and new concept of Brachycerinae. The group, previously with tribal or subfamily status, is most closely related to the genera Heterexis Broun and Oclandius Blanchard from the Auckland and Campbell Islands. A cladistic analysis of the genera based on 35 adult and 11 larval characters, resulted in the following six genera being recognised: Christensenia Brinck, Canonopsis C. O. Waterhouse, Disker Dreux & Voisin, Palirhoeus Kuschel, Bothrometopus Jeannel and Ectemnorhinus G. R. Waterhouse. Ectemnorhinus angusticollis (C. O. Waterhouse) is transferred to Bothrometopus, Mesembriorrhinus parvulus Jeannel, also transferred to Bothrometopus, is reinstated to species level. Ectemnorhinus curtus Jeannel is placed in synonymy with Ectemnorhinus fuscus Enderlein, which is removed from synonymy with Ectemnorhinus viridis G. R. Waterhouse and reinstated as valid. Ectemnorhinus hibernantium (Dreux & Voisin) is placed in synonymy with E. geniculatus Jeannel.
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Kuschel et al. (1995) studied this question.
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