Nearctic Anthomyzidae: a monograph of Anthomyza and allied genera (Diptera) Author Roháćek, Jindřich Author Barber, Kevin N. text Acta Entomologica Musei Nationalis Pragae 2016 suppl. 2016-12-30 56 1 412 journal article 9539 10.5281/zenodo.4272829 e8b0cf7e-6ff3-40d9-8e92-87e099b9cefe 0374-1036 4272829 urn:lsid:zoobank.org:pub:E95E58A5-E0F1-4237-9D7C-4A81BB3120DD The Arganthomyza duplex group The group was established by ROHÁĆEK & BARBER (2013) and diagnosed by two apomorphic features: (1) the nlum of the distiphallus basally widened and (2) the apex of the ventral receptacle vermicularly twisted. The latter character is reminiscent of the structure of the ventral receptacle of the majority of Anthomyza species (see below). This homoplasy probably evolved independently in the A. duplex group from the distinctly ancestral form with a simple apex of the ventral receptacle occurring in the A. socculata group which is the sister group of the A. duplex group as demonstrated by both the morphological ( ROHÁĆEK & BARBER 2013 : Fig. 173 ) and the molecular ( ROHÁĆEK & TÓTHOVÁ 2014 : Fig. 1 ) data analyses. The group comprises three Nearctic species: A. acuticuspis , A. bivittata and A. duplex .