Arganthomyza duplex, Rohacek & Barber, 2013

Roháćek, Jindřich & Barber, Kevin N., 2016, Nearctic Anthomyzidae: a monograph of Anthomyza and allied genera (Diptera), Acta Entomologica Musei Nationalis Pragae (suppl.) 56, pp. 1-412 : 78

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 .

Figures

Figs 168–175. Arganthomyza disjuncta Roháček & Barber, 2013, paratype male (Canada:Alberta). 168 – external genitalia, caudally; 169 – base of phallapodeme, dorsally; 170 – external genitalia, laterally; 171 – hypandrial complex, laterally; 172 – transandrium, caudally; 173 – apex of nlum of distiphallus, anteroventrally (widest extension); 174 – aedeagal complex, laterally; 175 – gonostylus, lateroventrally (widest extension). Scales = 0.05 mm (Figs 173, 175) and 0.1 mm (others). Adapted from ROHÁĆEK & BARBER (2013: Figs 122–128).

Fig. 1. Anthomyza dichroa sp. nov., male, general habitus (Canada: Ontario: Sault Ste. Marie, Bristol Place Park), body length ca. 2.5 mm. Based on photograph by J. Roháček.