Curtonotum anus (Meigen, 1830)

Kirk-Spriggs, Ashley H. & Wiegmann, Brian M., 2013, <p> <strong> A revision of Afrotropical Quasimodo flies (Diptera: Schizophora; Curtonotidae). Part IV — the continental Afrotropical species of <em> Curtonotum </ em> Macquart, with descriptions of thirteen new species and a combined phylogenetic analysis of the Curtonotidae </ strong> </ p>, Zootaxa 3684 (1), pp. 1-166 : 50

1.2.3. Curtonotum anus species-group

Species included: 6 (Nearctic / Palaearctic / Oriental).

Synapomorphy: Distiphallus with defined heavily sclerotised portion dorsally (41). Kirk-Spriggs and Freidberg (2007) tentatively proposed an anus species-group, based on i) a short robust phallus; ii) a distiphallus with a defined apical sclerotized portion; and iii) a spinose female cercus (pseudacanthophorite). To this group they ascribed the Palaearctic C. anus, Nearctic C. helvum and (tentatively) all 19 then known Neotropical species of Curtonotum . Characters defining an anus species-group were reassessed by Klymko and Marshall (2011) who redefined the species-group as follows: i) female cerci free from one another, but fused to tergite 10; ii) female cerci with specialized stout setae; and iii) female sternite 10 invaginate posteriorly, anteriorly with laterally compressed apodeme. The noted character states of the cercus are, however, synapomorphies of both the anus and platyphallum species-groups (as here defined).