Key to species of Hoplonannus (based on male specimens)

Hoplonannus brunneus was not included because only the female is known.

1. Posterior margin of mediotergite 7 with an elongate anteriorly curved process (Figs 3 A–B; 5A–B); right paramere curved (Figs 3A; 3D; 5A; 5D)...................................................................................... 2

- Mediotergite 7 without a process (Silveira et al. 2019, fig. 10); right paramere almost straight (Silveira et al. 2019, fig. 10)................................................................................. H. australis Silveira et al.

2. Anophoric process with widened basal portion and thin sickle-shaped distal portion (Emsley 1969, figs 141; 142A); right paramere with one or two elongate distal digitiform process (Emsley 1969, figs 141; 142)............................... 3

- Anophoric process not widened at base, distal part laterally bent (Figs 3A; 3E; 5A; 5E); right paramere with two small claw-like projections (Figs 3A; 3D; 5A; 5D)........................................................................ 4

3. Right paramere apically with two thin and elongate digitiform processes (Emsley 1969, fig. 141)...................................................................................................... H. paenebrunneus Emsley

- Right paramere apically with two short and rounded processes and one elongate digitiform process (Emsley 1969, fig. 142)...................................................................................... H. craneae Emsley

4. Anophoric process slender and apically bifid (Fig. 3A; 3E)......................................... H. bifidus sp.n.

- Anophoric process robust and not bifid apically (Fig. 5A, 5E)..................................... H. robustus sp.n.