Polypedilum (Asheum)

Pinho, Luiz Carlos & Silva, Fabio Laurindo Da, 2020, Description of two new species of Polypedilum (Asheum) and immature stages of Polypedilum (A.) curticaudatum (Diptera: Chironomidae), Zootaxa 4759 (2), pp. 179-190 : 180

Key to male adults of species of Polypedilum (Asheum)

1. Gonocoxite and gonostylus stout ( Fig. 3A )................................................................. 2

- Gonocoxite and gonostylus relatively slender ( Figs 1A and 2A )................................................. 3

2. Superior volsella distinctly boot shaped. Caribbean and U.S.A.................. Polypedilum (Asheum) beckae (Sublette)

- Superior volsella variable, with slightly to strongly concave apical outer margin, and hooked apical projection. South America.............................................................. Polypedilum (Asheum) curticaudatum Rempel

3. Superior volsella gently tapering to a non-sigmoidal and short apical projection ( Fig. 1B ). Brazil (Rondônia and Mato Grosso)..................................................................... Polypedilum (Asheum) sofiae sp. n.

- Superior volsella abruptly tapering to a sigmoidal and long apical projection ( Fig. 2B ). Brazil (Bahia)........................................................................................ Polypedilum (Asheum) mayrahu sp. n.

Figures

FIGURE 1. Polypedilum (Asheum) sofiae sp. n., adult male. A, tergite IX and dorsal aspect of left gonocoxite and gonostylus. B, hypopygium with tergite IX removed, left dorsal aspect, right ventral aspect.

FIGURE 2. Polypedilum (Asheum) mayrahu sp. n., adult male. A, tergite IX and dorsal aspect of left gonocoxite and gonostylus. B, hypopygium with tergite IX removed, left dorsal aspect, right ventral aspect.

FIGURE 3. Polypedilum (Asheum) curticaudatum Rempel, adult male (A–H) and Polypedilum (Asheum) beckae (Sublette, 1964), adult male (I–K). A, tergite IX and dorsal aspect of left gonocoxite and gonostylus. B, hypopygium with tergite IX removed, left dorsal aspect, right ventral aspect. C–H. Variation of superior volsella in P. curticaudatum [C and D, both from same specimen, Corumbá population; E, Fazzari population; F, Joaçaba population; G, Andaraí population; H, modified from Rempel (1939)]. I–K. Variation of superior volsella in P. beckae [I, modified from Cranston et al. (1989); J, Santo Domingo population; K, modified from Sublette (1964)]