Grzegorzekia, Edwards, 1941

Fitzgerald, Scott J., 2019, The Nearctic species of Grzegorzekia Edwards (Diptera: Mycetophilidae), Zootaxa 4623 (3), pp. 163-174 : 164

Key to the species of Grzegorzekia (female of G. bushyae unknown)

1 Abdominal tergites of both sexes with narrow pale posterior bands (as Fig. 1 ); male mid-tibial organ present (as Fig. 6 ); female sternite 8 longitudinally divided medially ( Figs. 11–12 ); (western Nearctic)....................................... 2

- Abdominal tergites without pale posterior bands, but tergites may sometimes have anterolateral pale areas on some or all of tergites 2–7; male mid-tibial organ absent; female sternite 8 undivided medially in known species (female of G. bushyae unknown) though may have an emargination posteromedially (as Fig. 10 ); (Palearctic, Holarctic)........................ 3

2 Male terminalia as in Figs. 3–5 ; cercus without a strong, black, spine-like seta; gonocoxal comb of black spine-like setae visible in dorsal view ( Fig. 5 ; com); gonocoxal lobe slender, elongate with apical setae ( Figs. 3–4 ; gc lb); female sternite 8 posteromedially lobate in ventral view ( Fig. 11 ); ( western Nearctic ).................................. .. G. kerri Fitzgerald n. sp .

- Male terminalia as in Figs. 7–9 ; cerci each with a single, strong, black spine-like seta; gonocoxal comb of black spine-like setae not visible in dorsal view; gonocoxal lobe short, cow-horn-like, without apical setae ( Figs. 7–9 ; gc lb); female sternite 8 without distinct posteromedian lobes in ventral view ( Fig. 12 ) (western Nearctic).................... G. quercus Fitzgerald n. sp.

3 In lateral view, gonocoxites (section II) with a single apical lobe bearing a comb of stout, black, spine-like setae (as in Fig. 4 ; gc II); female unknown; ( England, France).................................................. G. bushyae Chandler

- In lateral view, gonocoxites (section II) with two lobes, the anterior lobe bearing a comb of stout, black, spine-like setae (as in Chandler, 1999; Fig. 13 ); (Palearctic and Holarctic).......................................................... 4

4 Aedeagus slender, nearly parallel-sided, elongate, extending beyond apex of gonocoxites; female with sternite 8 not deeply emarginated medially, posterior edge medially lacking stout, black, spine-like setae (see Papp & Ševčík, 2007, Figs. 1–5 ); ( Hungary, Slovakia)............................................................. G. hungarica Papp & Ševčík

- Aedeagus triangular, shorter, not reaching apex of gonocoxites (see Chandler, 1999, Figs. 13 –14); female with sternite 8 posteromedially more deeply emarginated, with two patches of stout, black, spine-like setae (one patch on each side of the median emargination with each patch bearing 2–3 setae) as Fig. 10 ; (Holarctic)........................... G. collaris (Meigen)

Figures

FIGURE 1. Grzegorzekia kerri n. sp., holotype male, habitus. Scale bar = 5 mm.

FIGURE 2. Grzegorzekia kerri n. sp., wing. Scale bar = 1 mm.

FIGURES 3–6. Grzegorzekia kerri n. sp., 3–5. male terminalia. 3. Ventral view. Scale bar = 0.5 mm. 4. Lateral view. Scale bar = 0.5 mm. 5. Dorsal view. Scale bar = 0.5 mm. 6. Male mid-tibial sensory organ, dorsal view (anterior setae seen at left). Scale bar = 0.26 mm. Abbreviations: aed, aedeagus; aed g, aedeagal guide; cer, cerci; com, comb of spine-like-setae; gc I, gonocoxite section 1; gc II, gonocoxite section 2; gc III, gonocoxite section 3; gc lb, gonocoxal lobe; par, paramere; to, tibial organ; T9, tergite 9.

FIGURE 13. Typical habitat of G. kerri n. sp. and G. quercus n. sp. with mature Oregon White Oak (Benton Co., Corvallis, Oregon, USA); the holotype male of G. quercus n. sp. was found resting under the fallen, moss covered branch in the foreground (indicated by white arrow).

FIGURES 10–12. Female terminalia, ventral view. 10. G. collaris. Scale bar = 0.33 mm. 11. G. kerri n. sp. Scale bar = 0.5 mm. 12. G. quercus n. sp. Scale bar = 0.25 mm. Abbreviations: S8, sternite 8.

FIGURES 7–9. Grzegorzekia quercus n. sp., male terminalia. Scale bar = 0.5 mm. 7. Ventral view. 8. Lateral view. 9. Dorsal view. Abbreviations: aed, aedeagus; aed g, aedeagal guide; cer, cerci; com, comb of spine-like-setae; gc II, gonocoxite section 2; gc III, gonocoxite section 3; gc lb, gonocoxal lobe; par, paramere; T9, tergite 9.