Mimogonia species

Irmler, Ulrich, 2010, New species of the genera Mimogonus and Mimogonia (Coleoptera: Staphylinidae: Osoriinae) from the Neotropical Region, Acta Entomologica Musei Nationalis Pragae 50 (2), pp. 483-494 : 492-493

Key to Mimogonia species with large prominent eyes

(ratio between head width including eyes / pronotal width ≥ 0.90)

In all other Mimogonia species , head width / pronotum width ratios range between 0.74 and 0.86 because the eyes are smaller than in the species included in the following key.

1. Ratio of head width including eyes: width of pronotum ≥ 1.0 ( Figs. 6D–F , 7A ). ....... 2

– Ratio of head width including eyes: width of pronotum is 0.9 to 1.0 ( Fig. 7B ). ......... 6

2. Body smaller than 2.0 mm, elytra approximately as long as wide, ratio of elytral length: width 1.00 to 1.02; antennae shorter than combined length of head and pronotum, 2 nd antennomere globular ( French Guiana). .................................. M. elytrata Irmler, 2005

– Body longer than 2.0 mm, elytra longer than wide, ratio of elytral length: width between 1.09 to 1.12, antennae longer than combined length of head and pronotum, 2 nd antennomere distinctly longer than wide. .................................................................................. 3

3. Body smaller, 2.1–2.2 mm, elytra yellow with dark posterior edge; punctation of pronotum finer and sparser, with weak microsculpture ( Fig. 6D ); surface shiny ( eastern Amazon Valley , Pará). ................................................................................. M. longipes sp. nov .

– Body larger than 2.5 mm, elytra reddish or brown; punctation of pronotum dense and coarse, with dense and deep microsculpture ( Fig. 6F , 7A ); surface matt or slightly shiny. .................................................................................................................................. 4

4. Elytra distinctly longer than wide, pronotum and elytra with dense microsculpture ( Fig. 6F ), surface more matt (northern Peru, Loreto). ............. M. longoelytrata Irmler, 2005

– Elytra approximately as long as wide, head and pronotum with weaker microsculpture ( Figs. 7A,B ), surface slightly shiny (Central Amazon valley, Amazonas). ..................... .................................................................................................... M. amazonica sp. nov.

5. Pronotum yellow, punctation of elytra fine, microsculpture deep and dense; punctation nearly invisible in the deep microsculpture. ................................................................. 8

– Pronotum brown, punctation of elytra coarser, microsculpture dense and deep, but punctation distinctly visible. ................................................................................................. 7

6. Elytra dark brown with coarse punctation and deep and dense microsculpture; surface matt ( Central Amazon valley , Amazonas). ................................... M. adisi Irmler, 2007

– Elytra lighter reddish with distinct, but not coarse punctation; microsculpture weaker; surface slightly shiny ( Eastern Amazon valley , Pará). ............... M. paraensis sp. nov .

7. Very small species, body approximately 1.7 mm long, punctation of elytra extremely fine (Central Amazon valley, Amazonas). ............................. M. unicolor Irmler, 1981

– Larger species, body approximately 2.0 mm long, punctation of elytra fine, but clearly visible in the dense microsculpture (western Peru, Ucayali). .......................................... ............................................................................................. M. hanagarthi Irmler, 2007

Figures

Fig.6. Head and pronotum of Mimogonus and Mimogonia species showing the shape, surface, setation and proportion of eyes. A – Mimogonus clavicornis sp. nov.; B – Mimogonus curtus sp. nov.; C – Mimogonus fumator (Fauvel, 1889); D – Mimogonia longipes sp. nov.; E – Mimogonia elytrata Irmler, 2005; F – Mimogonia longoelytrata Irmler, 2005. Scale bar: 0.5 mm.

Fig. 7. Head, pronotum (A, B) and elytra (C, D) of Mimogonia species showing punctation and microsculpture. A, C – M. amazonica sp. nov.; B, D – M. paraensis sp. nov. Scale bar: 0.5 mm.