Mimogonus curtus, Irmler, 2010

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 : 484-486

Mimogonus curtus sp. nov.

( Figs. 2 a–c , 6 B )

Type locality. Ecuador, Tungurahua, 22.7 km E of Baños, 1417 m a.s.l.

Type material. HOLOTYPE: J, ‘ Ecuador: Tungurahua Prov., 22.7 km E. Baños, 4650 ft. elevation, 22.5. 1993, leg. L. Herman, #2737, collected in litter near stream’ ( AMNH) . PARATYPES: 1 J, 1 ♀, same data as holotype ( AMNH, UIC).

Diagnosis. This species is highly similar to M. clavicornis sp. nov. It is slightly larger and of yellow colouration ( M. clavicornis : dark red). In contrast to M. clavicornis , the pronotal midline is indistinct at the anterior and posterior edges. The aedeagus, including the endophallus, is quite similar, too. Antennae in M. curtus sp. nov. are less clavate than in M. clavicornis ; in particular the 6 th antennomere is only slightly wider than it is long, whereas it is at least twice as wide as it is long in M. clavicornis .

Description. Length: 2.6 mm. Colouration: dark-yellow; legs pale-yellow.

Head 0.25 mm long, 0.50 mm wide; eyes small, composed of 10 ommatidia; not prominent; temples as long as eyes; setiferous punctation dense and deep; setae long and yellow; approximately 3 times as long as the diameter of punctures; distance between punctures less than ¼ as wide as diameter of punctures; surface of disc between punctures polished and without microsculpture; only anterior part of clypeus with weak microsculpture, but surface nevertheless shiny.

Antennae short, stout, and longer than length of head and half of pronotal length combined; 2 nd antennomere globular; 3 rd antennomere conical and not longer than 2 nd; 4 th antennomere short and slightly smaller than proceeding antennomeres; twice as wide as long; following antennomeres larger and wider than antennomeres I–IV, and of subequal width; penultimate antennomere 1.5 times as wide as long.

Pronotum 0.47 mm long, 0.73 mm wide; widest in the middle; without distinct anterior angles; with deep emargination in front of posterior angles; posterior angles with indistinct depressions with same length as lateral emargination; lateral margin fine; setiferous punctation as on head and surface without microsculpture, glossy.

Elytra 0.37 mm long, 0.67 mm wide; with denticulate margin; setiferous punctation as on head; surface between punctures with weak isodiametric microsculpture, but nevertheless, shiny.

Abdomen with setiferous punctation as dense and as deep as that of elytra and pronotum except 6 th visible segment, where punctation is weaker and sparser than that of preceding segments.

Aedeagus with median lobe forming a more or less right angle apically; paramera reaching apex of median lobe; endophallus long and straight.

Etymology. The specific name derived from the Latin word meaning short and refers to the short elytra of the species.

Figures

Figs. 1–2. 1 – Mimogonus clavicornis sp. nov.; 2 – Mimogonus curtus sp. nov. (a – fore body; b – antenna; c – aedeagus in lateral aspect; d – metatarsus). Scale bars: 1 mm (a), 0.1 mm (b–d).

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.