Mimogonia longipes, 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 : 487-488

Mimogonia longipes sp. nov.

( Figs. 3 a–c , 6 D )

Type locality. Brazil, Pará, 14 km S of Vijia.

Type material. HOLOTYPE: J, ʻBrazil: Pará: 14 km S. Vijia , May 30, 1973, leg. R.T. Schuh, collected in soil litter layer in “campo de caimbé”ʼ ( AMNH) . PARATYPES: 8 JJ 10 ♀♀, same data as in the holotype ( AMNH, UIC).

Diagnosis. This species can be easily distinguished from the other species of the genus by the extremely large and prominent eyes. The head width / pronotum width ratio is the greatest of all known Mimogonia species (1.18). The head thus resembles that of a small Stenus species. Large eyes are also found in M. elytrata Irmler, 2005 from French Guiana and M. longoelytrata Irmler, 2005 from Peru, but the head width / pronotum width ratios are smaller in these species, ranging only between 1.00 and 1.09. Furthermore, antennae of M. elytrata are shorter than length of the head and the pronotum combined, whereas they are longer than this distance in M. longoelytrata and M. longipes sp. nov. Hind legs of M. longipes are relatively longer than those of M. longoelytrata . The metatibia of M. longipes is distinctly longer than the length of the anterior three visible abdominal segments combined, whereas metatibia of M. longoelytrata is only as long as the length of the anterior three abdominal segments combined. The punctation of M. elytrata and M. longoelytrata is denser, in particular that of the head. Thus, the surface of the fore-body is matt in appearance in M. elytrata and M. longoelytrata , whereas it is shiny in M. longipes .

Description. Length: 2.2 mm. Colouration: yellow; head darker on disc than light yellow clypeus and pronotum also darker reddish than yellow anterior ⅔ of elytra; posterior third of elytra brown; 5 th and 6 th visible abdominal segments darker than proceeding yellow segments; legs and antennae yellow.

Head 0.30 mm long, 0.47 mm wide; eyes distinctly prominent and large; more than four times as long as short temples; sides in front of eyes strongly narrowed to anterior edge of clypeus; punctation irregular and with wide space in centre of disc impunctate; clypeus also without punctures; setiferous punctures large and deep; distance between punctures on average ¼ as wide as diameter of punctures; surface without microsculpture and shiny.

Antennae as long as length of head and pronotum combined; 2 nd antennomere longitudinally oval; longer than conical 3 rd antennomere; 4 th antennomere quadrate and as wide as preceding antennomere; following antennomeres wider and increasing in width; penultimate antennomere slightly wider than long.

Pronotum 0.35 mm long, 0.40 mm wide; lateral margins of anterior half parallel; deeply emarginate anterior to posterior angles; setiferous punctures dense and deep; distance between punctures on average half as wide as diameter of punctures; with wide longitudinal impunctate midline; surface without microsculpture, shiny.

Elytra 0.57 mm long, 0.50 mm wide; with large coriaceous setiferous punctation; surface with weak irregular microsculpture; surface matt.

Abdomen with setiferous punctation as deep and large as that of pronotum; with weak microsculpture; surface slightly shiny.

Legs long; tibiae slightly longer than length of anterior visibile 3 segments combined; mesotibia with long spines on outer edge and without emargination or comb on inner edge.

Median lobe of aedeagus with apical part forming a rectangular angle to the basal part; paramera as long as apical part of median lobe; endophallus with four torsions.

Etymology. The specific name longipes (Latin) is a noun in apposition and refers to the long legs of the species.

Figures

Figs. 3–5. 3 – Mimogonia longipes sp. nov.; 4 – Mimogonia amazonica sp. nov.; 5 – Mimogonia paraensis sp. nov. (a – fore body; b – antenna; c – aedeagus in lateral aspect; d – mesotarsus). 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.