Mimogonia adisi, Irmler, Ulrich, 2007

Irmler, Ulrich, 2007, The genus Mimogonia (Coleoptera: Staphylinidae: Osoriinae) from the Neotropical region with descriptions of four new species, Zootaxa 1651, pp. 57-64 : 58-59

Mimogonia adisi n.sp.

Figs. 1 A–D, 5A

Type material. Holotype, male: BRAZIL: Amazonas, Ilha Marchanteria (Rio Solimoes), 59°58’W, 3°15’S, Varzea, 0 1.10.1981, leg. J. Adis, #50B, collected by tree eclector ( INPA). Paratypes: BRAZIL: 1 female, 0 1.10.1981, leg. J. Adis, # E12, collected by floor eclector, 1 female, 20.01.1982, leg. J. Adis, collected by heat extraction of floor litter; 1 male, Amazonas, Manaus 15 km SW, Ilha Marchanteria, 59°58’W, 3°15’S, inundation forest, 14.08.1981, leg J. Adis, # 50B ( INPA, UIC).

Diagnosis. The new species resembles M. subopaca in the dark body colour and the shape of the male mesotibia. Without examination of the inner structure of the aedeagus, a separation of the two species is difficult. In M. subopaca , the pronotum seems to be slightly lighter compared to head and elytra, while in M. adisi , the colour of the forebody is darker than in any other Mimogonia species presently known. However, the shape of the aedeagus of M. adisi is totally different from that of M. subopaca : in M. adisi the apex is more or less straight, while it is hook-like in M. subopaca .

Description. Body length 2.2 mm.

Body c olour black, legs and antennae yellow.

Head 0.25 mm long, 0.40 mm wide; prominent eyes nearly twice as long as temples; setiferous punctation dense and coarse, restricted to the clypeus and a supraocular region, disc without punctures; distance between punctures less than half as wide as diameter of punctures; microsculpture weak, reticulate, surface matt.

Antennae with 2nd antennomere as long as 1st and 1.5 times as long as conical 3rd antennomere, the following antennomeres wider than long and increasing in width, penultimate antennomeres 3 times as wide as long ( Fig. 1 B).

Pronotum 0.37 mm long, 0.42 mm wide; sides in front of posterior emargination slightly narrowed to the anterior angles, setiferous punctation as dense as on head, with wide impunctate midline, setae pointing to the middle, reticulate microsculpture dense and deep, surface matt, on each side of the smooth midline in front of posterior edge with indistinct depression.

Elytra 0.50 mm long, 0.47 mm wide; with coarse and nearly coriaceous setiferous punctation ( Fig. 5 A), even denser and coarser than on pronotum, but microsculpture weaker than on pronotum, thus surface slightly more glossy. Abdomen with weaker but equally dense setiferous punctation as on forebody, microsculpture dense and reticulate, surface matt.

Middle tibia of male widest near the middle, slightly narrowed to the apex, at inner side with a comb of long setae, posterior side densely covered with setiferous punctures ( Fig. 1 C).

Aedeagus with a short hook-like structure at apex and a row of granula at the inner side ( Fig. 1 D).

Etymology. The species is named in honour of Prof. Joachim Adis, Plön, who collected the species during his studies in the Amazon inundation forests.

Figures

FIGURE 5. Surface of elytra of Mimogonia. A: M. adisi, B: M. hanagarthi, C: M. hermani, D: M. huggerti. Scale bar: 0.25 mm.

FIGURES 1 – 3. Details of Mimogonia. 1: M. adisi, 2: M. hermani, 3: M. hanagarthi; A: forebody, B: antenna, C: male right mesotibia in dorsal aspect, D: aedeagus. Scale bar A: 1 mm, B – D: 0.1 mm.