Mimogonus clavicornis, 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 : 486-487

Mimogonus clavicornis sp. nov.

( Figs. 1 a-d, 6 A)

Type locality. Ecuador, Napo, 6.9 km E of Puerto Napo, 1°01.48ʹS, 77°43.58ʹW, 500 m a.s.l.

Type material. HOLOTYPE: J, ʻEcuador: Napo Prov., 6.9 km E of Puerto Napo (1°01.48ʹS, 77°43.58ʹW), 500 m elevation, 24.11.2006, leg. M.Fikáček & J. Skuhrovec, collected in primary forest with sparse understory vegetation, shady, sifting of leaf litter and rotten branches at various sites along the trailʼ ( QCAZ). PARATAYPES: 2 ♀♀, same data as holotype ( NMPC, UIC); 1 ♀, ʻNapo Prov., 33 km N Tena, 8-29 km E on Loreto Rd. XI-2-88, 1200-1500 m elevation, litter, leg. L. Hermanʼ ( AMNH).

Diagnosis. This species resembles M. curtus sp. nov. in shape and punctation. The aedeagus, also, shows no significant differences between the two species. Mimogonus clavicornis sp. nov. is smaller and darker in colour than M. curtus and the pronotal midline is distinct throughout its total length. Moreover, the antennae in M. clavicornis are more clavate than in. M. curtus , in particular the 6 th antennomere is short and at least twice as wide as it is long in M. clavicornis , while it is stouter and only slightly wider than it is long in M. curtus .

Description. Length: 2.2 mm. Colouration: dark red; legs and antennae pale red.

Head 0.25 mm long, 0.35 mm wide; eyes small, composed of 10 ommatidia; eyes not prominent; temples as long as eyes; setiferous punctation of disc dense and deep; setae long and yellow; setae as long as 3 times the diameter of punctures; distance between punctures less than ¼ as wide as diameter of punctures; surface between punctures polished, with weak net-like microsculpture; elevations at base of antennae without punctation and microsculpture, glossy.

Antennae longer than length of head and half of pronotal length combined; 2 nd antennomere globular; 3 rd conical and as long as short 2 nd antennomere; following antennomeres increasing in width; 4 th antennomere slightly wider than long; penultimate antennomeres between 1.5 and 2 times wider than long.

Pronotum 0.35 mm long, 0.52 mm wide; widest in the middle; without distinct anterior angles; posterior half with deep emargination; lateral margin denticulate, including posterior emargination; posterior angles with indistinct depression; setiferous punctation as dense as that of head, but slightly deeper and larger; distance between punctures less than half as wide as diameter of punctures; indistinct impunctate midline present; surface between punctures glossy.

Elytra 0.30 mm long, 0.50 mm wide; lateral margin deeply denticulate; setiferous punctation slightly weaker than that of pronotum and surface between punctures with weak microsculpture; less glossy than pronotum.

Abdomen with similar punctation as that of elytra; microsculpture of anterior abdominal segments more distinct than that of posterior segments; last visible abdominal tergite bifurcate.

Shape of aedeagus as in M. curtus ; paramere as long as apical part of median lobe; endophallus long and straight.

Etymology. The specific name refers to the thick and clavate shape of antennae and is a combination of the epithet clava, derived from the same Latin word meaning club, and cornu, meaning the antenna of beetles.

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).