Leptogenonia Maruyama

Maruyama, Munetoshi, von Beeren, Christoph & Witte, Volker, 2010, Aleocharine rove beetles (Coleoptera, Staphylinidae) associated with Leptogenys Roger, 1861 (Hymenoptera, Formicidae) II. Two new genera and two new species associated with L. borneensis Wheeler, 1919, ZooKeys 59, pp. 61-72 : 67-68

Leptogenonia Maruyama gen. n.

Type species.

Leptogenonia roslii Maruyama, sp. n.

Etymology.

A combination of the host ant genus name Leptogenys and “-nia” that is the end of a lomechusine genus name Myrmedonia Erichson, 1837, in the same manner as Aenictonia Wasmann, 1900 which is associated with Aenictus ants.

Diagnosis.

This genus is similar to Maschwitzia Kistner, 1989 in body shape and punctation of body surface, but may easily be distinguished from it by the smaller body, the head with post-ocular ridges (Fig. 5: arrow), the temples being convex and the shorter legs. The head capsule structure is similar to those of Aenictonia and Anommatochara Wasmann, 1915 but is distinguished from those genera by the elytra without a pair of medial carinae.

Description.

Body (Fig. 4) elongate, flattened; surface of fore body rugose, matte.

Head (Figs 4, 5) transverse, depressed above, with post-ocular ridges (Fig. 5: arrow), widest at temples that are quite convex; occiput convex, with a pair of small tubercules; eyes large, less than 1/4 as long as head; clypeus truncate apically. Labrum weakly emarginate antero-medially, with 3 setae and 3 long setulae along anterior margin, sparsely with pseudopores around lateral areas. Mandibles (Figs 15-16) almost symmetric, gently curved, each apex acutely pointed; inner margin of right mandible (Fig. 16) with a small notch. Mentum (Fig. 17) trapezoidal, with several thick setae, very sparsely with pseudopores. Labium (Fig. 18) broad; prementum with a setal pore, in which seta is very long, and 2 real pores in its outer side, with several pseudopores around base of medial seta; apodeme without median projection, with lateral projection short, curved apically; ligula long, each lobe with 3 large setula; labial palpus with segment I long and apically dilated; segment II 4/3 as long as I, with membranous notch; segment III thin, narrowed apically, slightly as long as II.

Pronotum (Fig. 4) slightly convex, with a broad longitudinal groove medially, its lateral lines convex as a pair of carinae, sides well margined and elevated, depressed along margins. Mesocoxal cavity well margined; process of metaventrite narrow, rounded at apex.

Elytra (Fig. 4) apically widened, laterally with a pair of carinae; postero-inner margin of elytron obliquely truncate.

Legs (Fig. 4) moderate in length; femora slightly narrowed apically near apex; tibiae somewhat widened from around middle to basal 1/3, their bases constricted; tarsi somewhat thin.

Abdomen (Fig. 4) slightly expanded, widest around segment IV, well convex above; surface densely punctured, matte; segments II-IV emarginated posteromedially; segments III and IV with a pair of large depressions around base,. Median lobe of aedeagus (Fig. 22) with apical lobe covered by exposed inner sac which is fused with apical margin of aedeagus and well sclerotized. Paramere with apical lobe slightly widened apically.