Matskási István (szerk.): A Magyar Természettudományi Múzeum évkönyve 85. (Budapest 1993)

Zanetti, A.: Contribution to the knowledge on Eastern Palaearctic Eusphalerum Kraatz with descriptions of new species (Coeloptera, Staphylinidae: Omaliinae)

Eusphaierum mahunkai sp. n. (Figs 29-30,49-50) Material examined - Holotype, male, and paratypes (1 male and 3 females), labelled: Korea, Prov. Kengi, Bagyon san, Bagyon popo, about 27 km SW from Kaesong, 7 June 1970, Hung. Exp. I in Korea, No. 99, leg. Dr. S. MAHUNKA et Dr. H. STEINMANN (HNHM, Z). Korea, N. Pyongan Prov., Myohyang-san, No. 940, 23.V.1985, leg. A VOJNITS et L. ZOMBORI, 1 male and 4 females (HNHM); Maritime Prov., Khasan Distr., Kravtsovka, 7.VI.1972, leg. A. RASNITSYN, 2 males (RYV). Diagnosis - Eusphaierum related to E. nmdifrons (LUZE) from Central Asia, characterized by yellowish head, pronotum and elytra, punctation of pronotum fine, apex of elytra of females prolonged at suture as in Fig. 50. Aedeagus as in Figs 29-30, with only four hairs at apex of parameres and characteristic internal sac. Measurements of holotype - Width of head: 0.48 mm; length of head, from clypeus to neck: 0.25 mm; width of pronotum: 0.61 mm; length of pronotum: 0.40 mm; length of elytra, shoulder to apex: 0.99 mm; width of elytra 0.92 mm; length from clypeus to apex of elytra: 1.66 mm; total length, with partially retracted abdomen: 1.9 mm. Derivatio nominis- This species is dedicated to Dr. S. MAHUNKA, acarologist, deputy general director of the Hungarian Natural History Museum. Description of holotype - Head yellowish, paler in front, pronotum yellowish, elytra yellowish, paler than head and pronotum, abdomen brown with three apical segments brownish yellow, metasternum yellowish, legs yellowish, antennae yellowish, scarcely infuscate at apex. -Head transverse (width/length ratio = 1.9) with prominent eyes, infraorbital carina indistinct and very close to eye; punctation fine and sparse, distance between punctures wider than their diameter on average; interspaces rather bright, microsculpture evanescent with isodiametrical mesh; subantennal depressions and anteocellar pits not very deep, rather confluent in two shallow longitudinal grooves; without stripes at internal margin of eyes; antennae rather thin, 1st and 2st segment ovoid (2nd scarcely smaller than 1st), 3rd conical, lengthened, 4th to 6th a little longer than wide, 7th and 8th subsquare, 9th and 10th feebly transverse, 11th lengthened. Pronotum transverse (width/length ratio = 1.5), narrowed caudally, widest in the middle, lateral margins regularly rounded, fore angles feebly obtuse and rounded; punctation fine and sparse, the distance between punctures twice as wide than their diameter on average, microsculpture dense with isodiametrical mesh, surface feebly bright; pubescence scarcely visible; depressions near hind angles superficial. -Elytra wide, 2,4 times longer and 1.5 times wider than pronotum, dilated at apex and feebly projected at apex near suture (Fig. 49); surface bright with strong and rather dense punctation, the distance between punctures is lesser than their diameter on average; pubescence scarcely visible. - Abdomen rather bright, microsculpture with isodiametrical mesh, punctation fine and sparse, pubescence sparse; 8th sternite of male elevated in the middle along the hind margin. - Aedeagus (Figs 29-30) with parameres feebly dilated at apex with only four hairs; median lobe narrowed from base to apex, internal sac with characteristic lamellae. Sexual dimorphism- Female with yellowish abdomen, apex of elytra as in Fig. 50 (form of apical lobes rather variable). Middle tibiae straight. Variability - Size: 1.8 - 2.5 mm. Apex of elytra of female specimens more or less sinuous near apical lobe. Remarks - This species belongs to the E. fulvipenne-group inhabiting the Central Asian states of the late Soviet Union and Afghanistan (ZANETTI 1990). It is the only species from Palearctic Far East with only four hairs at apex of parameres (the record of E. torquatum from Japan (SHIBATA 1976) is to be considered uncertain). According to WATANABE (in litt.), no species from Japan is related to E. mahunkai because of the lack of projections at the suturai angles of elytra. Distribution - Eastern Siberia (Maritime Province) and North Korea (Kengi Province and North Pyongan Province).