Genus Leptotrema van Achterberg, 1988

Leptotrema van Achterberg, 1988: 42; Chen and Wu 1994: 94; Belokobylskij 1998 a: 219; Fischer 2002: 102; Yu et al. 2016.

Type species.

Aspilota dentifemur Stelfox, 1943, by original designation (Figs 22, 23).

Material examined.

( Leptotrema dentifemur) Denmark: • ♀, Stegelykke VG, 8–15. vii. 1991 (Munk leg.) (PFEC) . The Netherlands: • ♀, Putten (Gld.), Malaise trap, 26. ix – 2. x. 1973 (J. v. d. Vecht leg.) (RMNH) .

Diagnosis.

Mandible small, simple, tridentate, often with upper (first) tooth diminished with respect to lower (third) tooth. Paraclypeal fovea short, not reaching more than half distance between clypeus and inner margin of eyes. Mesoscutum with or without mesoscutal pit; notauli usually present only in anterior part of mesoscutum; precoxal sulcus usually present, propodeum with different types of sculpture and sometimes with longitudinal and / or transverse carinae, rarely entirely smooth. Fore femur has a distinct apomorphic character, viz., the presence of a large obtuse tooth (flange) or two or three small teeth. In fore wing, marginal cell never shortened; vein r originating from basal quarter of pterostigma; vein 2 - SR usually present and distinctly sclerotised; veins m-cu and cu-a postfurcal; first subdiscal cell always closed postero-apically by vein CU 1 a. Metasoma of ♀ more or less distinctly compressed laterally. Ovipositor sheath usually not longer than metasoma.

Remarks.

Only three rare Leptotrema species are known from the Palaearctic, Oriental and Australasian regions, L. bovefemora (Bhat, 1979), L. dentifemur (Stelfox, 1943) and L. wilhelmense Braet & van Achterberg, 2014 . Wharton (2002) treated Leptotrema only as subgenus of Dinotrema, but some other experts (Fischer 2002; Belokobylskij and Tobias 2007; Braet and van Achterberg 2014) preferred to consider it as a valid genus based on its unique apomorphic character: the presence of the ventral tooth or teeth of the fore tibia. The study based on the main morphological characters show that Leptotrema deserves generic status.