Nanium atitlanensis Reshchikov & Sääksjärvi

Reshchikov, Alexey, Sääksjärvi, Ilari E. & Pollet, Marc, 2018, Review of the New World genus Nanium Townes, 1967 (Hymenoptera: Ichneumonidae: Ctenopelmatinae), with two new species from the Neotropical region, European Journal of Taxonomy 459, pp. 1-18: 13

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Nanium atitlanensis Reshchikov & Sääksjärvi

sp. nov.

Nanium atitlanensis Reshchikov & Sääksjärvi  sp. nov. 030443

Figs 1View Fig. 1, 8AView Fig. 8


This species can be distinguished from all its congeners by the combination of the following characters: face black, at most about as broad as high ( Fig. 1AView Fig. 1); pleural carina defined; metasoma with T1 relatively short (1.9 × as long as broad posteriorly) ( Fig. 1BView Fig. 1); hind leg with coxa, at least partly, yellowish ( Fig. 1CView Fig. 1).


The species name refers to the type locality (Volcán Atitlán).

Material examined

Holotype GUATEMALA: 1 ♀, Suchitepeq , 4 km S of Vol. Atitlán , 1590 m a.s.l. ± 7 m, 14.54852° N, 91.19331° W, wet cloud forest, MT, 14–18 Jun. 2009, sample code LLAMA #Ma-B- 09-2-01 ( ZMUTAbout ZMUT).GoogleMaps 


SEX. Female ( Fig. 1View Fig. 1).

BODY LENGTH. 4.5 mm.

HEAD. Antennal flagellum with 28 segments. Scape 1.6 × as long as wide. Head narrowed behind eyes, matte, rather square. Face as broad as eye height, convex, bulging, granulate ( Fig. 1AView Fig. 1). Clypeus separated from face by impression; clypeal apex strongly projecting anteriorly; apical margin of clypeus moderately obtuse, with a shallow notch; clypeal foveae small. Malar space 0.8 × as wide as basal mandible width; mandibular teeth of equal length and width.

MESOSOMA. Mesosoma granulate, not punctate, matte, bearing some pale setae ( Fig. 1CView Fig. 1). Notaulus absent. Epicnemial carina high, distinctly defined, almost reaching anterodorsal corner of mesopleuron. Mesopleuron matte, impunctate. Tarsal claws pectinate with small teeth at base. Fore wing without areolet; R intercepting pterostigma immediately behind its middle; 2 m-cu with a single bulla; cu-a intersticial. Hind wing with Cu 1& cu-a intercepted below middle; Cu 1 curved, not reaching edge of hind wing. Propodeal carinae absent except defined pleural carina ( Fig. 1CView Fig. 1).

METASOMA. Metasoma cylindrical, slightly shining, granulate, impunctate, with isolated setae ( Fig. 1BView Fig. 1).

First metasomal tergite 1.9 × as long as broad apically, with shallow median longitudinal impression

bordered by lateral longitudinal carinae. Hind margin of first metasomal sternite at level of spiracles. T2 transverse. Thyridia absent. Hypopygium triangular in profile. Ovipositor sheath slender, slightly wider

apically, 0.7 × as long as metasomal height.

COLOR. Head including face black. Clypeus and mandibles yellowish. Antenna black with scape and pedicel yellowish. Mesosoma black with pronotum yellowish ventrally; tegula yellowish. Fore and mid legs yellowish, hind leg black, with femur ventrally and coxa basally yellowish. Metasoma black, with epipleurae of T2 and T3 entirely yellowish. Pterostigma dark brown.


Guatemala (Sololá Department).


University of Tokyo, Department of Zoology