Nanium mairenai Gauld, 1997

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: 14-16

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Nanium mairenai Gauld, 1997


Nanium mairenai Gauld, 1997 


This species can be distinguished from all its congeners by the combination of the following characters: face at most about as broad as high, entirely yellow, pleural carina lacking, T1 slender (2.8–3.0 × as long as broad posteriorly); hind coxa, trochanter, femur and distal end of tibia black, trochantellus yellowish.


The type material was not examined.


Costa Rica.

Nanium medianum Reshchikov & Sääksjärvi  sp. nov.

Figs 5View Fig. 5, 8A– CView Fig. 8


This species can be distinguished from all its congeners by a combination of the following characters: face distinctly broader than high ( Fig. 5AView Fig. 5), mesosoma with yellow stripes on mesoscutum anteriorly ( Fig. 5CView Fig. 5), metasoma with all tergites extensively pale medially ( Figs 5B–CView Fig. 5).


The name of the species refers to the characteristic coloration of the metasoma.

Material examined

Holotype ECUADOR: 1 ♀, Podocarpus Parque Nacional, Cajanuma, trail Bosque Nublado (sampling site PR, Fig. 8B),  MT, 2750 m a.s.l., 16 Feb.–5 Mar. 2009, Marc Pollet and Anja De Braekeleer leg., sample code EC/2009-37/MP&ADB-013 (RBINS)  .

Paratype ECUADOR: 1 ♀, Podocarpus Parque Nacional, Cajanuma, trail Oso de Anteojos (sampling site S2 (YPT06-10), Fig. 8C),  2750 m a.s.l., 27 Feb.–5 Mar. 2009, YPT, Marc Pollet and Anja De Braekeleer leg., sample code EC/2009-37/MP&ADB-012 (RBINS). 


SEX. Female ( Fig. 5View Fig. 5).

BODY LENGTH. 4.7 mm.

HEAD. Antennal flagellum with 25 segments. Scape 1.6 × as long as wide. Head narrowed behind eyes, matte, roundish. Maximum length of temple 0.9 × transverse eye diameter, minimum length 0.6 × transverse eye diameter. Face width 1.1 × height of eye ( Fig. 5AView Fig. 5). Face convex, bulging, with granulate sculpture. Clypeus separated from face by impression; clypeal apex strongly projecting anteriorly; apical margin of clypeus moderately obtuse, without shallow notch; clypeal foveae small. Malar space nearly as wide as basal mandible width. Mandible teeth of equal length and width.

MESOSOMA. Mesosoma granulate, matte, impunctate, bearing scattered pale setae ( Fig. 5CView Fig. 5). Notaulus absent. Epicnemial carina high, distinctly defined, reaching pronotum. Mesopleuron matte, impunctate. Tarsal claws basally pectinate with small teeth. Fore wing without areolet; R intercepting pterostigma immediately behind its middle; 2 m-cu with a single bulla; cu-a postfurcal. Hind wing with Cu 1& cu-a intercepted below middle; Cu 1 straight, not reaching edge of hind wing. Propodeal and pleural carinae absent ( Fig. 5CView Fig. 5).

METASOMA. Metasoma cylindrical, rather shining, granulate, impunctate, with isolated setae ( Fig. 5BView Fig. 5). T1 1.5 × as long as wide apically, with shallow median longitudinal impression, and 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, 0.7 × as long as metasomal height.

COLOR. Body mostly dark-brown ( Fig. 5View Fig. 5). Clypeus, anterior lateral edges of mesonotum, fore and middle legs, hind coxa and femur ventrally, and medial part of metasomal tergites all yellowish-brown ( Fig. 5BView Fig. 5). Mandible yellow with brown apex. Palpus yellow ( Fig. 5CView Fig. 5).


Ecuador (Loja province).