Idiolispa vivarii, Schwarz, 2023

Schwarz, Martin, 2023, Description of a new species of Idiolispa FÖRSTER (Hymenoptera, Ichneumonidae, Cryptinae) from Austria, Linzer biologische Beiträge 54 (2), pp. 663-667 : 663-665

Idiolispa vivarii nov.sp.

H o l o t y p e (♀): "A, Oberösterreich Grünau im Almtal, Tierpark, 8.6.2022 47°48‘29‘‘N, 13°56‘54‘‘E J. Schwarz", " Holotypus ", " Holotypus ♀ Idiolispa vivarii SCHWARZ des. Mart. Schwarz ‘22" (Biologiezentrum Linz). The holotype was collected in natural habitats in the zoo "Cumberland Wildpark Grünau".

This species is most similar to I. villosa SHENG (known only from China) (SHENG & SUPING 1999) and I. subalpina (SCHMIEDEKNECHT) (distributed in North and Central Europe) ( SCHWARZ 1988) in respect of the long setae on various parts of the body, but differs in the female sex by its antenna with 12 segments with long setae (only 3 segments in I. villosa SHENG , and none in I. subalpina (SCHMIEDEKNECHT)) and with distinctly more than 3 long setae on an antennal segment, and by its distinctly granulate and matt face without transverse ridges. The other two species have the face with transverse ridges on a lustrous or weakly granulated background. Idiolispa villosa SHENG has long setae on hind tibia, which are lacking in I. vivarii nov.sp. and in I. subalpina (SCHMIEDEKNECHT) . The latter has the metasoma with some long setae, the second and third tergites with scattered setae on a lustrous and smooth background. In contrast, I. vivarii nov.sp. has no long setae on the metasoma, and the second and third tergites with dense setae.

Female ( Fig. 1 ). Antenna with 28 (left antenna) and 29 segments respectively, third segment (without annellus) 1.9 times as long as wide and 0.9 times as long as fourth segment; basal 12 segments with long setae up to twice as long as diameter of antenna ( Fig. 2 ). Head including face, clypeus, mandible, temple, vertex and frons in addition to the normal setae with very long setae, which are longer than diameter of antenna. Face coriaceous and matt, with few indistinct punctures ( Fig. 3 ). Central convexity of face moderately distinct. Clypeus strongly convex, lustrous and partly weakly coriaceous and with few distinct punctures, lower margin sharp and distinctly convex. Mandible with upper tooth distinctly longer than lower tooth. Malar space 1.2 times as long as basal width of mandible. Temple lustrous with scattered fine punctures. Frons lustrous with upper half weakly coriaceous and with scattered fine punctures. Shortest distance between hind eye and ocellus (OOL) 1.3 times diameter of distance between hind ocelli (POL). Head behind the eyes weakly narrowed ( Fig. 4 ).

Lateral part of pronotum rugose and with some punctures above; epomia only weakly indicated. Mesoscutum with some long setae, mainly lustrous and with a smooth background, but anteriorly coriaceous and matt, mesoscutum with both fine and with coarse punctures; notaulus only weakly indicated ( Fig. 5 ). Scutellum with a smooth background and with long setae, apically short longitudinal ridges, lateral carina extending more than half length of scutellum. Mesopleuron with transverse striation and some punctures (mainly dorsally), background lustrous and partly very weakly coriaceous; speculum lustrous and with punctures. Mesopleuron and mesosternum with few long setae. Metapleuron distinctly rugose, without exceptional long setae.

Propodeum short, lustrous and with distinct rugosity, without long setae, both transverse carinae distinct, posterior transverse carina absent medially ( Fig. 6 ). Spiracle oval.

Coxae, trochanters, trochantelli and femora with long setae below, but hind femur with only few and less conspicuous long setae. Mid and hind coxae distinctly coriaceous dorsolaterally. Hind femur 5.0 times as long as wide. Fore wing with areolet weakly narrowed anteriorly; nervulus interstitial.

Metasoma with weak granulation and lustrous and without long setae. Postpetiolus with some very fine and scattered punctures. Second metasomal tergite evenly and densely setaceous ( Fig. 7 ). Ovipositor sheath about 0.5 times as long as hind tibia. Ovipositor without a distinct nodus, its tip without teeth ventrally ( Fig. 8 ).

Coloration: black. White are antennal segments 7-12 above, metasomal tergites 5-6 dorsoapically. Hind leg with tarsal segments 2-4 dorsally partly whitish. Orange are mandible before teeth narrowly, metasomal tergites 1-2 entirely and third tergite except wide hind margin, trochanters, femora narrowly basally, fore femur apically, tibiae and tarsi partly. Tarsi partly brownish. Pterostigma dark brown.

Body length: 6.8 mm.

Male unknown.

E t y m o l o g y: The species name "vivarii " is Latin and means "from the zoo", where the holotype was collected.

B i o l o g y: unknown. Several Idiolispa species have been reared from the egg sacs of spiders (e.g. SCHWARZ & SHAW 1998, YU et al. 2012).

Figures

Figs 1-3: Holotype (♀) of Idiolispa vivarii nov.sp.; habitus laterally (1), base of antenna dorsally (2), head in facial view (3).

Figs 4-8: Holotype (♀) of Idiolispa vivarii nov.sp.; head dorsally (4), mesoscutum (5), propodeum dorsally (6), second tergite of metasoma (7), ovipositor tip (8).