Exetastes andensis, Reshchikov & Alvarado, 2022

Reshchikov, Alexey & Alvarado, Mabel, 2022, Two new species of Exetastes (Hymenoptera: Ichneumonidae: Banchinae) from the Peruvian Andes, European Journal of Taxonomy 806 (1), pp. 52-63 : 56-58

Exetastes andensis sp. nov.

urn:lsid:zoobank.org:act:F4191926-8B12-454B-B4D6-F1F0C43521E8

Figs 2 , 4B

Etymology

The specific name is the Latin adjective ʻ andensis ʼ and refers to this species’ Andean distribution.

Type material

Holotype PERU • ♀; Cusco Region, Wayquecha Biological Station, Andean Cloud Forest ; 13.17448° S, 71.58691° W; 2865 m a.s.l.; 21 Jul.–8 Aug. 2014; Malaise trap; J. Bergsten et al. leg.; MUSM.

Paratypes PERU • 1 ♀; same collection data as for holotype; MUSM • 1 ♀; same collection data as for holotype but 13.18333° S, 71.58691° W; 2865 m a.s.l.; MUSM • 1 ♀; same locality as for holotype but 13.183° S, 71.583° W; 2800 m a.s.l.; 11 Sep. 2007; sweep net; C. Castillo leg.; MUSM .

Description

Female (holotype)

MEASUREMENT. Fore wing length 12 mm.

HEAD. Clypeus, in profile, basally weakly convex, subapically slightly concave; 1.5 times as wide as high. Mandible ( Fig. 2D ) with upper tooth large, obliquely chisel-shaped, and weakly subdivided; basally coriaceous and punctate, smooth on apical third. Malar space 0.7 times basal width of mandible. Face, frons, vertex, and gena finely granulate, matt, finely and somewhat indistinctly punctate. Face ( Fig. 2D ) with weak median convexity. Gena, in lateral view, 0.4 times as long as compound eye.Antenna ( Fig. 2A ) setaceous with 46 flagellomeres; ratio of length vs width from second to fourth flagellomeres: 2.8:2.5:2.5, ratios of those around 0.7 of way along flagellum: 1.2, ratio of subapical flagellomere: 1.2. Ocellar-ocular distance 1.5 times maximum diameter of lateral ocellus ( Fig. 2B ).

MESOSOMA. Mesosoma entirely granulate, matt, mostly finely and densely punctate. Epomia and notaulus absent ( Fig. 2B ). Scutellum ( Fig. 4B ) pyramidal in profile. Subalar prominence strongly raised and sharply rounded. Metapleuron evenly convex, with submetapleural carina moderately raised, extending about 0.6 of length of pleuron. Propodeum ( Fig. 2E ) granulate, with reticulate sculpture; pleural carina absent anteriorly, strong posteriorly. Fore tibia slender, unspecialized. Hind femur 5.8 times as long as its maximum width in lateral view. Tarsal claw simple. Fore wing with 3rs-m meeting Rs without joining 2rs-m, enclosing an areolet that is narrowly truncate above, with abscissa of M between 2rs-m and 2m-cu as long as abscissa of M between 2m-cu and 3rs-m; cu-a more or less opposite base of Rs and M.

METASOMA. T1 2.8 times as long as posteriorly wide; with spiracle positioned in anterior 0.46; granulate, matt, mostly finely and densely punctate ( Fig. 2C ). T2 0.9 times as long as posteriorly wide; granulate, matt, mostly finely and densely punctate. Ovipositor sheath elongate and slim, with transverse striation on outer surface. Ovipositor ( Fig. 2F ) projecting beyond apex of subgenital plate by 0.8 times length of hind tibia; stout, compressed, decurved, with subapical notch.

COLOR. Coloration reddish-yellow ( Fig. 2A ), except for following which are marked with black: 15–46 th flagellomeres of antenna, teeth of mandibles, frons, groove between postscutellum and propodeum, groove between lower part of mesopleuron and metapleuron ( Figs 2E , 4B ), anteroventral part of hind coxa, dorsal part of fifth tarsomere of fore leg, dorsal parts of second to fifth tarsomeres of middle and hind legs, first sternite of metasoma, ventral edges of laterotergites of T2–3, anterolateral part of fifth sternite, anterolateral spots of T4, setae on T4–7, T8 entirely, cerci, ovipositor sheath except for pale apical tip, ovipositor; and following which are marked with bright yellow: 1 st –14 th flagellomeres of antenna, tip of ovipositor sheath ( Fig. 2F ); T4–7 and corresponding sternites which are white ( Fig. 2A ).

Variation

The paratype has the scuto-scutellar groove and anterior edge of T5–7 black.

Figures

Fig. 2. Exetastes andensis sp. nov., holotype, ♀ (MUSM). A. Habitus, in lateral view. B. Head, in dorsal view and mesoscutum. C. T1–2. D. Face. E. Propodeum. F. Ovipositor. B–F not to scale.

Fig. 4. Lateral view of scutellum. A. Exetastes tullu sp. nov. holotype, ♀ (MUSM). B. Exetastes andensis sp. nov. paratype, ♀ (MUSM).