Exetastes tullu, 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 : 58-60

Exetastes tullu sp. nov.

urn:lsid:zoobank.org:act:22591EEF-C304-4EDD-A772-5D83166F7F16

Figs 3 , 4A

Etymology

The specific epithet ʻ tullu ʼ means ʻthinʼ in Quechua, noun in apposition.

Type material

Holotype PERU • ♀; Cusco Region, Wayquecha Biological Station ; 13.175° S, 71.581° W; 2692 m a.s.l.; 22 Oct. 2007; Malaise trap; C. Castillo leg.; MUSM.

Paratype PERU • 1 ♀; same collection data as for holotype; MUSM .

Description

Female (holotype)

MEASUREMENT. Fore wing length 8.2 mm.

HEAD. Clypeus, in profile, basally weakly convex, subapically slightly concave; 1.5 times as wide as high. Mandible with upper mandibular tooth as large as lower tooth, without subdivision; basally coriaceous and punctate, smooth on apical half. Malar space 0.6 times basal width of mandible. Face ( Fig. 3C ), frons, vertex ( Fig. 3B ), and gena finely granulate, matt, finely and somewhat indistinctly punctate. Face with weak median convexity. Gena, in lateral view, 0.4 times as long as compound eye. Antenna setaceous with 52 flagellomeres (paratype with 50 flagellomeres); ratio of length vs width from second to fourth flagellomeres: 3.6:3.0:2.9, ratio of those around 0.7 of way along flagellum: 1.5, subapical flagellomere: 1.2. Ocellar-ocular distance 1.9 times maximum diameter of lateral ocellus ( Fig. 3B ).

MESOSOMA. Mesosoma entirely granulate, matt, mostly finely and densely punctate. Epomia absent. Notaulus faint ( Fig. 3B ). Scutellum, in profile, pyramidal ( Fig. 4A ). Subalar prominence strongly raised, sharply rounded. Upper half of metapleuron convex, lower half concave, upper margin scrobiculate, with submetapleural carina moderately raised extending about 0.7 of length of pleuron. Propodeum ( Fig. 3D ) granulate, matt, mostly finely and densely punctate; pleural carina present anteriorly, absent posterior to spiracle. Fore tibia slender, unspecialized. Hind femur 7.9 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; abscissa of M between 2rs-m and 2m-cu shorter than abscissa of M between 2m-cu and 3rs-m; cu-a distal to base of Rs and M.

METASOMA. T1 ( Fig. 3B ) 4.1 times as long as posteriorly wide; with spiracle positioned in anterior 0.46; granulate, shiny, mostly finely and densely punctate. T2 1.8 times as long as posteriorly wide, granulate, shiny, mostly finely and densely punctate. Ovipositor sheath elongate and slim, with transverse striation on outer surface. Ovipositor ( Fig. 3A, E ) projecting beyond apex of subgenital plate by 1.0 times length of hind tibia; stout, compressed, decurved, with subapical notch.

COLOR. Coloration black ( Fig. 3A ), except for following which are marked with yellow: lower half of clypeus, mandibles (except teeth), facial orbit ( Fig. 3C ) reaching upwards to lower part of frons, malar space, anterior margin of pronotum, along with its posterior margin dorsally and posterodorsally ( Fig. 3D ), propleuron, mesoscutum anterolaterally, transverse median stripe on scutellum, anterior edge of mesopleuron, a mark at end of epicnemial carina, subalar prominence, mesepisternum, ventral part of fore coxa, fore and mid femur and tibia ventrally, mid coxa ventrodistally, anterior third of T1 ( Fig. 3B ), lateral edges and distal edge, T2–4, and sternite 1–5; and following parts which are brown ( Figs. 3A, 3E ): fore and mid femur dorsally and extreme, fore and mid femur, tibia dorsally, hind femur, hind tibia, tarsomere, and ovipositor.

Figures

Fig. 3. Exetastes tullu sp. nov. holotype, ♀ (MUSM). A. Habitus, in lateral view. B. Head, mesosoma and T1 in dorsal view. C. Face. D. Propodeum. E. 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).