Helictes magnus Scanavachi & Penteado-Dias, 2025

Scanavachi, Júlia & Penteado-Dias, Angélica Maria, 2025, New species of Helictes Haliday 1837 (Hymenoptera, Ichneumonidae, Orthocentrinae) from Chile, Zootaxa 5665 (1), pp. 121-129 : 122-125

Helictes magnus Scanavachi & Penteado-Dias sp. nov.

Holotype ( Figs 1–4. 7–13 ) ( MNNC) CHILE, ♀ “ Osorno , Chile , Parque Nacional Puyehue, Termas Aguas Calientes ‘’ S40°44’ W 72°19 ’’; alt. 440m; 14.I-03.II.2017; D. S. Amorim; Malaise trap . Paratypes: 1 ♂; same data as holotype ( MNNC) ; 1 ♀ same data as holotype, except DCBU 386929 , alt. 440 m, sweeping; 1 ♀ Provincia de Llanquihue , Chile, Vulcão Osorno, DCBU 385717, 322 m, sweeping; 1 ♀ Parque Nacional Puyehue , Chile , Osorno, Antillanca; 06.I.2020, DCBU 508758, 987 m, D. S. Amorim; Malaise trap.

Diagnosis. This species can be identified by the face black, tergite 2 brown with apex pale yellow, tergite 3 pale yellow, epomia, notaulus and subocular sulcus present, sternaulus very short and shallow, female flagellomeres 13–19 white. Fore wing with nervulus broken and hind wing with Cu1 strong.

Description of holotype ♀, body length 5.8 mm. Fore wing, length 5.0 mm. Hind wing length 1.2 mm ( Fig. 1 ).

Head. Head coriaceous with sparse setae, face width 1.3 × height, mandible twisted with two teeth visible; lower tooth shorter than upper tooth. Malar space 0.9 × basal width of mandible with subocular sulcus present; maxillary palp not so long. Inner eye orbits subparallel. Clypeus convex, coriaceous, apex width 0,8 × height, apical edge of clypeus truncate ( Fig. 2 ). Eye–ocellar distance 0.7 × diameter of lateral ocellus; occipital carina complete and upcurved ( Fig. 3 ). Scape very elongated; length of first flagellomere 3.6 × width, length of second flagellomere 2.8 × width; 24 flagellomeres.

Mesosoma. Pronotum coriaceous with epomia present. Mesopleuron coriaceous and pilose, epicnemial carina present, mesopleural fovea punctiform, mesopleural groove present to slightly coriaceous, sternaulus distinct, short and shallow, present only on anterior 0.3 of mesopleuron. Mesoscutum and scutellum coriaceous and densely pilose, notaulus deep, prescutellar groove coriaceous with transversal carina; scutellum with lateral carinae up to its apex ( Fig. 6 ). Propodeum coriaceous and pilose; carina pleural, median longitudinal carinae and posterior transverse carina present, without costula. Propodeal apophyses resulting from crossing median longitudinal carinae and anterior transverse carina developed ( Fig. 8 ).

Legs: Hind femur 1.38 × as long as wide. Hind tibia 8.1 × as long as wide, 1.1 × as long as hind tarsus. First segment of hind tarsus 1.7 × as long as second segment, a dense hair fringe on the apex of the hind tibia ( Fig. 7 ). Large claws and arolium present (arolium does not exceed the size of the claw).

Wings. Fore wing areolet absent; two bullae present on vein 2m-cu; Rs straight and extended to end of the wing; nervulus interstitial and broken ( Fig 9 ). Hind wing Cu1 present, one bulla present in intercubitella; nervellus reclivous intercepted by Cu1 below the middle ( Fig. 10 ).

Metasoma. First tergite length 3.0 × apical width. First and second tergites coriaceous, remainder polished; glymma absent ( Figs 11, 12 ). Ovipositor very short, 0.13 × length hind tibia ( Fig. 13 ).

Color. Face, scape, pedicel and flagellomeres dark brown with white spot white on apex of flagellomeres 13–19. Clypeus brown and mandibles yellow with apex of teeth brown; palpi light yellow; pronotum, mesopleuron, mesoscutum and scutellum brown, propodeum dark brown. Tegula brown. Darkened wings. Legs mostly light brown; hind leg black, dorsal tibia and all tarsomeres light brown. Metasomal tergite 1 dark brown, tergites 2 and 3 brown with apex pale yellow, remaining brown. Sternites whitish with light brown spots, ovipositor sheath pale yellow.

Male. Body length 6.0– 6.5 mm; tyloids on flagellomeres 5–7; mesopleuron and mesoscutum polished ( Figs 4, 5 ). Etymology. The name magnus refers to the large size of the individuals compared with the general siz e Orthocentrinae . Distribution. Osorno, Chile. Comments. This sp. nov. is very similar to Helictes erythrostoma , but differs in the white flagellomeres; the broken nervulus on the fore wing; the presence of Cu1 vein on the hind wing; and body size.

Figures

FIGURES 1–7. Helictes magnus sp. nov. (1–3, 6–13 holotype ♀, 4–5 paratype ♂). 1, habitus, lateral view. 2, head, anterior view. 3, head, posterior view. 4, 5, mesosoma male lateral view. 6, pronotum, dorsal view. 7, posterior tibia.

FIGURES 8–13. Helictes magnus sp. nov. (8–13 holotype ♀) 8, propodeum. 9, fore wing. 10, hind wing. 11, metasoma dorsal view. 12, first tergite 13, ovipositor.