Aclastus mantaricus, Bordera, Santiago & Mazon, Marina, 2015

Bordera, Santiago & Mazon, Marina, 2015, Description of a new species of Aclastus Förster (Hymenoptera: Ichneumonidae: Cryptinae) from the Peruvian Andes, with dimorphic females, Zootaxa 3955 (3), pp. 340-348 : 342-347

Aclastus mantaricus sp. nov.

( Figs 2 A–C, 3A–B, 4A–F, 5A–F)

Diagnosis: Winged females of Aclastus mantaricus sp. nov. can be distinguished from all other females of New World and European species by the combination of the following characters: metasomal tergites hairless dorsally ( Figs 5 E–F); malar space about 2.2–3.2 times the basal width of mandible and 0.8–0.9 times the width of clypeus ( Fig. 2 A); eyes at most 1.5 times the length of gena; antenna with 17–18 flagellomeres, first flagellomere 4.3–5.0 times as long as wide, length from third to fifth flagellomeres 7.0 times its maximum width ( Fig. 2 B); fore wing with abscissa of Cu 1 between 1 m-cu and Cu 1a shorter than Cu 1b; vein 2 m-cu present ( Fig. 5 A); postpetiole 1.0– 1.1 times as long as wide posteriorly; ovipositor relatively slender, nodus indistinct ( Fig. 2 C), ovipositor sheaths 0.9–1.3 times as long as first tergite; legs entirely light brown.

Brachypterous females can be distinguished from A. glabriventris Horstmann by the combination of the following characters: malar space 1.7–2.5 times as wide as basal width of mandible; antenna with 18 flagellomeres, length from third to fifth flagellomeres 7.5 times its maximum width, and from A. nigritus (Ashmead) by having all coxae orange (black in A. nigritus ).

Description. Winged female: Body length (without ovipositor) 2.6 mm ( Fig. 3 A). Head 0.3 mm long and 0.6 mm wide (from above). Mesosoma 0.4 mm long, 0.4 mm wide (mesoscutum without scutellum). Fore wing 2.5 mm. First tergite 0.4 mm long. Ovipositor sheaths 0.5 mm.

Head ( Figs 2 A–B, 4A). Transverse, 1.9–2.0 times as wide as long, barely constricted behind eyes, rounded ( Fig. 4 A). Gena 0.3–0.4 times as long as eye (viewed from above in a right angle). Frons barely convex, slightly flat just behind antennal sockets. Vertex, face and frons finely punctate (setiferous punctures) on a smooth and shiny background, denser on face, hairs white. Malar space long, 2.2–3.2 times as wide as basal width of mandible ( Fig. 2 A). Antenna with 17–18 flagellomeres; first flagellomere 4.3–5.0 times as long as wide, second one 3.3–3.9 times, length from third to fifth flagellomeres 7.0 times its maximum width ( Fig. 2 B). Genal carina joining hypostomal carina far behind base of mandible, at a distance slightly greater than basal width of mandible. Hind ocelli separated from eye by 1.6–1.9 times their diameter. Space between hind ocelli 1.3–1.5 times as long as their diameter. Occipital carina complete, situated far from ocelli ( Fig. 4 A).

Mesosoma ( Figs 4 A, C, E, 5A). Pronotum smooth and polished, only a few setiferous punctures in its upper hind corner. Epomia distinct, short. Mesoscutum as wide as long, nearly round, and strongly convex; finely punctate on a shiny background. Notaulus present, ending at approximately half length of mesoscutum. Scutoscutellar groove wide, smooth, without longitudinal wrinkles. Scutellum convex, same sculpture as mesoscutum, not delimited by a strong carina ( Fig. 4 A). Mesopleuron mostly smooth and shiny, finely punctate on upper edge and convex area just below sternaulus, which is clearly distinct and reaches, at least, half width of mesopleuron. Epicnemial carina distinct, reaching propleura on its upper third, upper part slightly diverging from it. Mesopleural fovea deep, mesopleural suture absent ( Fig. 4 C). Metapleuron smooth and shiny, with sparse and fine setiferous punctures, with irregular wrinkles in its lower part, beside hind coxa; metapleural fovea absent; propodeum with transverse and longitudinal carinae, sometimes longitudinal carinae are faintly developed, area superomedia transverse; mostly smooth and shiny, with some granulate areas, specially adjacent to carinae; propodeal spiracle small, rounded, not touching dorsal nor pleural carinae, but connected to latter by a short carina ( Fig. 4 E). Hind femur 5.7–6.5 times as long as high. Hind tibia 8.3–8.6 times longer than wide; tibial spurs nearly same length.

Wings ( Fig. 5 A). Ramulus absent. Vein 3 rs-m absent, thus areolet open. Vein 2 m-cu slightly inclivous, reaching areolet at a distance from 2 rs-m approximately equal to its length, with a single bulla occupying approximately its upper half, lower half not completely pigmented. M absent beyond areolet. Cu-a interstitial to Rs & M. Cu 1a reaching Cu 1b slightly above its middle, Cu 1b barely reclivous, distinctly angular, Cu 1a not complete until end of wing. Cu-a in hind wing not intercepted, Cu 1 absent; M + Cu strongly curved in its distal half.

Metasoma ( Figs 2 C, 5C, E). First metasomal tergite 1.8–2.2 times as long as wide. Lateral longitudinal carinae absent or indistinct; spiracle situated at apical 0.4 of first tergite ( Fig. 5 C). Tergites 2–8 transverse, second one 0.7–0.9 times as long as wide. First tergite strongly granulate and faintly aciculate; other tergites smooth and polished; tergites 2–5 with few sparse hairs, 6–7 more or less hairy ( Fig. 5 E). Ovipositor slightly and uniformly upcurved, nodus indistinct, without teeth, apex gradually pointed ( Fig. 2 C). Ovipositor sheaths 0.9–1.3 times as long as first tergite.

Colouration ( Fig. 3 A). Body dark brown to black. Antennae brownish. Legs and mandibles light brown. Anterior part of tergite II and basal part of tergite III light brown, sometimes tergite II entirely light brown.

Brachypterous female: Body length (without ovipositor) 2.4 mm ( Fig. 3 B). Head 0.3 mm long and 0.5 mm wide (from above). Mesosoma 0.3 mm long, 0.3 mm wide (mesoscutum without scutellum). Fore wing 1.2 mm. First tergite 0.4 mm long. Ovipositor sheath 0.5 mm.

Head ( Fig. 4 B). Transverse, 1.6–1.8 times as wide as long ( Fig. 4 B). Malar space 1.7–2.5 times as wide as basal width of mandible. Clypeus only slightly convex. Antenna with 18 flagellomeres; first flagellomere 5.3–6.2 times as long as wide, second one 3.5–4.5 times; length from third to fifth flagellomere 7.5 times its maximum width. Hind ocelli separated from eye by 1.7–2.2 times their diameter. Space between hind ocelli 1.7–2.4 times as long as their diameter ( Fig. 4 B).

Mesosoma ( Figs 4 B, D, F, 5B). Pronotum smooth and polished, only a few setiferous punctures in its upper hind corner ( Fig. 4 D). Epomia distinct, short. Mesoscutum very sparsely and finely punctate on a shiny background ( Fig. 4 B). Propodeum mostly smooth and shiny, with some granulate areas adjacent to the carinae, more extensive than in winged female; area superomedia slightly longitudinal ( Fig. 4 F). Hind femur 5.9–7.1 times as long as high. Hind tibia 8.0–9.0 times longer than wide.

Metasoma ( Figs 5 D, F). First metasomal tergite ( Fig. 5 D) 1.8–1.9 times as long as wide. Tergites 2–8 transverse, second one 0.6–0.7 times as long as wide ( Fig. 5 F). Ovipositor sheaths 1.1–1.2 times as long as first tergite.

Other features and coloration as in winged female.

MALE: unknown.

Etymology. The specific name refers to the Mesoandean basin of the Mantaro River, where the material was collected.

Type material. Holotype, PERU: 1 winged ♀, Ingenio (Junin), 10–24.VIII.2008, Malaise trap 1, leg. AECID A/013484/07 ( UNALM currently on loan to CEUA).

Paratypes: 1 winged ♀ Ingenio (Huancayo), 01–15.VI.2008, Malaise trap 3, leg. AECID A/013484/07 ( CEUA); 1 winged ♀, same locality, 10–24.VIII.2008, Malaise trap 3, leg. AECID A/013484/07 ( UNALM currently on loan to CEUA); 2 winged ♀♀ 16–30.XI.2008, Malaise trap 3 and 4, leg. AECID A/013484/07 ( CEUA); 1 winged ♀, same locality, 30.XI–14.XII.2008, Malaise trap 3, leg. AECID A/013484/07 ( CEUA); 1 winged ♀ same locality, 15–28.XII.2008, Malaise trap 4, leg. AECID A/013484/07 ( UNALM currently on loan to CEUA); 1 brachypterous ♀ same locality, 27.XII.2008 – 11.I.2009, Malaise trap 1, leg. AECID A/013484/07 ( UNALM currently on loan to CEUA); 4 brachypterous ♀♀ same locality, 08–22.II.2009, Malaise trap 3, leg. AECID A/013484/07 ( CEUA).

Hosts. Unknown.

Figures

FIGURE 2. Morphology of Aclastus mantaricus sp. nov.: A—face in frontal view; B—flagellum; C—ovipositor.

FIGURE 3. Habitus of Aclastus mantaricus sp. nov.: A—winged female (holotype); B—brachypterous female.

FIGURE 4. Morphology of Aclastus mantaricus sp. nov. A, C, E: winged female: A—head and mesoscutum, dorsal view; Cmesosoma, lateral view; E—propodeum and first metasomal tergite, dorsal view. B, D, F: brachypterous female: B—head and mesoscutum in dorsal view; D—mesosoma, lateral view; F—propodeum and first metasomal tergite in dorsal view.

FIGURE 5. Morphology of Aclastus mantaricus sp. nov. A, C, E: winged female: A—wings; C—first metasomal tergite in lateral view; E—metasoma, dorsal view. B, D, F: brachypterous female: B—wings; D—first metasomal tergite, lateral view; F—metasoma, dorsal view.