Monoctonus nervosus (Haliday 1833)

Čkrkić, Jelisaveta, Petrović, Andjeljko, Kocić, Korana, Kavallieratos, Nickolas G., Hebert, Paul D. N. & Tomanović, Željko, 2019, Review of the world Monoctonina Mackauer 1961 (Hymenoptera, Braconidae, Aphidiinae): key for their identification and descriptions of five new species, Zootaxa 4691 (4), pp. 359-385 : 376-377

Monoctonus nervosus (Haliday 1833)

( Figs 7g , 8g , 9g )

Aphidius (Monoctonus) nervosus Haliday 1833: 488

Material examined. Montenegro, Durmitor, Mali Međed , 16 VII 2000, 6 VII 1998, 2 females, 1 male, reared from Acyrthosiphon malvae (Mosley) on Salix retusa ; 17 VII 2000, 1 female, 2 males reared from Acyrthosiphon malvae on Salix retusa ; Czech Republic, Bohemia, Jablonec , 28 VIII 1959, 1 female reared from unknown plant and aphid host; Techobuz, 5 IX 2013, 1 female and 1 male reared from Impatientinum balsamines (Kaltenbach) on Impatiens noli tangere .

Female. Head. Eyes oval, medium sized, sparsely setose. Malar space equal to 0.2 of longitudinal eye diameter. Tentorial index 0.2. Clypeus oval with 9–10 setae. Maxillary palps with four palpomeres, labial palps with three palpomeres. Antenna with 15–16 antennomeres, filiform, setae on flagellomeres semierect, subequal to flagellomere diameter. Flagellomere 1 (F1) about 4 (3.4–4.3)× as long as wide, without longitudinal placodes. F2 about 3.4 (2.5–3.7)× as long as wide, with 1 longitudinal placode. F3, F4 and F5 with 2, 2–3 and 2–3 longitudinal placodes, respectively. F1 length equal to F2.

Mesosoma. Notaulices on mesoscutum sometimes absent, sometimes barely visible in anterior part. Dorsal surface of mesoscutum sparsely setose; sometimes with two longitudinal rows of setae. Head width/mesoscutum width ratio 1.3. Propodeum areolated, with moderatelly narrow central pentagonal areola ( Fig. 7g ).

Fore wing ( Fig. 8g ). Wing length about 2 (1.9–2.1) mm, width about 0.8 mm (0.6–1). Stigma narrow, about 6.4 (6.1–6.7)× as long as wide and about 2 (1.8–2.3)× as long as distal abscissa of R1. Veins m-cu and 2RS visible. Veins r and 3RS distinct.

Metasoma. Petiole 2.2× as long as wide at spiracles. Dorsal disc of petiole moderatelly rugose, with 8–9 long setae on each side. Ovipositor sheath distinctly ploughshare shaped. Ovipositor sheath length/width ratio about 2.7 (2.6–2.8) ( Fig. 9g ).

Colour. Head brown, eyes black, mouthparts light brown. Scapus light brown, pedicel, F1 and sometimes basal third of F2 yellow, remainder of antenna brown. Mesonotum, propodeum and legs brown. Wings hyaline with brown venation. Petiole and rest of metasoma brown, ovipositor sheath light brown. Body length 2.8 mm.

Male. Head. Eyes oval, medium sized, sparsely setose. Malar space equal to 0.3 of longitudinal eye diameter. Tentorial index 0.4. Clypeus oval with 6–10 setae. Maxillary palps with four palpomeres, labial palps with three palpomeres. Antenna with 17–19 antennomeres, filiform, setae on flagellomeres semierect, subequal to flagellomere diameter. Flagellomere 1 (F1) about 2.4 (2.3–2.5)× as long as wide, with 6–7 longitudinal placodes. F2 about 2.3 (2.1–2.5)× as long as wide, with 4–7 longitudinal placodes. F3, F4 and F5 with 4–5, 4–8 and 5–6 longitudinal placodes, respectively. F1 length equal to F2.

Mesosoma. Notaulices on mesoscutum sometimes absent, sometimes barely visible in anterior part. Dorsal surface of mesoscutum sparsely setose; sometimes with two longitudinal rows of setae. Head width/mesoscutum width ratio 1.3. Propodeum areolated, with narrow central pentagonal areola.

Fore wing. Wing length about 2.4 (2.1–2.5) mm, width about 0.9 (0.8–1) mm. Stigma narrow, about 6 (5.8– 6.2)× as long as wide and about 2.4 (2.2–2.7)× as long as distal abscissa of R1. Veins m-cu and 2RS visible. Veins r and 3RS distinct.

Metasoma. Petiole 2.2× as long as wide at spiracles. Dorsal disc of petiole moderately rugose, with 6–7 long setae on each side.

Colour. Head and antenna brown, mouthparts light brown. Mesonotum and propodeum brown, legs light brown. Wings hyaline with brown venation. Petiole and rest of metasoma brown. Body length 2.3 mm.

Hosts: Impatientinum balsamines on Impatiens noli-tangere ; Acyrthosiphon malvae on Salix retusa, Geranium caeruleatum.

Distribution. Palaearctic

Figures

FIGURE 7. Propodeum, females. a—F. pseudoplatani; b—H. angustivalva; c—M. caricis; d—M. crepidis; e—M. ligustri; f—M. mali; g—M. nervosus; h—M. paulensis.

FIGURE 8. Fore wing, females. a—F. pseudoplatani; b—H. angustivalva; c—M. caricis; d—M. crepidis; e—M. ligustri; f—M. mali; g—M. nervosus; h—M. paulensis.

FIGURE 9. Ovipositor sheaths. a—F. pseudoplatani; b—H. angustivalva; c—M. caricis; d—M. crepidis; e—M. ligustri; f—M. mali; g—M. nervosus; h—M. paulensis.