Dolichomitus juglanse Sheng & Li, 2022

Sheng, Mao-Ling, Lü, Jun, Liao, Cheng-Jia, Li, Tao & Sun, Shu-Ping, 2022, Two species of Dolichomitus Smith, 1877 (Hymenoptera, Ichneumonidae, Pimplinae) parasitizing borers of Juglans mandshurica Maxim. and a key to species known from China, European Journal of Taxonomy 839, pp. 1-13 : 6-10

Dolichomitus juglanse Sheng & Li sp. nov.

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Figs 1–12

Diagnosis

Gena ( Fig. 3 ), vertex ( Fig. 4 ) and frons shiny. Median portion of vertex behind stemmaticum with correspondingly dense punctures. Malar space about 0.3 × as long as basal mandibular width. Postocellar line approximately 0.8 × as long as ocular-ocellar line. Flagellomeres elongate. Mesopleuron ( Fig. 6 ) with large posteromedian smooth shiny area. Fore femur weakly compressed, 4.0 × as long as maximum width; outer profile of middle tibia with sparse short tooth-like setae. Areolet pentagonal ( Fig. 10 ). Propodeum ( Fig. 7 ) in dorsal view slightly expanded medially; anterior 0.3 of lateromedian longitudinal carinae present. Second tergite 0.85 × as long as first tergite. Lower portions of anterior 2 ridges of lower valve of ovipositor ( Fig. 9 ) distinctly reclivous, posterior 2 slightly inclivous or subvertical. Mesosternum yellow brown or black.

Differential diagnosis

The new species is similar to D. nakamurai ( Uchida, 1928) , but can be distinguished from the latter by the postscutellum being shiny, transverse, with sparse fine punctures; the propodeum ( Fig. 7 ) almost as long as its maximum width, evenly expanded medially; tergite 2 ( Fig. 8 ) shorter than its maximum width; mesosternum ( Fig. 1 ) yellow brown or black; tegula dark-brown to brown; hind femur dark redbrown. Dolichomitus nakamurai (Figs 13–14): postscutellum matt, quadrate, with dense punctures; propodeum (Fig. 13) distinctly longer than maximum width, not expanded medially; tergite 2 (Fig. 14) 1.1–1.2 × as long as posterior width; mesosternum entirely black; tegula yellow; hind femur reddish brown.

Etymology

The specific epithet is derived from the host’s food plant.

Material examined

Holotype CHINA • ♀; Liaoning, Kuandian Manzu Autonomous County; 12 Mar. 2021; reared from Mesosa myops (Dalman, 1817) ; Jun Lü leg.; CBDPC.

Paratypes CHINA • 7 ♀♀, 27 ♂♂; Liaoning, Benxi Manzu Autonomous County; 30 Aug.–23 Sept. 2014; reared from Mesosa myops (Dalman) by Mao-Ling Sheng and Tao Li; CBDPC • 12 ♀♀, 159 ♂♂; same collection data as for holotype; 25 Dec. 2020 – 10 April 2021; CBDPC • 13 ♀♀, 87 ♂♂; same collection data as for preceding; 11 Dec. 2021 to 20 Jan. 2022; reared from Menesia flavotecta Heyden, 1886 ; Jun Lü leg.; CBDPC .

Description

Female

MEASUREMENTS. Body ( Fig. 1 ) length 8.0– 8.5 mm. Fore wing length 7.5–7.7 mm. Antenna length 6.5– 6.8 mm. Ovipositor sheath length 8.0– 8.5 mm.

HEAD. Inner orbits distinctly convergent ventrally, slightly concave near antennal sockets. Face ( Fig. 2 ) 1.3–1.4 × as wide as long, shiny, slightly convex, with correspondingly sparse, fine punctures and darkish brown setae, distance between punctures 1.5–4.0 × diameter of puncture; upper margin between antennae evenly concave, with median small tubercle. Clypeal sulcus distinct, with row of punctures. Clypeus 2.3–2.4 × as wide as long, unevenly shagreened, upper portion almost shiny. Mandible with uneven punctures and brown setae; upper tooth as long as lower tooth. Malar area granular. Malar space about 0.3 × as long as basal mandibular width. Gena ( Fig. 3 ), vertex ( Fig. 4 ) and frons shiny. Gena with sparse fine punctures, from eye margin to occipital carina convergent posteriorly. Median portion of vertex behind stemmaticum with correspondingly dense punctures. Postocellar line approximately 0.8 × as long as ocular-ocellar line. Antenna with 29–31 flagellomeres; flagellomeres elongate, penultimate almost quadrate. Ratio of length from first to fifth flagellomeres: 7.5:6.1:6.0:5.9:5.8. Occipital carina complete, joining hypostomal carina above base of mandible, approximately 0.5 × length to base of mandible.

MESOSOMA. Pronotum ( Figs 3 , 6 ) smooth, shiny; upper posterior portion with uneven fine punctures. Epomia distinct. Mesoscutum ( Fig. 5 ) almost shiny, with uneven punctures, distance between punctures 1.5–4.5 × diameter of puncture. Notauli distinct anteriorly. Scutoscutellar groove almost smooth, shiny, anterior side evenly oblique, posterior side steep. Scutellum slightly convex, with sculpture as mesoscutum. Anterior portion of postscutellum distinctly concave, posterior portion distinctly convex transversely. Mesopleuron ( Fig. 6 ) with large posteromedian smooth shiny area, remainder with sculpture as mesoscutum. Upper end of epicnemial carina reaching to 0.8 distance to subtegular ridge. Metapleuron obliquely convex, upper portion with distinct fine punctures, lower portion almost smooth, shiny. Fore femur weakly compressed, 4.0 × as long as maximum width; outer profile of middle tibia with sparse short thorns. Ratio of length of hind tarsomeres from first to fifth: 15.1:6.5:3.7:1.4:5.1. Wings ( Fig. 10 ) slightly gray, hyaline. Areolet distinctly pentagonal, 2rs-m 0.8 × as long as 3rs-m ( Fig. 10 ). Postnervulus intercepted distinctly below middle. Hind wing vein 1-cu 0.4 × as long as cu-a. Propodeum ( Fig. 7 ) as long as maximum width, evenly convex, median portion in dorsal view slightly expanded; with correspondingly dense punctures and brown setae; median longitudinal area smooth, shiny, posteromedian with indistinct irregular wrinkles; anterior 0.3 of lateromedian longitudinal carinae present. Propodeal spiracle short elliptic, 1.5 × as long as wide.

METASOMA ( Fig. 8 ). Tergite 1 approximately 1.2 × as long as posterior width, with dense punctures; anteromedian portion smooth, concave; latero-median carinae present along lateral margin of anteromedian concavity; spiracle small, circular, located approximately at anterior 0.3 of tergite 1. Tergite 2 approximately 0.85 × as long as tergite 1, 0.9 × as long as posterior width, with dense punctures, distance between punctures 0.1–1.5 × diameter of puncture; posterior margin smooth. Tergites 3–5 with distinct lateral tubercles ( Fig. 8 ). Tergite 3 0.6 × as long as posterior width, anterior portion with sculpture as tergite 2, subposteriorly finely punctate, posterior margin almost smooth. Anterior halves of tergites 4 and 5 with dense fine punctures, medially with irregular indistinct wrinkles. Dorsal lobe of lower valve of ovipositor with 4 distinct ridges, lower portions of anterior 2 distinctly reclivous, posterior 2 inclivous ( Fig. 9 ).

COLORATION ( Fig. 1 ). Black, except for following: apical margin of clypeus and median portion of mandible more or less dark brown. Maxillary palpi and labial palpi yellow-brown. Tegula darkishbrown to brown. Mesosternum brownish yellow. Fore leg except anterior profile and middle femur yellow-brown to brown. Middle tibia darkish brown, tarsomeres brownish black. Middle coxa, hind trochantellus, femur and basal portion of tibia more or less dark red-brown. Pterostigma yellow. Veins brownish black.

Male

Body ( Fig. 11 ) length 8.5–10.0 mm. Fore wing length 6.5–7.9 mm. Antenna with 29–33 flagellomeres. Apical portion of clypeus and median portion of mandible darkish brown. Tergite 1 approximately 1.5 × as long as posterior width. Tergite 2 approximately as long as posterior width. Tergites 3–4 almost shiny, with fine punctures, posterior margins smooth. Paramere ( Fig. 12 ) wide, median portion weakly sclerosis, posterior margin slightly reclivous. Flagellomeres brownish black. Anterior profiles of scape and pedicel, maxillary palpi, labial palpi, fore and middle coxae, all trochanters, base of hind tibia and base of hind first tarsomere whitish yellow. Mesosternum reddish brown to black. Posteromedian portion of pterostigma blackish brown. Veins brownish black. Otherwise similar to female.

Variation

The specimen reared from Mesosa myops (Dalman, 1817) in J. mandshurica Maxim. distributed in Benxi Manzu Autonomous County have a black mesosternum.

Hosts

Menesia flavotecta Heyden, 1886 and Mesosa myops (Cerambycidae) .

Host foodplant

Juglans mandshurica ( Juglandaceae DC. ).

Figures

Figs 1–3. Dolichomitus juglanse Sheng & Li sp. nov., ♀, holotype (CBDPC). 1. Habitus, lateral view. 2. Head, anterior view. 3. Head and pronotum, lateral view.

Figs 4–7. Dolichomitus juglanse Sheng & Li sp. nov., ♀, holotype (CBDPC). 4. Head, dorsal view.

Figs 8–12. Dolichomitus juglanse Sheng & Li sp. nov. 8–10. ♀, holotype (CBDPC). 8. Metasoma, dorsal view. 9. Apical portion of ovipositor, lateral view. 10. Fore wing. 11–12. ♂, paratype (CBDPC). 11. Habitus, lateral view. 12. Apical portion of metasoma, lateral view. 13–14. Dolichomitus nakamurai (Uchida, 1928), ♀ (CBDPC). 13. Propodeum, dorsal view. 14. Metasoma, dorsal view.