Serratichneumon maculatus Sheng & Riedel, 2023

Sheng, Mao-Ling, Riedel, Matthias & Wang, Zhong, 2023, A new genus and species of Ichneumonini Latreille (Hymenoptera, Ichneumonidae, Ichneumoninae) from Oriental Region, European Journal of Taxonomy 910, pp. 14-24 : 17-23

Serratichneumon maculatus Sheng & Riedel gen. et sp. nov.

urn:lsid:zoobank.org:act:5D6E2E64-E998-4359-B6A1-66660E22FE36

Figs 1–17

Etymology

The name of the new species is based on the body with large white and red spots.

Material examined

Holotype

CHINA • ♀; Guangdong, Guangzhou, Nansha, Huangshanlu Forest Park ; 22°48′ N, 113°33′ E; 12– 80 m a.s.l.; 16 Apr. 2022; Mao-Ling Sheng and Ying Zhang leg.; CBDPC.

Paratypes

CHINA • 1 ♂; same collection data as for holotype; CBDPC • 1 ♂; Hongkong, Pat Sin Leng ; 22°29′08″ N, 114°11′15″ E; 140 m a.s.l.; 21 Mar.– 4 Apr. 2015; C. Barthélémy leg.; HKU.

VIETNAM • 3 ♀♀, 1 ♂; Viet Try nr Thanh Son, Thuong Cuu; 20°59′ N, 105°8′ E; 350–400 m a.s.l.; 11–16 Oct. 1999; Malaise traps; R. de Vries RMNH´99 leg.; RMNH • 1 ♂; same collection data as for preceding; 12–16 Oct. 1999; RMNH .

INDONESIA • 1 ♂; Sumatera Barat, Lahan basah, Andalas University, Padang ; 0.933° S, 100.455° E; 156 m a.s.l.; 23 Jan. 2016; H. Hamid leg.; S16036 , COI 658 (On) BOLD: ADE0927, INDOBIOSYS-CCDB26088-G02; ZSM • 1 ♂; same collection data as for preceding; 16 Jan. 2016; S16042 , COI 658 (On) BOLD: ADE0927, INDOBIOSYS-CCDB26088-C08; ZSM .

Description

Female

MEASUREMENTS. Body length 11.7–14.0 mm. Fore wing length 7.7–8.5 mm.

HEAD. Face ( Fig. 2 ) approximately 1.9× as wide as long, with dense punctures, distance between punctures 0.2–0.5× diameter of puncture; median and lower lateral portion slightly convex; upper margin with small median tubercle. Clypeus flat, approximately 2.3× as wide as long, with slightly widened and leaf-like lateral parts; basal portion densely and apical sparsely weakly punctate; apical margin slightly arched forward. Apical margin of labrum with dense yellowish-brown setae. Mandible ( Fig. 3 ) with two rather distinctly separated teeth, upper tooth much longer than lower tooth; lower tooth slightly bent inwards (by 30°). Malar space 0.8–0.9 × as long as width of mandibular base. Subocular sulcus present. Gena ( Figs 4–5 ) slightly and roundly narrowed behind eye, ca 0.5× as wide as eye; occiput strongly concave medially. Vertex ( Fig. 5 ) punctate; ocelli small, distance between lateral ocellus and eye 2.0× ocellar diameter, post-ocellar line approximately 1.25 × as long as ocular-ocellar line. Frons smooth ventrally, with some transverse rugae dorsally and a central longitudinal rim in front of anterior ocellus. Antenna with 44–46 flagellomeres, slightly lanceolate; ratio of length from first to fifth flagellomeres approximately: 10.7:8.6:7.6:7.3:7.1; first flagellomere 4.1× and second flagellomere 2.8× as long as wide; widest flagellomeres about square. Occipital carina reaching hypostomal carina close to mandibular base, hypostomal carina low.

MESOSOMA. Side of pronotum with coarse punctures and some striae ventrally. Epomia absent. Mesoscutum ( Fig. 6 ) shining, lateral margin between tegula and scutellum distinctly carina-shaped; with dense punctures, distance between punctures 0.2–1.0× diameter of puncture; notaulus pit-like impressed on frontal margin of mesoscutum. Scutellum slightly convex and slightly wider than long, weakly punctate, without lateral carina. Mesopleuron ( Fig. 7 ) rugose-punctate; sternaulus not impressed. Epicnemial carina low, dorsally reaching center of mesopleuron close to its frontal margin. Metapleuron rugose-punctate; juxtacoxal carina absent. Hind coxa finely rugulose-punctate, without scopa. Hind femur slender, 5.9× as long as wide. Hind tibia externally with several short denticular spurs. Ratio of length of hind tarsomeres from first to fifth: 14.0:6.2:4.5:3.0:4.6. Claws simple ( Fig. 9 ). Areolet ( Fig. 8 ) pentagonal, frontal distance between veins 2rs-m and 3rs-m 4× their diameter; vein 2m-cu reaching areolet distad its middle. Postnervulus intercepted about at lower 0.3. Hind wing vein M+CU straight; 1-cu 3.0× as long as cu-a. Propodeum ( Fig. 10 ) coarsely but indistinctly rugose-punctate, not gradually sloping but with distinct horizontal basal part and descending apical part; propodeal carinae almost entirely absent; spiracle slit-shaped.

METASOMA. Distinctly amblypygous. Postpetiolus ( Fig. 11 ) widened, 0.6× as long as maximum width; median field slightly elevated, without dorsal carina, coarsely punctate and with some fine aciculation. 2 nd tergite approximately 1.4× as long as anterior width, and 0.95 × as posterior width, with dense punctures, fine aciculation between gastrocoeli; gastrocoelus distinctly impressed, triangular, with some fine longitudinal ridges; thyridium oblique, ca 0.7–0.8 × as wide as the interval. 3 rd tergite parallel laterally, 0.7 × as long as width; with sculpture as 2 nd, 4 th and 5 th tergites with superficial punctures, shining; following tergites almost smooth. Hypopygium ( Figs 12–13 ) completely covering ovipositor, apical margin slightly rounded. Ovipositor sheath not surpassing metasomal apex.

COLORATION ( Fig. 1 ). Black, except for the following: maxillary and labial palpi gray-brown, basal portion blackish brown; ventral annulus on flagellomeres 9–13 (14), drop-shaped spot on frontal orbit, hind edge or upper margin of pronotum, subtegular ridge, scutellum and postscutellum, central spot on metapleuron and spot on central propodeum (apical part of area superomedia), often posterolateral marks on postpetiolus and on 2 nd tergite, often apical band of 3 rd tergite, sometimes apical spot on 4 th tergite, always apical bands on 5 th to 7 th tergites, frontal spots on fore and mid coxae and dorsal spot on hind coxa cream-yellow or ivory; mandible centrally and central spot on face (sometimes indistinct) reddish; 1 st and 2 nd tergites red, sometimes 2 nd tergite partly blackish basally and laterally; following tergites black. Wings hyaline, pterostigma yellowish or ochreous.

Male

MEASUREMENTS. Body length 12.5–13.0 mm. Fore wing length 11.5 mm.

HEAD. Antenna ( Fig. 14 ) with 45–46 flagellomeres; first flagellomere 1.8–2.0× as long as width; 2 nd flagellomeres onwards strongly serrate, without tyloids. Distance between lateral ocellus and compound eye 1.5 × ocellar diameter.

MESOSOMA. Scutellum moderately elevated, 1.2× as wide as long, without lateral carina. Anterior portion of latero-median longitudinal carina of propodeum present ( Fig. 15 ), or area superomedia incomplete, ovoid, 1.5× as long as wide; costula weak, reaching middle of area superomedia. Hind femur 4.7–5.5 × as long as wide. Areolet pentagonal, frontal distance between veins 2rs-m and 3rs-m 2–3 × their width.

METASOMA. 2 nd tergite ( Fig. 16 ) about as long as wide; thyridium wide, oblique, 1.3× as wide as the interval. 2 nd to 3 rd or 4 th sternites with central membranous folds. Apical margin of hypopygium ( Fig. 17 ) slightly rounded.

COLORATION. Black, except for following: stripes or rings on flagellomeres (14) 15–18, face except small median dark spot, clypeus, mandible except teeth, maxillary and labial palpi, frontal orbit up to lateral ocellus, gena and wide outer orbit, scape ventrally, collar and upper margin of pronotum, tegula, subtegular ridge, large spot on ventral mesopleuron, spot on metapleuron, scutellum, postscutellum, large mark of propodeum (covering apical half of area superomedia, basal half of area petiolaris and complete area posteroexterna), hind margin of postpetiolus, posterolateral spot on 2 nd tergite, apical bands of 3 rd to 7 th tergites (on 3 rd and 4 th tergites narrowed medially), fore and mid coxae frontally, hind coxa dorsally and apically yellow or cream-yellow. 1 st to 3 rd tergites red, following tergites black. Legs except coxae including hind femur and fore and mid tarsi red; hind tibia basally and apically narrowly infuscate, hind tarsus black. Pterostigma yellow. Otherwise as described for the female. In males from Indonesia, basal flagellum ± ochreous and head and mesosoma with some dark-reddish suffusion around yellow spots.

Figures

Figs 1–3. Serratichneumon maculatus Sheng & Riedel gen. et sp. nov., holotype, ♀ (CBDPC). 1. Habitus, lateral view. 2. Head, anterior view. 3. Mandibles.

Figs 4–7. Serratichneumon maculatus Sheng & Riedel gen. et sp. nov., holotype, ♀ (CBDPC). 4. Head, lateral view. 5. Head, dorsal view. 6. Mesoscutum and scutellum, dorsal view.7. Mesosoma, lateral view.

Figs 8–11. Serratichneumon maculatus Sheng & Riedel gen. et sp. nov., holotype, ♀ (CBDPC). 8. Fore wing. 9. Apical portion of hind leg, lateral view. 10. Propodeum. 11. Metasoma, dorsal view.

Figs 12–14. Serratichneumon maculatus Sheng & Riedel gen. et sp. nov.12–13. Holotype, ♀ (CBDPC). 12. Apical portion of metasoma, lateral view. 13. Apical portion of metasoma, ventral view.14. Paratype, ♂ (CBDPC), head, anterior view.

Figs 15–17. Serratichneumon maculatus Sheng & Riedel gen. et sp. nov., paratype, ♂ (CBDPC). 15. Propodeum. 16. Metasoma, dorsal view. 17. Apical portion of metasoma, ventral view.