Cymodusa culaiica Sheng, Li & Sun, 2021

Li, Tao, Chang, Guo-Bin, Yang, Zai-Hua, Sun, Shu-Ping, Tian, Yue & Sheng, Mao-Ling, 2021, Two new species of Cymodusa Holmgren (Hymenoptera, Ichneumonidae) with a key to species known from China and Oriental region, Journal of Hymenoptera Research 88, pp. 103-114 : 103

Cymodusa culaiica Sheng, Li & Sun sp.nov.

Figures 1-5 , 6-9

Diagnosis.

Head, mesosoma and all tergites coriaceous. Anterior tentorial pit obscure, against eye. Areolet sessile (Fig. 1 ). Nervellus not intercepted. Area basalis of propodeum (Fig. 7 ) elongate, 2.5-2.7 × as long as anterior width, 3.6 × as long as posterior width; lateromedian longitudinal carinae from base of area superomedia evenly strongly divergent posteriorly. Legs almost entirely yellowish brown. Posterior 0.5-0.8 of tergites 3 and 4 reddish brown.

Description.

Body length 4.0-5.0 mm. Fore wing length 2.2-2.5 mm. Ovipositor sheath 0.8-1.0 mm.

Head. Head with coriaceous surface. Eye (Figs 2-4 ) large. Median portion of inner margins of eyes (Fig. 2 ) slightly concave near antennal sockets. Eye with weak, short setae. Face and clypeus with dense gray white setae. Face strongly convergent ventrally, maximum width beneath antennal socket approximately 2.5 × as long as minimum width; sublateral portion of upper margin, beneath antennal socket, distinctly raised. Clypeus slightly convex medially, apical margin slightly convex forward. Anterior tentorial pit small, obscure, against eye. Mandible with fine indistinct punctures; lower tooth as long as upper tooth. Malar space very narrow, almost absent. Gena, vertex and frons (Figs 3 , 4 ) with dense gray setae. Gena strongly convergent backward. Posterior portion of vertex behind hind margin of stemmaticum steeply oblique. Stemmaticum raised. Postocellar line 1.1-1.2 × as long as ocular-ocellar line. Frons almost flat, lower portion with fine indistinct wrinkles. Antenna with 24-25 flagellomeres; ratio of length from first to fifth flagellomeres: 1.1:0.7:0.7:0.7:0.6. Occipital carina (Fig. 3 ) complete, dorsal portion evenly arched.

Mesosoma. Lateral concavity of pronotum (Figs 4 , 6 ) with dense strong oblique wrinkles; dorsoposterior portion rough, with short indistinct transverse wrinkles. Epomia present. Mesoscutum (Fig. 5 ) evenly convex. Notaulus indistinct. Scuto-scutellar groove with distinct longitudinal carinae. Scutellum slightly convex, with dense thin setae. Postscutellum strongly narrowed anteriorly, anterolaterally with small pit. Lower half of mesopleuron (Fig. 6 ) slightly convex, with short indistinct wrinkles; speculum slightly convex, relatively small, smooth, shiny. Epicnemial carina strong, upper end almost reaching front edge of mesopleuron, about 0.6 distance to subtegular ridge. Metapleuron evenly convex; juxtacoxal carina absent; submetapleural carina complete. Hind femur 5.0 × as long as its maximum width. Ratio of length of hind tarsomeres from first to fifth: 3.2:1.5:1.0:0.6:0.7. First tarsomere 2.2 × as long as length of longer spur. Claw small, weakly pectinate. Wings slightly gray, hyaline. Fore wing with vein 1cu-a almost opposite M&RS. Areolet sessile, receiving vein 2m-cu approximately 0.45 × distance from vein 2rs-m to 3rsm, 2rs-m slightly longer than 3rs-m; postnervulus intercepted almost at middle. Hind wing with basal portion of M+CU distinctly arched; nervellus not intercepted, almost vertical. Propodeum (Fig. 7 ) evenly convex, apical portion evenly oblique; area basalis separated from area superomedia by distinct carina, slightly convergent posteriorly, 2.5-2.7 × as long as anterior width, 3.6 × as long as posterior width; lateromedian longitudinal carinae from base of area superomedia evenly strongly divergent posteriorly; areas superomedia and petiolaris completely confluent, with short, indistinct transverse wrinkles; costula present. Propodeal spiracle small, circular.

Metasoma. First tergite (Fig. 8 ) 2.6-2.8 × as long as apical width, basal half smooth, shiny, apical half shagreened; postpetiole distinctly convex, subapical portion widened; spiracle small, located approximately at apical 0.3. Tergites 2-3 (Fig. 9 ) slightly rough, posterior portions with indistinct fine punctures. Second tergite elongate, slightly widened posteriorly, 1.7-1.8 × as long as posterior width. Third tergite with parallel sides, 1.0-1.1 × as long as posterior width. Tergites 4 to 5 widened posteriorly. Ovipositor sheath almost (0.98 ×) as long as hind tibia. Ovipositor compressed, with sharp dorsal notch.

Coloration (Fig. 1 ). Black, except for the following: ventral profile of base of antenna brownish. Mandible except teeth, maxillary palpi, labial palpi and tegula yellow. Legs yellowish brown, except fore and middle coxae and ventral profiles of trochanters brownish yellow; apical portion of hind tibia slightly black brown. Pterostigma and veins blackish brown. Metasomal tergites brownish black, posterior portions of tergites 1, 2, 6 and 7, posterior 0.5-0.8 of tergites 3 to 5 reddish brown.

Etymology.

The specific name is derived from the type locality.

Material examined.

Holotype: China • ♀; Shandong, Chashankou, Culaishan Natural Reserve, Tai’an; 2.VI.2018; IT by Tao Zhao . Paratypes: China • 13♀♀; same data as for holotype except 26.V.-9.VI.2018 .

Distribution.

China.

Differential diagnosis.

The new species is similar to C. orientalis Uchida, 1956, but can be distinguished easily from the preceding key.

Figures

Figures 1 - 5. Cymodusa culaiica Sheng, Li & Sun, sp. nov. Holotype. Female 1 habitus, lateral view 2 head, anterior view 3 head, dorsal view 4 head and pronotum, lateral view 5 mesoscutum and scutellum, dorsal view.

Figures 6 - 9. Cymodusa culaiica Sheng, Li & Sun, sp. nov. Holotype. Female 6 mesosoma, lateral view 7 propodeum, dorsal view 8 first tergite, dorsal view 9 postpetiole and tergites 2 and 3, dorsal view.