Xorides kuandianense Sheng, Broad & Sun, 2023

Sun, Shu-Ping, Lü, Jun, Broad, Gavin R., Li, Tao & Sheng, Mao-Ling, 2023, Two new species of Xorides Latreille (Hymenoptera, Ichneumonidae) from China, with notes on biology and a key to species known from China, European Journal of Taxonomy 890 (1), pp. 115-135 : 128-132

Xorides kuandianense Sheng, Broad & Sun sp. nov.

urn:lsid:zoobank.org:act:27CB5FB4-A3E1-4809-B9EC-E65D1FCE7AD9

Figs 20–30

Diagnosis

Fore wing length 6.0 mm. Ovipositor sheath length 6.4 mm. Postocellar line approximately 0.9× as long as ocular-ocellar line. Antenna with 21 flagellomeres, apical portion stout, distinctly thicker than basal flagellomeres; flagellomeres 17–19 ( Figs 20 , 25 ) with “peg-like bristles”. Metapleuron strongly reticulate. Juxtacoxal carina absent. Ventral profiles of fore and mid tibiae slightly incurved, subbasally with angled concavities. Propodeum ( Fig. 28 ) entirely coarsely reticulate. Area superomedia with irregular wrinkles. First tergite ( Fig. 29 ) strongly irregularly wrinkled, 1.7 × as long as posterior width. Tergite 2 ( Fig. 29 ) rectangular, 0.7× as long as posterior width. Tergite 3 ( Fig. 29 ) with sides distinctly convergent posteriorly. Tergite 7 with indistinct fine transverse aciculae, posterior margin slightly concave medially. Head, mesosoma and metasoma almost entirely black.

Etymology

The name of the new species is based on the type locality.

Material examined

Holotype CHINA • ♀; Liaoning Province, Kuandian Manzu Autonomous County; 17 May 2017; Tao Li leg.; CBDPC.

Description

Female

MEASUREMENTS. Body ( Fig. 20 ) length approximately 7.8 mm. Fore wing length approximately 6.0 mm. Ovipositor sheath length approximately 6.4 mm.

HEAD. Face ( Fig. 21 ) approximately 2.2× as wide as long, slightly evenly convex, median portion with irregular coalescent punctures verging on rugulose-punctate; laterally shiny with distinct punctures; upper margin with strong median projection between antennal sockets. Clypeal suture thin, median portion between anterior tentorial pits almost straight. Clypeus small, almost semicircular, with slightly arched sub-basal transverse ridge; lower portion weakly inclined, depressed, with indistinct punctures. Basal portion of mandible with fine wrinkles. Subocular sulcus distinct. Malar space almost shiny, 0.9× as long as basal width of mandible, with shallow sparse punctures. Gena ( Fig. 22 ) shiny, with uneven punctures, lower portion with oblique longitudinal wrinkles. Vertex ( Fig. 23 ) shiny, with uneven punctures. Stemmaticum densely punctate. Postocellar line approximately 0.9 × as long as ocular-ocellar line. Frons ( Fig. 24 ) almost flat, upper portion with dense indistinct punctures, lower portion with dense transverse wrinkles. Antenna with 21 flagellomeres, apical portion distinctly stout; ratio of length from first to fifth flagellomeres: 1.0:1.2:1.4:1.3:1.2; flagellomeres 17–19 ( Figs 20 , 25 ) with “peg-like bristles”. Occipital carina complete, joining hypostomal carina far above base of mandible.

MESOSOMA. Anterior margin of pronotum ( Fig. 27 ) with fine oblique reticulate-punctation; lateral concavity shallow, with transverse wrinkles; posterior portion with large irregular punctures. Epomia strong, dorsal end tooth-shaped. Posteromedian portion of mesoscutum ( Fig. 26 ) with irregular transverse indistinct wrinkles, anteriorly and laterally with distinct punctures. Scutellum with uneven punctures, anteromedian portion slightly convex; almost flat, with irregular punctures. Metanotum transversely convex, anterior portion obliquely concave. Mesopleuron ( Fig. 27 ) almost shining, with indistinct oblique longitudinal wrinkles, interspaces with indistinct fine punctures; speculum present, relatively large; mesopleural fovea indistinct. Posterior transverse carina of mesosternum weak, almost complete. Metapleuron rough, strongly reticulate. Juxtacoxal carina absent. Submetapleural carina complete. Ventral profiles of fore and mid tibiae slightly incurved, sub-basally with angled concavities. Ratio of length of hind tarsomeres from first to fifth approximately: 7.0:2.8:1.7:1.0:2.6. Wings slightly brown, hyaline. Fore wing with vein 1cu-a opposite M&RS. Vein 2rs-m obliterated, RS touching M far in front of 2m-cu. Postnervulus intercepted slightly below middle. Hind wing vein 1-cu almost as long as cu-a. Propodeum ( Fig. 28 ) entirely with coarsely reticulate. Area basalis triangular. Area superomedia pentagonal, with irregular wrinkles. Apophysis strong, blunt crenate. Propodeal spiracle elliptical.

METASOMA. First tergite ( Fig. 29 ) evenly convex, strongly rugulose-punctate; approximately 1.7 × as long as posterior width, evenly narrowed anteriorly; near middle slightly contracted; anterior portion of latero-median carina vestigial; dorso-lateral carina indistinct; spiracle almost circular, convex, located at anterior 0.4 of first tergite. Tergite 2 ( Fig. 29 ) with sculpture as tergite 1, almost ectangular, 0.7× as long as posterior width, basal-laterally with short weak oblique groove. Tergite 3 ( Fig. 29 ) with sides distinctly convergent posteriorly, with uneven punctures, gradually sparser posteriorly; approximately 0.6× as long as anterior width, 0.7× as long as posterior width. Tergites 4–6 almost smooth, shiny. Tergite 7 with indistinct fine transverse aciculate, posterior margin slightly concave medially. Tergite 8 triangular, apex truncate. Ovipositor sheath approximately 2.6× as long as hind tibia. Apical portion of ovipositor ( Figs 20 , 30 ) distinctly down-curved; lower valve with weak ridges.

COLOUR ( Fig. 20 ). Black, except for following: apical portion of flagellomere 10, flagellomeres 11–15 and basal portion of flagellomere 16 white; clypeus mostly and mandible black brown; fore and mid femora, tibiae and tarsomeres 1–4 yellowish to reddish brown; hind tibia proximally dark brown, distally brownish black; pterostigma and veins brownish black; pterostigma proximally white.

Male

Unknown.

Differential diagnosis

The new species is similar to X. pissodius Sheng & Wen, 2008 in being relatively small, with pterostigma short and wide, and head, mesosoma and metasoma almost entirely black, but can be distinguished from X. pissodius by the following combination of characters: postocellar line 0.9 × as long as ocular-ocellar line; frons without median longitudinal groove; fore wing with vein 1cu-a opposite M&RS; fore and mid tibiae normal, not stoutly clavate; tergite 2 ( Fig. 29 ) 0.7 × as long as posterior width; flagellomeres 11–15 and proximal portion of flagellomere 16 white. In X pissodius : postocellar line is 1.4× as long as ocular-ocellar line; frons with dense transverse wrinkles and a median longitudinal groove; fore wing with vein 1cu-a distinctly distad of M&RS; fore and mid tibiae exceptionally stout, clavate; area petiolaris with indistinct longitudinal wrinkles; tergite 2 as long as posterior width; flagellomeres 9 to 12 white.

Figures

Figs 20–22. Xorides kuandianense Sheng, Broad & Sun sp. nov., holotype, ♀ (CBDPC). 20. Habitus, lateral view. 21. Head, anterior view. 22. Head, lateral view.

Figs 23–26. Xorides kuandianense Sheng, Broad & Sun sp. nov., holotype, ♀ (CBDPC). 23. Head, dordal view. 24. Head, dorsoanterior view. 25. Apical portion of antenna, lateral view. 26. Mesoscutum, dorsal view.

Figs 27–30. Xorides kuandianense Sheng, Broad & Sun sp. nov., holotype, ♀ (CBDPC). 27. Mesosoma, lateral view. 28. Propodeum, dorsal view. 29. Metasoma, dorsal view. 30. Apical portion of ovipositor, lateral view.