Neocyrtoptyx exilis, Xiao & Yan, 2020

Xiao, Hui & Yan, Jiahe, 2020, A new genus of Pteromalidae (Hymenoptera) with two new species, parasitoids of larvae of Stenocephus fraxini Wei (Hymenoptera: Cephidae) from China, Zoological Systematics 45 (3), pp. 231-235 : 233-235

Neocyrtoptyx exilis sp. nov. ( Figs 9–10 )

Diagnosis. Head in frontal view almost circular, 1.09× as wide as high; eye height 0.47× head height; clypeus 1.45× as wide as high. Antenna with clava as long as the length of Fu 4 and Fu 5 combined. Postmarginal vein 1.15× as long as stigmal vein; Gt 1 0.14× length of gaster.

The new species is slimmer than N. shanghensis sp. nov. at first sight, it can be recognized by the characters listed in the key.

Description. Female (holotype). Body ( Figs 9–10 ) length 4.0 mm. Head and thorax dark green with bluish reflection, gaster dark brown. Mandibles brown, antennae yellowish. Coxae concolorous with body, femur brown, tibia and tarsi yellow, pretarsus yellowish brown.

Head in frontal view reticulated, 1.09× as wide as high; eye height 0.47× head height; eyes separated by 1.53× their height. Antennal scrobes shallow, reaching anterior ocellus. Clypeal suture obvious, clypeus 1.45× as wide as high, with radial striation; clypeal margin emarginate. Antennae inserted in middle of face, distance from lower margin of torulus to lower margin of clypeus 1.53× distance from upper margin of torulus to lower margin of anterior ocellus. Gena smooth and convex; malar sulcus indistinct, malar space 0.5× eyes height. Length of pedicel and flagellum combined shorter than head width (0.91×); pedicel conical, 1.5× as long as broad in lateral view, shorter than each funicular segment; anellus transverse; each funicular segment longer than its broad, with three irregular rows of sensilla, clava segment with single row of sensilla; ratio of length and width from Fu 1 to Fu 5 as 16:8, 15:8, 14:8, 12:8, 11:8; clava not clavate, 2.87× as long as broad, as long as Fu 4 and Fu 5 combined. Head in dorsal view, 2.16× as wide as long; POL 2.12× OOL, temple short.

Head slightly wider than thorax (1.11× as broad as mesosoma) ( Fig. 10 ). Pronotum, mesoscutum and scutellum with raised reticulation. Pronotum 0.91× as broad as mesoscutum. Mesoscutum 1.76× as broad as long; notauli shallow and incomplete. Scutellum 1.15× as broad as long, frenal line absent. Dorsellum reticulation, 2.6× as broad as long. Propodeum smooth, 0.2× as long as scutellum, median carina distinct. Prepectus small and smooth. Fore wing with marginal fringe absent; ratio of marginal vein: postmarginal vein: stigmal vein as 33:23:20; stigmal vein oblique, stigma expand backwards, stigmal more than 1/3 length of stigmal vein.

Gaster lanceolate, 2.54× as long as broad, longer than head and mesosoma combined (1.32×); hind margin of Gt 1 and Gt 2 angularly produced and emarginate in the middle; Gt 1 0.14× length of gaster, Gt 2 shorter than Gt 1. Ovipositor sheaths not produced in dorsal view.

Male. Unknown.

Type material. Holotype, female, China, Shandong, Shanghe Xian (37.18°N, 117.09°E), 1.VIII.2015 – 6.VI.2015, leg. Jiahe Yan (Hyp-2018-75) . Paratypes. 2♀ (Hyp-2018-75), same data as holotype .

Etymology. The specific name from the Latin word exilis , meaning slim, in reference to the slim body.

Biology. Parasitic on the larvae of Stenocephus fraxini ( Hymenoptera , Cephidae ).

Distribution. China (Shandong).

Funding This work was supported by the National Natural Science Foundation of China (31672328, 31750002).

Figures

Figures 1–10. Neocyrtoptyx spp. 1–8. N. shanghensis, sp. nov., female, holotype. 1. Body in dorsal view. 2. Body in lateral view. 3. Head in frontal view. 4. Antenna. 5. Mesosoma in dorsal view. 6. Body in lateral view. 7. Fore wing in dorsal view. 8. Male, body in lateral view. 9–10. N. exilis sp. nov., female, holotype. 9. Body in dorsal view. 10. Body in lateral view.