Nemeritis petila Han, 2025

Han, Yuan-Yuan, Wei, Cheng-Xue, Xu, Rong-Lin & Chen, Xue-Xin, 2025, First record of the genus Nemeritis Holmgren (Ichneumonidae, Campopleginae) from China, with descriptions of two new species, Zootaxa 5679 (2), pp. 286-292 : 289-291

Nemeritis petila Han , sp. nov.

urn:lsid:zoobank.org:act:191F8EF9-AD9B-4E5B-8786-CE201F8E27C9

Figs 3, 4 , 5

Materia examined. Holotype: CHINA • ♀; Sichuan, Huanglong, Danyunxia ; 17.VII.2024; Yuan-Yuan Han leg.; No. 202401879 . Paratypes: CHINA • 3♀; Sichuan, Huanglong, Danyunxia ; 17.VII.2024; Yuan-Yuan Han leg.; No. 202401881, 202401936, 202401953 .

Description. Female ( Fig. 3) holotype. Body length 6.0 mm, fore wing length 4.4 mm.

Head. Antenna with 38 flagellomeres; first flagellomere ca. 5.1× longer than wide, second flagellomere ca. 4.4× longer than wide. Face ( Fig. 4E ) granulose. Clypeus ( Fig. 4E ) nearly smooth, with sparse small and shallow punctures, apical margin arched. Malar space granulose, ca. 0.6× basal width of mandible. Upper tooth of mandible equal to the length of lower tooth, with lamella very weak. Frons granulose, without median carina. Vertex ( Fig. 4F ) granulose. Interocellar region granulose. Interocellar distance 0.4× ocello-ocular distance and 1.0× distance between median and lateral ocelli; distance between lateral ocellus and eye ca. 1.1 × as long as diameter of ocellus. Temple subpolished, swollen behind eyes, ca. 0.65× as long as eyes in lateral view, 0.6× as long as eyes in dorsal view. Occipital carina evenly arched, reaching hypostomal carina at mandible base.

Mesosoma. Pronotum granulose. Mesoscutum ( Fig. 4G ) granulose, notauli absent, lateral-anteriorly inclined. Scutellum and metanotum granulose. Mesopleuron ( Fig. 4B ) granulose with small and sparse punctures, weakly transversely striate below tegula, speculum smooth and shiny. Metapleuron ( Fig. 4B ) granulose. Propodeum ( Fig. 4C ) granulose; area basalis confluent with area superomedia, lateromedian longitudinal carina absent at base and medially of propodeum, suddenly narrowed between the area basalis and superomedia, but not merge; posterior transverse carina gradually stronger and wider laterally; area superomedia narrow; costulae and lateral longitudinal carinae absent; spiracle rounded.

Wing. Fore wing ( Fig. 4A ) areolet present emitting vein 2m-cu from its distal half, with a short stalk. Marginal cell short, vein RS ca. 2.3× longer than vein 2r&RS. Vein 1cu-a opposite of M&RS. Lower external angles of second discal cell acute (60°). Hind wing with CU&cu-a vertical, not intercepted.

Legs. Hind femur 4.9× longer than wide. Inner spur of hind tibia ca. 0.45× as long as first tarsomere of hind tarsus. Tarsal claws not pectinate.

Metasoma. First segment ( Fig. 4H ) without glymma, ca. 4.2× longer than width of postpetiole; petiole ca. 1.7× longer than postpetiole. Second tergite ca. 1.3× longer than first tergite, 2.3× longer than its apical width; thyridium oval, its distance from basal margin of tergite ca. 3.0× its length. Third tergite 2.2× its apical width. Sixth and seventh tergites without a deep emargination dorso-medially. Ovipositor ( Fig. 4D ) very long and thin, 3.3× longer than hind tibia, with a subapical notch on upper valve, sinuated apically; ovipositor sheath 2.2× longer than hind tibia.

Colour. Black. Scape and pedicel blackish brown, mandible except teeth and tegula yellow; fore and mid legs yellowish brown, apical tarsomere blackish brown; hind leg trochanter apically, trochantellus and tibia medially yellowish brown, remainder of hind leg blackish brown; metasoma entirely black.

Male. Unknown.

Distribution. China (Sichuan), Oriental Region.

Etymology. From “petila ” (Greek for “slender”), because of its’ slender body.

Comparative diagnosis. This species is similar to N. macrura (Viereck, 1925) , but differs from the latter by having the lateromedian longitudinal carina absent at base and medially of popodeum, hind coxa and femur black, second tergite ca. 1.3× longer than first tergite.

Figures

FIGURE 4. Nemeritis petila sp. nov., holotype, female. A fore wing B mesosoma, lateral view C propodeum, dorsal view D ovipositor, lateral view E head, anterior view F head, dorsal view G mesoscutum, dorsal view H first metasomal segment, lateral view.

FIGURE 5. Propodeal carination (surface sculpture not indicated). A Nemeritis kophosa sp. nov. B Nemeritis petila sp. nov.