Aprostocetus (Ootetrastichus) walkeri Kosheleva, 2025

Aprostocetus (Ootetrastichus) walkeri Kosheleva , sp. n.

https://zoobank.org/NomenclaturalActs/ FB7A71ED-FE41-4394-996D-CEC62CA012D6

Figs 23–27 View Figs 23–27

TYPE MATERIAL. Holotype, female: Russia: Amur Prov.: KhR, 24 km W Arkhara, сordon Kleshinskoe ozero, forest, 12–14.VIII 2022 ( OK) (antenna, permanent slide, no. 161) ( ZISP).

DESCRIPTION. Female (holotype). Body length 1.50 mm. Body dark green with golden reflections. Antennae brown. Legs brownish, except coxae concolorous with body. Tegulae dark brown. Wings hyaline, venation yellowish.

Head 1.10 times as broad as mesoscutum, 2.13 times as broad as long (in dorsal view); 1.31 times as broad as height (in frontal view); temples 0.15 length of eyes; POL 1.67 OOL, OOL 2.00 OD. Frons without median line. Eyes 1.86 times as long as broad (in dorsal view), 1.31 times as height as broad (in lateral view), separated by 1.27 times their own height (in frontal view). Malar space 0.63 height of eye, malar sulcus straight. Mouth 1.09 times as malar space. Antenna ( Fig. 27 View Figs 23–27 ) with scape, 3.59 times as long as broad, its front edge with three setae; 0.93 as height as eye, reaching above vertex; pedicel plus flagellum 1.46 times breadth of mesoscutum; pedicel twice times as long as broad and 0.80 as long as F1; funicle proximally about as stout as pedicel, its segments decreasing in length, F1 2.50 times, F2 1.94 times, F3 1.59 times as long as broad, clava 2-segmented, slightly broader than F3, 3.26 times as long as broad, 0.91 times as long as F2 plus F3; apical claval segment with spine short.

Mesosoma 1.71 times as long as broad. Pronotum ( Fig. 23 View Figs 23–27 ) subconical, 0.42 times as long as mesoscutum. Mid lobe of mesoscutum 1.15 times as broad as long, shiny, with engraved longitudinal reticulation; median line absent; two long adnotaular setae on each side. Scutellum 0.94 times as long as mesoscutum, 1.19 times as broad as long; moderately flat, sculptured like mid lobe of mesoscutum, submedian lines nearer to sublateral lines than to each other, enclosing a space 1.80 times as long as broad, anterior pair of setae slightly before the middle. Dorsellum 3.75 times as broad as long, shiny. Propodeum ( Fig. 23 View Figs 23–27 ) strongly punctate-reticulate, medially 2.5 times as long as dorsellum; median carina expanded posteriorly; spiracles very small, circular, separated by their diameter from metanotum; callus with 4 setae. Forewing 2.62 times as long as broad; SM with 2 dorsal setae; costal cell 0.86 times as M; M 5.00 times length of ST; speculum rudimentary, cilia of apical margin about 0.86 length of ST. Hindwing narrow, acute, 8.00 as long as broad; cilia 0.71 breadth of wing.

Metasoma. Gaster ( Fig. 26 View Figs 23–27 ) longitudinal-oval, acuminate, 1.29 times as long as thorax, 2.03 times as long as broad, dorsal surface finely sculptured than propodeum; last tergite as long as broad; longest setae of each cercus 2.58 times length of next longest, curved; ovipositor sheaths very slightly projecting; tip of hypopygium at 0.44 length of gaster.

MALE. Unknown.

COMPARATIVE DIAGNOSIS. In addition to the features mentioned in the diagnosis of A. (O.) kostjukovi sp. n. and the key below, A. (O.) walkeri sp. n. is also distinguished by its strongly punctate-reticulate propodeum ( Fig. 23 View Figs 23–27 ), medially 2.5 times as long as dorsellum, and gaster is also clearly reticulated ( Fig. 26 View Figs 23–27 ).

ETYMOLOGY. The new species is named in honour of the world-famous entomologist Francis Walker, who was the first to describe new species of tetrastichine wasps from the Amur River ("Amurland").