Palaeorhoptrocentrus kanti Belokobylskij, 2023

Belokobylskij, Sergey A. & Manukyan, Andranik R., 2023, Doryctinae (Hymenoptera, Braconidae) from Baltic amber: description of a new genus and species, Zootaxa 5249 (5), pp. 577-584 : 580-583

Palaeorhoptrocentrus kanti Belokobylskij , sp. nov.

Figs 1 , 2

http://zoobank.org/ 051B4987-EEB7-4BFF-ADC1-6049F5A57224

Type material. Holotype: female, # BX 54/22, Eastern coast of the Baltic Sea, Kaliningrad Province, late Eocene Baltic amber ( KAM).

Paratype. 1 female, second specimen in the same amber piece with # BX 54/22 ( KAM) .

Description. Female. Body length 2.0– 2.3 mm; fore wing length 1.6–1.7 mm.

Head. Head relatively high, its width approximately 1.6 × medial length. Occiput weakly concave; temple distinctly convex (dorsal view). Transverse diameter of eye almost 2.0 × longer than temple (dorsal view). POL approximately 2.0 × Od and 1.3 × OOL. Eye 1.2 × as high as broad (lateral view). Malar space almost 0.2 × height of eye. Maxillary palpus long, reaching middle coxa, its last (sixth) segment 4.5 × longer than wide.

Antenna. Scape 1.7 × longer than maximum width, 1.4 × longer than pedicel. First flagellomere wide, approximately 4.0 × longer than its maximum width; second flagellomere narrow, approximately 7.0 × longer than its maximum width. Penultimate flagellomere approximately 4.0 × longer than its maximum width, almost as long as apical flagellomere.

Mesosoma. Mesosoma long, 1.9 × longer than its maximum height. Neck of prothorax relatively short. Median lobe of mesoscutum convex, weakly protruding forward, roundly convex anteriorly and without anterolateral corners. Prescutellar depression (scutellar sulcus) relatively long, approximately 0.3 × as long as scutellum. Subalar depression shallow and weakly rugulose. Precoxal sulcus smooth. Lateral carinae between propodeum and metapleuron distinct and complete.

Wings. Fore wing wide, 2.7 × longer than its maximum width. Pterostigma wedge-shaped, 3.8 × longer than its width. Radial vein (r) arising from basal 0.35 of pterostigma. First (r) and second (3RSa) radial abscissae forming weakly obtuse angle; first abscissa (r) 0.6 × as long as maximum width of pterostigma. Second radial abscissa (3RSa) 3.5 × longer than first abscissa (r), 0.5 × as long as weakly sinuate third abscissa (3RSb), 1.4 × longer than the straight first radiomedial vein (2RS). Second radiomedial (submarginal) cell wide and relatively long, 2.4 × longer than its maximum width, 1.8 × longer than brachial (first subdiscal) cell. Recurrent vein (1m-cu) 0.8 × as long as first radiomedial vein (2RS), 0.7 × as long as basal vein (1M). Discoidal (first discal) cell rather short, 1.8 × longer than its maximum width. Nervulus (cu-a) approximately 0.5 × as long as distance between basal (1M) vein and nervulus (cu-a). Parallel vein (2CUb) weakly curved basally. Brachial (second subdiscal) cell relatively short and narrow. Hind wing 5.0 × longer than its maximum width. First costal abscissa (C+SC+R) 0.4 × as long as second abscissa (1-SC+R). First abscissa of mediocubital vein (M+CU) 0.6 × as long as second and third abscissae combined (1-M).

Legs. Fore femur almost 5.0 × longer than maximum width. Hind coxa 1.6 × longer than its maximum width, 0.9 × as long as propodeum. Hind femur 3.5 × longer than its width. Hind tarsus almost as long as hind tibia. Hind basitarsus 0.7 × as long as second to fifth segments combined. Second segment of hind tarsus 0.5 × as long as basitarsus, almost as long as fifth segment (without pretarsus).

Metasoma. Metasoma 1.3 × longer than head and mesosoma combined. First metasomal tergite almost as long as its distal maximum width and approximately as long as propodeum; apical width of first tergite 1.5 × its subbasal width and approximately 2.0 × its basal width. Second and third tergites combined 0.8 × as long as basal width of second tergite, 0.6 × as long as their maximum width. Ovipositor straight; ovipositor sheath 0.8 × as long as metasoma, 1.5 × longer than mesosoma, 0.55 × as long as fore wing.

Sculpture and pubescence. Vertex densely transversely and sinuately striate; temple almost entirely densely transversely and curvedly striate, with additional reticulation. Areola of propodeum 1.4 × longer than its width; basomedial carina developed in basal half of propodeum. Hind coxa and femur mainly smooth. First metasomal tergite entirely striate. Second tergite distinctly divergently striate in basal half. Remaining part of metasoma smooth. Hind tibia with dense and short semi-erect setae, its length 0.5–0.7 × maximum width of tibia.

Colour. Body almost entirely dark brown. Legs mainly reddish brown to dark reddish brown. Fore wing hyaline. Pterostigma entirely dark brown.

Male. Unknown.

Etymology. This species is named in honour of great German philosopher Immanuel Kant, who was born, lived and died in K̂nigsberg (= Kaliningrad), where he was buried.

Figures

FIGURE 1. Palaeorhoptrocentrus kanti gen. et sp. nov. (holotype, female, Baltic amber, BX 54/22) (A) Habitus, lateral view. (B) Body (head, mesosoma and metasoma), lateral view. (C) Head and basal antennomeres of antenna, lateral view. (D) Head and mesosoma, lateral view. (E) Propodeum, metasoma and ovipositor, lateral view. (F) Apical antennomeres of antenna. (G) Wings. (H) Medial part of fore wing.

FIGURE 2. Palaeorhoptrocentrus kanti gen. et sp. nov. (paratype, female, Baltic amber, BX 54/22) (A) Habitus, dorsal view. (B) Habitus, lateral view. (C) Head and mesosoma, dorsal view. (D) Head and mesosoma, lateral view. (E) Propodeum and basal half of metasoma, dorsal view. (F) Metasoma, dorsal view. (G) Metasoma and ovipositor, lateral view. (H) Fore wing.