Balticampsis inopinatus Belokobylskij, 2025

Balticampsis inopinatus Belokobylskij , gen. nov. & sp. nov.

http://zoobank.org/ 8FF3BD7E-8777-4E99-828F-0B661AAA05F4

Figs 1–3 View FIGURE 1 View FIGURE 2 View FIGURE 3

Type material. Holotype: female (with syninclusions of plantae – perhaps remains of Quercus spp. ), KAM # 4425 (KAM).

Type locality and horizon. Baltic amber; Late Eocene , Prussian Formation , Priabonian range (37.2–33.9 Mya). Southeast coast of the Baltic Sea, Primorskiy quarry, Yantarnyi, Kaliningrad Province, Russia .

Etymology. Named from the Latin “ inopinatus ” (= unexpected) because it was surprising to find a member of the Sigalphinae embedded in Baltic amber.

Description. Female. Body length about 4.5 mm; fore wing length 3.4 mm.

Head (dorsal view) ~ 1.8 × as wide as maximum medial length. Temple short, transverse diameter of eye (lateral view) ~ 2.6 × longer than temple. POL 1.8 × Od, 0.8 × OOL; Od about 2.0 × OOL. Eye 1.3 × as high as broad (lateral view). Face 1.5 × wider than its height with clypeus, 1.4 × height of eye. Malar space short, 0.2 × height of eye, ~ 0.5 × basal width of mandible. Maxillary palpus approximately as long as height of head.

Antenna with multiporous plate-like sensillae (rhinaria) on antennomeres especially visible in its apical half, with 29 antennomeres, about 0.8 × as long as body. Scapus short, ~ 1.5 × longer than its maximum width, and ~ 2.0 × longer than pedicel. First flagellomere ~ 3.8 × longer than its maximum width, 1.4 × longer than second flagellomere; second flagellomere ~ 2.8 × longer than its maximum apical width. Penultimate flagellomere ~1.3 × longer than its maximum width, 0.25× as long as first flagellomere, 0.6 × as long as apical flagellomere.

Mesosoma ~ 1.8 × longer than its maximum height. Median lobe of mesoscutum weakly protruding forward, almost straight anteriorly. Subalar depression relatively shallow. Precoxal sulcus relatively narrow, sparsely crenulate. Meso-metapleural suture distinct, densely crenulate. Propodeum with coarse carina separating it from metapleuron (lateral view).

Wings. Fore wing wide, 2.6 × longer than its maximum width. Pterostigma 2.8 × longer than its width. Radial (marginal) cell wide, 3.0 × longer than its maximum width. First (r) and second (3RSa) radial abscissae forming distinct obtuse angle; first abscissa (r) 0.5 × as long as maximum width of pterostigma. Second radial abscissa (3-SR) 4.2 × longer than first abscissa (r), 0.8 × as long as third abscissa (SR1), 1.5 × longer than the straight first radiomedial vein (2-SR). Second radiomedial (submarginal) cell relatively wide, weakly narrowed distally, 2.2 × longer than its maximum width, 1.5 × longer than brachial (subdiscal) cell. Recurrent vein (m-cu) 0.6 × as long as first radiomedial vein (2-SR). Discoidal (discal) cell long and relatively narrow, 2.3 × longer than its maximum width. Distance (1-CU1) between basal vein (1-M) and nervulus (cu-a) ~ 0.5 × nervulus (cu-a) length. Brachial (first subdiscal) cell ~ 3.0 × longer than its maximum width. Hind wing ~ 5.0 × longer than its maximum width. First abscissa of mediocubital vein (M+CU) 1.6 × longer than second abscissa (1-M).

Legs. Hind coxa ~ 1.5 × longer than wide. Hind femur 4.5 × longer than its width. Hind tibia ~ 7.0 × longer than its maximum width, 1.4 × longer than hind femur. Hind tarsus 0.7 × as long as hind tibia. Second segment of hind tarsus 0.3 × as long as basitarsus, 0.8 × as long as fifth segment (without pretarsus).

Metasoma 1.2 × longer than head and mesosoma combined; all tergites behind third one visibly, not retracted under third one. First metasomal tergite elongated, about 1.5 × longer than second tergite, almost as long as propodeum. Ovipositor sheath 0.6 × as long as mesosoma, 1.2 × longer than hind femur, and 0.5 × as long as fore wing.

Sculpture and pubescence. Vertex and temple smooth, only partly with fine punctation; face almost entirely smooth. Pronotum laterally mainly smooth, only with sparse rugae in narrow areas. Mesoscutum and scutellum smooth. Mesopleuron finely and sparsely crenulate in subalar depression, widely smooth. Metapleuron sparsely and coarsely reticulate-areolate, almost smooth medially. Propodeum widely rugulose-reticulate, perhaps almost smooth latero-anteriorly; areola absent. Hind coxa smooth; hind femur sparsely and finely punctate. First metasomal tergite almost entirely smooth, second and third tergites smooth. Face covered by dense and relatively long pale setae. Hind tibia with very dense and short setae on its dorsal margin. Ovipositor sheath rather densely and shortly setose.

Colour. Body dark brown to black. Antenna and legs dark brown. Palpi brown. Fore wing faintly infuscate. Pterostigma entirely dark brown.

Male. Unknown.