Key to Pimplinae of Baltic Amber

1. Flagellum with 15 flagellomeres. Base of cell R (basal cell) in hind wing strongly narrowed proximally. Nervellus in hind wing entire, sinuately curved; vein 2 CU absent. Genus Twangste Manukyan, 2024 ........ T. belokobylskiji Manukyan, 2024

– Flagellum with more than 15 flagellomeres. Base of cell R in hind wing not narrowed proximally. Nervellus in hind wing angulate (broken); vein 2 CU present (Fig. 5)............................................................... 2

2. Occipital carina absent dorsally. Genus Crusopimpla Kopylov, Spasojevic & Klopfstein, 2018 ............................................................................................... C. klopfsteinae Manukyan, 2023

– Occipital carina complete.............................................................................. 3

3. Metasoma with deep double impressions creating false segmentation appearance in T2–T5. Flagellum with 44 flagellomeres. Body length about 17.0 mm; fore wing length ~ 13.8 mm. Genus Xanthopimpla Saussure, 1892 ...................................................................................... Xanthopimpla sp. (Manukyan et al. in press)

– Metasoma with weakly indicated unpaired impressions (Figs 6, 7). Flagellum with 33–37 flagellomeres. Body length 5.7–6.0 mm; fore wing length 4.4–4.8 mm. Genus Firkantus Viertler, Klopfstein & Spasojevic in Viertler et al. 2023 .......... 4

4. Aedeagus laterally depressed (Fig. 7B). Parameres longer than T7 and T8, shorter than other metasomal tergites. Nervulus distinctly postfurcal (Fig. 5A). Vein 1 Cu elongate, ~ 0.5 × as long as 1 cu-a, ~ 0.3 × length of 1 M+ 1 Rs. Antenna with 37 flagellomeres (Fig. 2B). T1 with dorsolateral carina sharp, distinct, extending to tergal apex (Fig. 6C). Arolium of hind tarsus short, not surpassing claw apex. Epicnemial carina complete, reaching pronotal apex. Fore wing cell 2 R1 3.4× as long as wide. Pterostigma 3.0 × longer than wide. Mandible broad, 1.5 × as long as wide at base.... F. storozhenkoi Manukyan, sp. nov.

– Aedeagus dorso-ventrally depressed. Parameres elongate, longer than most metasomal tergites. Nervulus interstitial relative to 1M+1Rs. Vein 1Cu absent or strongly reduced. Antenna with 33 flagellomeres. T1 with dorsolateral carina absent or indistinct, vestigial at anterior and posterior ends of T1. Arolium of hind tarsus elongate, distinctly surpassing claw apex. Epicnemial carina extending only to ventral third of pronotum. Fore wing cell 2 R1 length 3.0 × as long as width. Pterostigma 3.8× longer than wide. Mandibles narrow, twice longer than wide at base.......................................................................................... F. freddykruegeri Viertler, Klopfstein & Spasojevic in Viertler et al. 2023