Acaudinum Börner, 1930

Key to the species of the subgenus Acaudinum Börner, 1930 View in CoL (apterous viviparous females)

1 Setae on the trochanters, femora and ventral side of the body (excluding anal plate and sometimes the posterior margin of genital plate) are short and obtuse. On various species of Centaurea View in CoL ................................. A. centaureae (Koch) View in CoL

– Setae on trochanters, femora, and ventral side of the body are long, thin.......................................... 2

2 URS/HII 1.47–1.71, with 4–6 accessory setae. The anterior margin of the genital plate has 8–10 setae. On Serratula coronata View in CoL L...................................................................................... ... A. rogeri sp.n.

– URS/HII 1.22–1.55, with 2–5 accessory setae. The anterior margin of the genital plate has 10–24 setae. On Centaurea View in CoL ..... 3

3 HII 0.136 –0.177 mm, SIPH 0.49–0.75 mm, HII/SIPH 0.080 –0.115. Centaurea scabiosa View in CoL L., C. jacea View in CoL L.................................................................................................. A. longisetosum Holman View in CoL

– HII 0.125 –0.150 mm, SIPH 0.24–0.53 mm, HII/SIPH 0.042–0.77. Centaurea rhenana Boreau View in CoL ....... A. roumanicum Holman View in CoL