Periphyllus

Wieczorek, Karina & Junkiert, Łukasz, 2011, Description of sexuales of Periphyllus singeri (Börner) (Hemiptera, Aphidoidea: Chaitophorinae), Zootaxa 2872, pp. 63-68 : 67

Key to known males of European species of the genus Periphyllus

1. Apical segment of rostrum with more than 10 accessory hairs............................................ P. singeri

-. Apical segment of rostrum with less than 10 accessory hairs.................................................... 2

2. Hind tibiae uniformly black................................................................. P. californiensis

-. Hind tibiae pale, dusky or dark only on base and apex........................................................ 3

3. Hind tibiae dark on base and apex, pale at middle part............................................. P. testudinaceus

- Hind tibiae pale or dusky............................................................................... 4

4. Cauda helmet-shaped or knobbed......................................................................... 5

-. Cauda broadly rounded................................................................................. 7

5. Cauda helmet-shaped......................................................................... P. lyropictus

-. Cauda knobbed....................................................................................... 6

6. VIb very long, about 0.9 times antennal segment III; distal part of tibiae dark............................ P. hirticornis

-. VIb about 0.85 times antennal segment III; distal part of tibiae pale...................................... P. obscurus

7. Siphunculi short, 0.5–0.6 times HT II...................................................................... 8

-. Siphunculi long, 0.75 times or as long as HT II.............................................................. 9

8. Siphunculi dark; antennal segment III with more than 40 rhinaria....................................... P. coracinus

-. Siphunculi pale; antennal segment III with less than 40 rhinaria........................................ P. rhenanus

9. VIb more than 3.3 times VIa................................................................... P. bulgaricus

-. VIb less than 3.3 times VIa............................................................................. 10

10. VIb less than 0.55 times antennal segment III...................................................... P. acericola

-. VIb more than 0.55 times antennal segment III....................................................... P. aceris