Acerentominae

Shrubovych, Julia & Rusek, Josef, 2010, Sugaentulus andrzeji sp. nov. from Siberia, Russia (Protura: Acerentomidae: Acerentominae) and key to Acerentominae genera, Zootaxa 2720, pp. 59-68 : 67

Key to genera of Acerentominae

Szeptycki (2007) considered the family Acerentomidae as proposed by Yin (1999) to be only of subfamily rank. The generic taxonomy of Acerentomidae was developed mainly by Tuxen (1963, 1964, 1981, 1984), Nosek (1973, 1978), Rusek (1974a), Imadaté (1974), Yin (1983a, 1999) and Szeptycki (1988, 2007). We provide a key restricted to acerentomine genera sensu Szeptycki (2007).

1. Mesonotum with 3+3 or 4+4 A -setae and metanotum with 4+4 A -setae; sternites with 5 or more A -setae; seta P3 on tergites II–VI in line with other P- setae; striate band well developed.......................................................................... 2

- Mesonotum and metanotum with 2+2 A -setae; sternites with 3 A -setae; seta P3 on tergites II–VI slightly anterior to P- seta row; striate band well developed or reduced ..................................................................................................... 5

2. Mesonotum with 3+3 A -setae ...................................................................................................................................... 3

- Mesonotum with 4+4 A -setae ....................................................................................................................................... 4

3. Forestarsal sensillum t1 filiform, abdominal legs with two setae nearly equal in length; foretarsal sensillum a’ between t1 and t2 .................................................................................................................. Filientomon Rusek, 1974

- Forestarsal sensillum t1 claviform, abdominal leg setae of different lengths (apical seta about half length of subapi- cal seta); foretarsal sensillum a’ distal to t2 and close to c’ ............................................. Acerentomon Silvestri, 1907

4. Foretarsal sensillum t1 baculiform .................................................................................. Yamatentomon Imadaté, 1964

- Foretarsal sensillum t1 claviform .................................................................................... Orientomon Yin & Xie, 1993

5. Striate band well developed, foretarsal sensillum t1 claviform ........................................... Sugaentulus Imadaté, 1978

- Striate band reduced, foretarsal sensillum t1 claviform or filiform.............................................................................. 6

6. Foretarsal sensillum b’ missing .................................................................................................................................... 7

- Foretarsal sensillum b’ present .................................................................................................................................... 8

7. Foretarsal sensillum t1 filiform, abdominal legs II and III with two nearly equal setae, labial palp with tuft of setae ............................................................................................................................................. Huashanentulus Yin, 1980

- Foretarsal sensillum t1 claviform, abdominal legs II and III with apical seta about half the length of subapical seta; labial palp without tuft of setae .............................................................................................. Yichunentulus Yin, 1980 *

8. Abdominal legs II and III with three setae .......................................................................... Fjellbergella Nosek, 1978

- Abdominal legs II and III with two nearly equal setae................................................................................................ 9

9. Foretarsal sensillum t1 claviform, foretarsal sensillum a’ close to t2 .............................. Tuxenentulus Imadaté, 1973

- Foretarsal sensillum t1 filiform, foretarsal sensillum a’ close to t1 .............................................. Wenyingia Imadaté, *According to Szeptycki (2007) and following Yin (1999) Yichunentulus belongs to Acerentominae , but this placement is doubtful because of the reduced labial palps.