Astenus (Eurysunius), Reitter, 1909

Anlaş, Sinan, 2019, On the subgenus Eurysunius Reitter of Turkey VI. Two new species from Sivas province in central northern Anatolia, with a key to Turkish species (Coleoptera: Staphylinidae: Paederinae, Astenus), Zootaxa 4608 (2), pp. 389-395 : 394-395

Key to the Turkish species of the subgenus Eurysunius

The keys to Turkish Eurysunius species in Assing (2002, 2007, 2010, 2011, 2013, 2015) and Anlaş (2014, 2015, 2016, 2017, 2018) are modified as follows:

1. Lateral margins of pronotum with one seta at anterior angle; elytra with yellow coloration confined to posterior third. Northern Anatolia: Ordu ................................................................. A. bicoloratus Assing, 2002

- Lateral margins of pronotum with more than one seta....................................................... 2.

2. Lateral margins of pronotum with two setae at anterior and posterior angles...................................... 3.

- Lateral margins of pronotum with three setae; one at anterior angle, one at anterior third, and one at posterior angle..... 17.

3. Pronotum approximately as wide as long.................................................................. 4.

- Pronotum transverse.................................................................................. 6.

4. Elytra uniformly yellowish or with yellow coloration confined to posterior half; legs and antennae yellowish red. Northern Anatolia: Bolu, Kastamonu ..................................................... A. paphlagonicus Assing, 2002

- Elytra narrowly yellowish; legs and antennae reddish or reddish brown.......................................... 5.

5. Posterior 1/6–1/5 of the elytra yellowish; antennomeres IV–X approximately as long as broad to weakly transverse. Greece: Rhodes; Southwestern Anatolia: Muğla ................................................ A. rhodicus Assing, 2013

- Posterior 1/8 of the elytra yellowish antennomeres; IV–X nearly 1.5 times as long as broad. Central-northwestern Anatolia: Bursa (Uludağ)................................................................... A. brachati Assing, 2011

6. Pronotum wider than head............................................................................ .. 7.

- Pronotum narrower than head...........................................................................8.

7. Pronotum distinctly (approximately 1.20 times) wider than head. Central-western Anatolia: Afyonkarahisar, Konya ...................................................................................... A. sultanicus Assing, 2010

- Pronotum slightly (approximately 1.05 times) wider than head. Western Anatolia: Denizli (Gölgeli Mountains)........................................................................................... A. occiduus Assing, 2007

8. Head and pronotum blackish or dark brown................................................................9.

- Head and pronotum reddish or reddish brown............................................................. 12.

9. Forebody completely blackish. Central-western Anatolia: Uşak and Kütahya .................. A. kumlutasi Anlaş, 2015

- Forebody not completely blackish..................................................................... .. 10.

10. Forebody blackish or dark brown........................................................................11.

- Head blackish or dark brown; pronotum reddish; elytra reddish-yellow with slightly infuscate portion near scutellum. Central Anatolia: Niğde (Melendiz Mountain)............................................... A. melendizicus Anlaş, 2018

11. Forebody blackish, with posterior 1/3 of elytra reddish. Western Anatolia: Aydın, Izmir ............. A. orgeli Anlaş, 2015

- Forebody blackish or dark brown, posterior half of elytra reddish-yellow. Central-western Anatolia: Afyonkarahisar (Ahır Mountains).......................................................................... A. ilgazi Anlaş, 2016

12. Dorsal surface of pronotum without pronounced impressions; head, pronotum and elytra completely reddish brown. Centralwestern Anatolia: Afyonkarahisar (Sandıklı Mountains).................................. A. sandiklicus Anlaş, 2014

- Dorsal surface of pronotum with pronounced impressions; head, pronotum and elytra not completely reddish brown..... 13.

13. Head darker than pronotum and elytra; head reddish brown, pronotum and elytra reddish, with the posterior area slightly lighter. Southwestern Anatolia: Antalya .......................................................... A. goeki Anlaş, 2017

- Head not darker than pronotum and elytra................................................................ 14.

14. Abdomen wider than elytra............................................................................15.

- Abdomen narrower than elytra......................................................................... 16.

15. Head and pronotum reddish brown, elytra yellowish brown, with area near scutellum, anterior margin, and anterior part of lateral margin infuscate, abdomen dark brown. Western Anatolia: Denizli (Çökelez Mountains)..... A. gusarovi Anlaş, 2015

- Head, pronotum and abdomen reddish brown, more than anterior half of elytra dark brown, with posterior area reddish yellow. Western Anatolia: Denizli (Honaz Mountain)........................................... A. honazicus Anlaş, 2015

16. Elytra weakly transverse (1.10–1.15 times as long), completely yellowish brown, with the middle of each elytron slightly infuscate spots. Central Northern Anatolia: Sivas (İmranlı, Divriği).................................. A. pelinae sp. n.

- Elytra distinctly transverse (1.70–1.75 times as long), not completely yellowish brown; anterior half of elytra black or dark brown, with posterior area yellowish brown................................................... A. sivasicus sp. n

- Head approximately as broad as pronotum; legs and antennae reddish or blackish-brown, Eyes nearly as long as postocular region. Central Anatolia: Nevşehir ..................................................... A. kociani Assing, 2015