Geostiba (Tropogastrosipalia) karakusensis, B & Anlaş, 2020

B, Semih Örgel & Anlaş, Sinan, 2020, Description of three new species of Geostiba Thomson, 1858 (Coleoptera: Staphylinidae, Aleocharinae) from central western Anatolia, Turkish Journal of Zoology 44 (2), pp. 156-164 : 160-164

Geostiba (Tropogastrosipalia) karakusensis sp. nov. ( Figures 1 and 4A–4K )

Type material. Holotype: TURKEY: ♂, “TR— Afyonkarahisar province, Dinar district, 6 km S Okçular village, Karakuş Mountains , 1960 m, 38°09′42″N, 30°26′11″E, 31.V.2015, leg. Anlaş, Yağmur & Örgel / Holotypus ♂ Geostiba (Tropogastrosipalia) karakusensis sp. n. det. S. Örgel & S. Anlaş 2019” ( AZMM) . Paratypes (total: 33 exs.): TURKEY: 16♂♂, 17♀♀, same locality and date as holotype (all AZMM) .

Etymology. The name derives from the type locality of the Karakuş Mountains.

Description. Habitus as in Figures 4A (male), 4B (female), and 4C (male). Body 2.4–3.3 mm.

Coloration. Head blackish brown; pronotum pale reddish brown; elytra yellowish brown; abdominal segments I–V and VIII–IX reddish brown.

Head. Approximately as wide as long; microreticulation shallow; eyes reduced; 1/3 as long as postocular region in lateral view ( Figure 4D ). Antennomere I 1.16 times longer than II, IV–X transverse, XI dilated and 1.33 times longer than IX and X combined.

Pronotum. Oblong and elongated; 1.20 times as long as wide; 1.22 times as wide as head; completely covering scutellum; posterior margin distinctly convex, acute in the middle; microreticulation fine.

Elytra. 0.52 times as long as and 1.12 times as wide as pronotum; lateral margins and near the middle well elevated; sutural carinae absent ( Figure 4E ); microreticulation shallow; punctation granulose; hind wings absent.

Abdomen. 0.98 times as wide as elytra; tergites III– IV unmodified; process of tergite VII short and stout in lateral view ( Figure 4F ); wide and apically weakly acute in dorsal view ( Figure 4G ); posterior margin of sternite VIII distinctly convex and apically acute in dorsal view, without modified setae ( Figure 4H ).

Aedeagus. Median lobe 0.26 mm long ( Figures 4I and 4J ); cristal process narrow in lateral view.

Sexual dimorphism: Pronotum and abdomen with sexual dimorphism. Pronotum in female shorter than male and abdominal tergite VII in female unmodified. Sternite VIII with very weakly modified setae. Distal portion of spermatheca weakly dilated ( Figure 4K ).

Differential Diagnosis: G. karakusensis is closely related to G. sandiklica and G. fodens . In G. karakusensis sp. nov. the lateral margins of the elytra are highly elevated, sutural carinae undefined, manica interiecta of spermatheca and cristal process of aedeagus narrow, but in G. sandiklica sp. nov., the lateral margins are not elevated and sutural carinae are pronounced on the elytra, and manica interiecta of spermatheca and cristal process of aedeagus are wider than G. karakusensis sp. nov.

G. karakusensis sp. nov. differs from G. fodens mainly by the different shape of the median lobe of the aedeagus and the sutural carina on the elytra. In G. fodens , the median lobe of the aedeagus has a very fine cristal process and the sutural carinae are pronounced on the elytra, but the cristal process of G. karakusensis sp. nov. is wider than that of G. fodens and the sutural carinae are absent in G. karakusensis sp. nov. ( Table 2).

Bionomics: Material was collected under stones in a meadow at an elevation of 1960 m.

Key for separation of new species from related congeners

The key to related congeners in Assing (2011) is modified as follows:

1. ♂: abdominal tergites III – IV unmodified ............... 2 .

- ♂: abdominal tergites II–IV with median tubercle ..... 4.

2. ♂: median lobe of aedeagus with very fine and short cristal process. Isparta (Davraz Hill) ...................................... ............................................................. G. fodens Assing, 2011

- ♂: median lobe of aedeagus with longer and stronger cristal process ........................................................................ 3.

3. ♂: lateral margins of elytra weakly elevated, sutural carinae noticeable, manica interiecta of spermatheca and cristal process of aedeagus broad. Afyonkarahisar (Sandıklı Mountains) ........................ G. sandiklica sp. nov.

- ♂: lateral margins of elytra more highly elevated, sutural carinae undefined,manica interiecta of spermatheca and cristal process of aedeagus narrower. Afyonkarahisar (Karakuş Mountains) ................... G. karakusensis sp. nov.

4. - ♂: abdominal tergites II, III with median tubercle .. ................................................................................................. 5.

- ♂: abdominal tergites III, IV with median tubercle ..... 6.

5. cristal process of aedeagus narrow and obliquely projecting away from ventral process in lateral view. Burdur (Çeltikçi geç.) ................ G. burdurica Assing, 2011

- cristal process narrow and weakly projecting away from ventral process in lateral view. Antalya (Akdağlar) .... ............................................................. G. akiana Assing, 2011

6. ♂: sutural carinae very short and indistinct, median lobe of aedeagus with conspicuously broad and dagger-shaped cristal process. Isparta (Sultan Mountains) ............. ....................................................... G. perfodens Assing, 2011

- ♂: sutural carinae long and noticeable, median lobe of aedeagus with narrower cristal process. Afyonkarahisar (Ahır Mountains) ................................. G. ahirensis sp. nov.

Nomenclatural acts

This work and the nomenclatural acts it contains have been registered in ZooBank. The ZooBank Life Science Identifier (LSID) for this publication is urn:lsid:zoobank.org:pub:962E2A71-F401-4F23-8569-D5D7F93052D3 and for the new species are urn:lsid:zoobank.org:act:5896D5EF-E60E-4676-B9D0-EF0A9313B52A , urn:lsid:zoobank.org:act:CCCA4410-E446-456E-83C3-DEADE74112DD , and urn:lsid:zoobank.org:act:04A2BD2A-A4CE-4000-BA93-1D59638001D1 .

Acknowledgments

The authors are thankful to Dr. Ersen A. Yağmur for making his staphylinid collection available to us and also

Figures

Figure 1. Distributions ofG. ahirensis sp. nov. (open circle);G.sandiklica sp. nov. (open square);G.karakusensis sp. nov. (open triangle); G. fodens Assing, 2011 (filled triangle); G. perfodens Assing, 2011 (filled circle); G. burdurica Assing, 2011 (filled square); and G. akiana Assing, 2011 (filled star).

Figure 4. Details of Geostiba karakusensis sp. nov. A) Male forebody; B) female forebody; C) male abdomen in dorsal view; D) head in lateral view; E) male elytra in lateral view; F) male abdomen in lateral view; G) male abdominal tergite VII in dorsal view; H) male abdominal sternite VIII in dorsal view; I) aedeagus in lateral view; J) aedeagus in ventral view; K) spermatheca. Scale bars: 0.5 mm for A–C, F and 0.1 mm for D, E, G–K.