Geostiba (Tropogastrosipalia) sinananlasi, Örgel, 2022

Örgel, Semih, 2022, Two new species and additional records of the genus Geostiba Thomson, 1858 (Coleoptera: Staphylinidae: Aleocharinae) from Turkey, Zootaxa 5178 (3), pp. 285-292 : 289-290

Geostiba (Tropogastrosipalia) sinananlasi sp. n.

( Figs. 3, 4 , 11−17 )

urn:lsid:zoobank.org:act:2676DD3C-3591-4EFD-8FB6-CD03EC659208

Type material. Holotype: Turkey: ♂, “TR. Sivas Province, Divriği District , 2 km S Uluçayır, 1830 m, 39°11’45”N, 37°59’26”E, 19.IV.2018, leg. Anlaş, Örgel & Yaman / Holotypus ♂ Geostiba (Tropogastrosipalia) sinananlasi sp. n. det. S. Örgel 2022” ( AZMM) . Paratype: 1♀, same locality and date as holotype ( AZMM) .

Description. Measurements (in mm) and ratios (range, n = 2): AL: 0.73–0.75, 0.74; HL: 0.27; HW: 0.28; PL: 0.36–0.39, 0.38; PW: 0.33–0.36, 0.35; EL: 0.17–0.21, 0.19; EW: 0.38–0.43, 0.41; AW: 0.56–0.61, 0.59; ML: 0.26 (n=1); FL: 0.79–0.81, 0.80; TL: 2.13–2.28, 2.21; HL/HW: 0.95; PW/HW: 1.17–1.28, 1.23; PW/PL: 0.92; EL/PL: 0.47–0.54, 0.51; EW/PW: 1.15–1.19, 1.17; EL/EW: 0.45–0.49, 0.47; AW/EW: 1.42–1.47, 1.45.

MALE. Body 2.2 mm. Head dark brown; pronotum and antennae reddish-brown; elytra and legs yellowishbrown; abdomen blackish.

Head weakly transverse, 0.96 times as long as wide (see ratio HL/HW), punctation and microreticulation fine; eyes slightly projecting from lateral outline of head, approximately 1/3 as long as postocular region ( Figs. 3–4 ).

Pronotum approximately as wide as long and wider than head (see ratios PW/PL and PW/HW); gradually narrowing from its widest point at middle towards posterior, but more distinctly narrowed in the posterior third ( Figs. 3–4 ), posterior margin weakly pointed in the middle ( Fig. 11 ); punctation and microreticulation more pronounced than that on the head.

Elytra shorter and wider than pronotum (see ratios EL/PL, EW/PW); microsculpture less distinct than that of pronotum; punctation slightly granulose ( Fig. 11 ); sutural carina weakly elevated, extending about 1/3 length of elytral suture ( Fig. 12 ); postero-laterally with oblique impressions; lateral margins distinctly angled in the middle.

Abdomen wider than elytra (see ratio AW/EW); punctation large and sparse; microsculpture present, composed of dense and fine transverse meshes and striae; anterior abdominal tergites and sternite VIII unmodified; process of tergite VII tall and strong in lateral view ( Fig. 13 ), wide at base and acute apically in dorsal view ( Fig. 14 ).

Median lobe of aedeagus approximately 0.26 mm and as in Figure 15 .

FEMALE. The differences from male are as follows. Pronotum slightly shorter than that in male, approximately as wide as long, posterior margin broadly convex, elytra without sutural carina; abdominal tergite VII unmodified; spermatheca as in Figure 16 .

Comparative notes. G. sinananlasi Örgel , sp. n. is readily separated from other Turkish Tropogastrosipalia by thick and strong crista apicalis process of the median lobe of aedeagus. The type localities of the G. sinananlasi sp. n. and G. solodovnikovi are separated geographically by a valley (details are explained in the distribution and bionomics). These species can be distinguished by the following morphological features: in G. sinananlasi sp. n. the posterior margin of the male pronotum is weakly pointed in the middle, whereas in G. solodovnikovi the posterior margin of the male pronotum is concave in the middle. Sutural carina on the male elytra are weakly elevated in both species, but carina in G. sinananlasi sp. n. is shorther than that of G. solodovnikovi . The crista apicalis process of the median lobe of aedeagus is thick and strong in G. sinananlasi sp. n., but it is dagger-shaped in G. solodovnikovi . Additionally, regarding the shape of the posterior margin of the male pronotum, G. sinananlasi sp. n. is most similar to G. priva (weakly pointed in both species), from which it is easily distinguished by the sutural carina on the male elytra, process of abdominal tergite VII and the crista apicalis process of the median lobe of aedeagus. Sutural carina on the male elytra in G. sinananlasi sp. n. is positioned lower and is shorther than that of G. priva . The process of the male abdominal tergite VII in G. sinananlasi sp. n. is wider than that of G. priva . The crista apicalis process of the median lobe of aedeagus in G. sinananlasi sp. n. is thicker and stronger in G. priva ( Table 1 ).

Etymology. The species is named in honor of staphylinidologist Dr. Sinan Anlaş who have helped in the collection of some of the material used in this study.

Distribution. The type locality of the new species is eastern slopes of Tecer Mountains which is the one of the transition zone between Central Anatolia and the Eastern Anatolia Regions ( Fig. 17 ). On the west the Tecer Mountains are bordered by the Kızılırmak River Valley. At the eastern end of the this mountain ranges are the Fırat River Valley. The new species is most probably endemic in around the Tecer Mountains.

Bionomics. The specimens were collected under stones in meadows at elevation 1830 m. The detailed ecological data are unknown.

The key to related congeners in Assing (2006) is modified as follows:

1. ♂: anterior abdominal tergites unmodified.................................................................. 2

- ♂: anterior abdominal tergites III-IV each with median tubercle; posterior margin of pronotum occasionally truncate in the middle; sutural carina of elytra weakly elevated, extending along anterior half of suture; process of abdominal tergite VII slender in dorsal view; median lobe of aedeagus with dagger-shaped cristal process. (Erzurum; Assing, 2006: figs. 20–29).............................................................................. G. solodovnikovi Assing, 2006

2. ♂: posterior margin of pronotum weakly pointed in the middle................................................. 3

- ♂: posterior margin of pronotum convex in the middle; elytra without sutural carina; anterior abdominal tergites unmodified; process of abdominal tergite VII wide in dorsal view; median lobe of aedeagus with dagger-shaped cristal process. (Tokat; present paper: Figs. 1,2; 5–10)............................................................... G. yamani sp. n.

3. ♂: sutural carina of elytra weakly elevated, extending about 1/3 length of suture; process of abdominal tergite VII wide in dorsal view; median lobe of aedeagus with thick and strong cristal process. (Sivas; present paper: Figs. 3,4; 11–16)................................................................................................. G. sinananlasi sp. n.

- ♂: sutural carina of elytra moderately elevated, extending along anterior 2/3 of suture; process of abdominal tergite VII slender in dorsal view; median lobe of aedeagus with very slender, needle-shape cristal process. (Gümüşhane; Assing, 2006: figs. 78–84).............................................................................. G. priva Assing, 2006

Figures

FIGURE 17. Distribution of Geostiba yamani sp. n. (circles); G.sinananlasi sp. n. (square); G. priva (triangle); G. solodovnikovi (pentagon).

FIGURES 1–4. Geostiba yamani sp. n. (1,2) and G. sinananlasi sp. n. (3,4). 1,3—male habitus; 2,4—male forebody. Scale bars: 0.2 mm (Figs. 1−4).

FIGURES 5–16. Geostiba yamani sp. n. (5−10) and G. sinananlasi sp. n. (11-16). 5,11—posterior margin of male pronotum and elytra; 6,12—male elytra in lateral view; 7,13—posterior portion of abdominal segments of male in lateral view; 8,14— male abdominal tergite VII in dorsal view; 9,15—median lobe of aedeagus in lateral view; 10,16—spermatheca. Scale bars: 0.2 mm (Figs. 5−8 and 11−14); 0.1 mm (Figs. 9,10,15,16).