Geostiba (Tropogastrosipalia) yamani, 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 : 286-288

Geostiba (Tropogastrosipalia) yamani sp. n.

( Figs. 1, 2 , 5−10 , 17 )

urn:lsid:zoobank.org:act:14357A56-8E69-4A4E-9469-F1270D93379A

Type material. Holotype: Turkey: ♂, “TR. Tokat Province, Reşadiye District , 2 km SW Özlüce, 1600 m, 40°18’18”N, 37°24’53”E, 06.IV.2022, leg. Örgel, Kacar & Çelik. / Holotypus ♂, Geostiba (Tropogastrosipalia) yamani sp. n. det. S. Örgel 2022” ( AZMM) . Paratypes: 4 ♂♂, 15 ♀♀, same data as holotype ( AZMM) . 1 ♂, 2 ♀♀, Tokat Province, Almus District , 5 km SW Bağtaşı, 1990 m, 40°12’48”N, 37°18’28”E, 15.IV.2018, leg. Anlaş, Örgel & Yaman ( AZMM) .

Description. Measurements (in mm) and ratios (range, n = 23): AL: 0.60–0.64, 0.62; HL: 0.21–0.29, 0.25; HW: 0.24–0.28, 0.25; PL: 0.35–0.39, 0.37; PW: 0.31–0.36, 0.33; EL: 0.15–0.18, 0.17; EW: 0.38–0.43, 0.40; AW: 0.51–0.57, 0.55; ML: 0.21–0.24, 0.23 (n=6); FL: 0.70–0.82, 0.77; TL: 1.96–2.11, 2.00; HL/HW: 0.87–1.03, 1.00; PW/HW: 1.29–1.30, 1.32; PW/PL: 0.89–0.92, 0.89; EL/PL: 0.43–0.46, 0.46; EW/PW: 1.19–1.23, 1.21; EL/EW: 0.39–0.42, 0.42; AW/EW: 1.33–1.34, 1.34.

MALE. Body 2.0 mm. Head and abdomen blackish; pronotum, elytra and antennae reddish-brown; legs yellowish-brown.

Head 1.00 times as wide as long(see ratio HL/HW), with superficial and very sparce punctation, microreticulation fine; eyes small, slightly protruding from lateral outline of head, 1/3 as long as postocular region ( Figs. 1–2 ).

Pronotum weakly oblong and distinctly wider than head (see ratios PW/PL and PW/HW); widest in anterior third portion, weakly narrowed along two-thirds and sharply narrowed in the posterior third ( Figs. 1–2 ), posterior margin convex in the middle ( Fig. 5 ); punctation and microreticulation more distinct than that of head.

Elytra distinctly shorter than pronotum, and widened posteriad, approximately 1.2 times as wide as pronotum ( Figs. 1–2 and see ratios EL/PL, EW/PW); microsculpture less distinct than that of pronotum; punctation distinctly granulose ( Fig. 5 ); without sutural carina; postero-laterally with oblique impressions; lateral margins sharply angled in the middle ( Fig. 6 ).

Abdomen wider than elytra (see ratio AW/EW), widest at segment VI;punctation large and sparse; microsculpture present, composed of dense and fine transverse meshes and striae; only tergites VII modified; process of tergite VII short and stout in lateral view ( Fig. 7 ), wide and acute apically in dorsal view ( Fig. 8 ); sternite VIII unmodified.

Median lobe of aedeagus approximately 0.23 mm and as in Figure 9 .

FEMALE. Similar to male except for the secondary sexual characters and as follows. Pronotum approximately as wide as long, posterior margin broadly convex; abdominal tergite VII unmodified; spermatheca as in Figure 10 .

Comparative notes. This new species is distinguished from all its consubgeners by the male primary and secondary sexual characters.The type localities of the G. yamani Örgel , sp. n. and G. priva Assing, 2006 are separated by a valley (details are explained in the distribution and bionomics). These species can be distinguished from by the following morphological features: in G. yamani sp. n. the posterior margin of the male pronotum is convex in the middle, whereas in G. priva the posterior margin of the male pronotum is weakly pointed in the middle. G. yamani sp. n. does not have sutural carina on the male elytra, but in G. priva the male elytra have moderately elevated sutural carina. The process of the male abdominal tergite VII in G. yamani sp. n. is wider than that of G. priva . The crista apicalis process of the median lobe of aedeagus is dagger-shaped in G. yamani sp. n., but it is slender and needle-shape in G. priva . Additionally, based on the shape of crista apicalis process of the median lobe of aedeagus, G. yamani sp. n. is most similar to G. solodovnikovi Assing, 2006 (dagger-shaped in both species), described from the Erzurum Province ( Assing, 2006), from which it differs by sutural carina on the male elytra, anterior abdominal tergites and by process of abdominal tergite VII. G. yamani sp. n. does not have sutural carina on the male elytra, but in G. solodovnikovi the male elytra have weakly elevated sutural carina. Anterior abdominal tergites are unmodified in G. yamani sp. n., whereas abdominal tergites III and IV have a median tubercle in G. solodovnikovi . The process of the male abdominal tergite VII in G. yamani sp. n. is wider than that of G. solodovnikovi ( Table 1 ).

Etymology. Patronymic, the species is named to honour Serkan Yaman of Manisa, Turkey.

Distribution and bionomics. The new species is known only from the type locality in the Reşadiye and Almus District (Tokat Province), in the Middle Blacksea Region ( Fig. 17 ). The mountain range where the type locality is located is geographically the transition zone between Central Anatolia (Sivas Province) and the Middle Blacksea regions (Tokat Province). This mountain ranges is separated from Giresun Mountains, which is the type locality of G. priva , the morphologically most similar species, by the Kelkit Valley. Therefore, the new species is probably endemic in this mountain range surrounded by the Yeşilırmak River and its tributaries.

Bionomics. The specimens were collected under stones in meadows at elevation 1990 m. The detailed ecological data are unknown.

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).