Eodorcadion intermedium intermedium (Jakovlev, 1889)

Karpinski, Lech, Szczepanski, Wojciech T., Boldgiv, Bazartseren & Walczak, Marcin, 2018, New data on the longhorn beetles of Mongolia with particular emphasis on the genus Eodorcadion Breuning, 1947 (Coleoptera, Cerambycidae), ZooKeys 739, pp. 107-150 : 122-123

Eodorcadion intermedium intermedium (Jakovlev, 1889) Figs 4F-I , 13C-F

Material examined.

Bayankhongor Aimag: 35 km SE of Bumbugur [ Бөмбөгөр] (45°59'N, 99°50'E), 1598 m a.s.l., 16 VIII 2015, 3♂♂, 1♀ (including dead specimens), leg. MW; 1♀ (dead), leg. LK; 20 km NEE of Bogd [ Богд] (45°17'N, 101°02'E), 1298 m a.s.l., 17 VIII 2015 , 9♂♂, 3♀♀ (including dead specimens), leg. MW; 3♂♂, 2♀♀, leg. WTS; 7♂♂, 1♀ (including dead specimens; all with reddish antenna), leg. LK; 20 km SE of Bogd [ Богд] (45°05'N, 101°08'E), 1263 m a.s.l., 18 VIII 2015 , 1 dead imago, leg. LK; Oevoerkhangai Aimag : 10 km W of Baruunbayan-Ulaan [ Баруунбаян-Улаан] (45°08'N, 101°14'E), 1264 m a.s.l., 18 VIII 2015 , 2♂♂, leg. WTS; 5 km W of Baruunbayan-Ulaan [ Баруунбаян-Улаан] (45°10'N, 101°17'E), 1266 m a.s.l., 18 VIII 2015 , 11♂♂, 12♀♀, leg. MW; 4♂♂, 2♀♀ (specimens with black antenna (Fig. 13D )), leg. WTS; 4♂♂, 2♀♀ (most specimens with black antenna), leg. LK.

Remarks.

The species is widespread in the southern parts of Mongolia, where it is divided into two subspecies. The nominative subspecies is distributed in the western part of its range, where it occurs in many localities mainly in Bayankhongor and Gobi-Altaj Aimags. According to Danilevsky (2007), this taxon is characterised by a great deal of individual and geographical variability. We also observed elytral stripes - similar to E. intermedium kozlovi (Suvorov 1912) - and antennal colour variations, even in the case of specimens that were collected from the same locality. The species seems to have the ability to adapt to a wide range of ecological conditions; we observed it in various localities in high-grass enclaves, steppe and semi-desert habitats (Fig. 13G, H ). The males (Fig. 13C ) were primarily collected at different times of the day during rather cloudy (occasional shower) and cold (15-20 °C) weather; only a few pairs were copulating (Fig. 13F ). Many specimens were already dead, which indicates the end of the appearance of this species. According to Danilevsky (2007), E. intermedium is ecologically associated with Lasiagrostis . At one of the localities, we found the remains of imago in a bird’s pellet (Fig. 14A ).

Figures

Figure 4. Photos of longhorn beetles specimens collected during the expedition to Mongolia in 2015: A Eodorcadion maurum australe (female) B Eodorcadion oryx (male) C E. oryx (female) D Eodorcadion exaratum argali (male) E E. exaratum argali (female) F Eodorcadion intermedium intermedium (male, reddish form) G E. intermedium intermedium (male, intermediate form) H E. intermedium intermedium (male, blackish form) I E. intermedium intermedium (female, reddish form).

Figure 13. Field photos of imagines in nature and habitats of typical Mongolian cerambycid species: A tuft of needlegrass Achnatherum splendens, the possible host plant of larvae of Eodorcadion consentaneum B adults emergence holes of E. consentaneum in the sand C male of Eodorcadion intermedium intermedium (reddish form) D male of Eodorcadion intermedium intermedium (blackish form) E female of E. intermedium intermedium (reddish form) F pair of E. intermedium intermedium in copula G steppe in Baruunbayan-Ulaan environs, one of the habitat types of E. intermedium intermedium H semi-desert in Bogd environs, one of the habitat types of E. intermedium intermedium.

Figure 14. Field photos of imagines in nature and habitats of typical Mongolian cerambycid species: A remains of imago of Eodorcadion intermedium intermedium in a bird's pellet B male of Eodorcadion oryx C female of E. oryx D periphery of a drying lake with a mix of high and low grass, the habitat of E. oryx and Eodorcadion humerale impluviatum E detailed view of the habitat of E. oryx and E. humerale impluviatum F female of Eodorcadion exaratum argali G female of E. exaratum argali under cow dung H pasture with low grass and herbs in Ulaanshiveet environs, the habitat of E. exaratum argali.