Eodorcadion humerale impluviatum (Faldermann, 1833)

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 : 124-125

Eodorcadion humerale impluviatum (Faldermann, 1833) Figs 2D-G , 15A-D

Material examined.

Töv Aimag: 80 km NE of Ulaanbaatar [ Улаанбаатар] (48°13'N, 107°43'E), 1778 m a.s.l., 31 VII 2015, 17♂♂, 7♀♀, leg. MW; 9♂♂, 4♀♀, leg. LK; 11♂♂, 1♀, leg. WTS (exclusively smaller and darker forms); Bayankhongor Aimag : 35 km SE of Bumbugur [ Бөмбөгөр] (45°59'N, 99°50'E) , 1598 m a.s.l., 16 VIII 2015, 9♂♂, 7♀♀, leg. MW; 4♂♂ (including 3 dead specimens), leg. WTS; 3♂♂, 1♀, leg. LK (exclusively yellow coloured forms); 33 km S of Nariinteel [ Нарийнтээл]; (45°39'N, 101°22'E) , 1626 m a.s.l., 17 VIII 2015, 1♂ (dead specimen), leg. MW; 1♀ (dead specimen), leg. LK; 10 km S of Khairkhandulaan [ Хайрхандулаан] (45°48'N, 101°59'E) , 1748 m a.s.l., 18-19 VIII 2015, 2♂♂, leg. LK; 1♂, leg. MW; 1♂, leg. WTS.

Remarks.

This widespread species, which contains three subspecies, is distributed in Russia from Transbaikalia to the Pacific Ocean in the Primorsky region, in the central and north-eastern parts of Mongolia and in north-eastern China. Eodorcadion humerale humerale is limited to the territory of Mongolia, where it has many known localities in the areas of Bayankhongor Aimag and Ulaanbaatar ( Danilevsky 2007).

This taxon was observed sympatrically with other Eodorcadion species, i.e., E. intermedium and E. oryx , in steppe habitats (Fig. 14D ) that had tufts of high grass (inter alia Achnatherum splendens ). In addition to the typical form (Fig. 15A ), that was collected in most of the presented localities, in the Khentey Mountains, we found a specific population characterised by a definitely smaller body size and by elytra covered with fewer white spots of hairs (sometimes almost completely black) (Fig. 15B-D ). This population inhabits a xerothermic slope with a rich plant community on the edge of a larch woodlot in a forest-steppe habitat (Figs 10E , 15E ). During rather cloudy weather before a storm, some specimens were still active and copulating (Fig. 15D ) in the afternoon hours (about 1 p.m.). On the same plot, we also observed approximately ten specimens of E. carinatum involvens and one female of Monochamus impluviatus impluviatus . Due to the considerable dissimilarity in body size and type of biotope, this population requires further research and possibly represents a transitional form between two subspecies ( E. h. impluviatum and E. h. humerale ).

Figures

Figure 2. Photos of longhorn beetles specimens collected during the expedition to Mongolia in 2015: A Clytus arietoides (female) B Xylotrechus hircus (male) C X. hircus (female) D Eodorcadion humerale impluviatum (male) E E. humerale impluviatum (female) F E. humerale impluviatum (male, Khentey Mountains) G E. humerale impluviatum (female, Khentey Mountains) H Eodorcadion carinatum involvens (male) I E. carinatum involvens (female).

Figure 10. Field photos of imagines in nature and habitats of typical Mongolian cerambycid species: A male of Eodorcadion carinatum involvens B female of E. carinatum involvens C female of E. carinatum involvens (white pubescence form) D steppe in Ulaanbaatar environs, the habitat of E. carinatum involvens E xerothermic mountain slopes, the habitat of E. carinatum involvens and Eodorcadion humerale impluviatum F male of Eodorcadion maurum australe G female of E. maurum australe H short grass meadow in Zereg environs, the habitat of E. maurum australe.

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.

Figure 15. Field photos of imagines in nature and habitats of typical Mongolian cerambycid species: A male of Eodorcadion humerale impluviatum (typical form) B male of E. humerale impluviatum (Khentey Mountains) C male of E. humerale impluviatum (Khentey Mountains, entirely black elytra form) D pair of E. humerale impluviatum in copula (Khentey Mountains) E detailed view of the habitat of E. humerale impluviatum (Khentey Mountains) F female of Monochamus impluviatus impluviatus G larches in forest steppe, the habitat of M. impluviatus impluviatus H various species of coniferous trees and birches in dark taiga, the habitat of Monochamus sartor urussovii.