Eodorcadion carinatum involvens (Fischer von Waldheim, 1823)

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 : 119

Eodorcadion carinatum involvens (Fischer von Waldheim, 1823) Figs 2H, I , 10A-C

Material examined.

Töv Aimag: 60 km E of Ulaanbaatar (47°52'N, 107°39'E), 1499 m a.s.l., 30 VII 2015, 29♂♂, 13♀♀ (5♀♀ white pubescence form (Fig. 10C )), leg. MW; 20♂♂, 8♀♀ (2♀♀ white pubescence form), leg. WTS; 11♂♂, 10♀♀ (4♀♀ white pubescence form), leg. LK; 80 km NE of Ulaanbaatar (48°13'N, 107°43'E) , 1778 m a.s.l., 31 VII 2015, 3♂♂, 2♀♀, leg. MW; 1♂, 1♀, leg. WTS; 1♂, leg. LK; Selenge Aimag : 10 km NE of Zuunkharaa (48°54'N, 106°43'E) , 999 m a.s.l., 05 VIII 2015, 1♂, 1♀, leg. LK; 2♂♂, leg. MW; 2♂♂, 2♀♀, leg. WTS; 5 km E of Zuunkharaa (48°51'N, 106°36'E) , 916 m a.s.l., 05 VIII 2015, 1♂, 1♀, leg. WTS; 5 km W of Khötöl [ Хөтөл] (49°05'N, 105°29'E) , 809 m a.s.l., 06 VIII 2015, 1♂, 1♀, leg. LK; 1♂, leg. WTS; Arkhangai Aimag : 15 km S of Khairkhan (48°22'N, 101°52'E) , 1437 m a.s.l., 07 VIII 2015, 1♂, leg. LK; 5 km E of Khairkhan (48°37'N, 102°01'E) , 1398 m a.s.l., 07 VIII 2015, 1♀ (white pubescence form), leg. WTS.

Remarks.

Eodorcadion carinatum involvens is one of the five subspecies that have already been described; they are distributed from the Jenisei River to the Far East. This taxon is the most common and widespread in the northern and central parts of Mongolia where it has been recorded from many localities; to the south, it reaches the Mongolian and Gobi Altai Mountains. The imagines are active from the end of June to August ( Namhaidorzh 1972, Danilevsky 2007).

We observed a mass occurrence of this species (more than one hundred specimens) approx. 60 km E of Ulaanbaatar during moderately warm (22 °C) and cloudy weather conditions in the steppe habitat (Fig. 10D ) at the turn of July and August. Most of the specimens were found in the interstices of the grass where they were mating. Single specimens were walking slowly. Some specimens were also found at a higher elevation (1778 m a.s.l) on xerothermic mountain slopes (Fig. 10E ) sympatrically with Eodorcadion humerale impluviatum (Faldermann, 1833) and Monochamus impluviatus impluviatus (Motschulsky, 1859). Another plot, which was located approx. 15 km S of Khairkhan (48°22'N, 101°52'E), turned out to be the most westward locality of this taxon towards the city of Altai. Towards the Khangai Mountains, we did not find any further individuals despite checking numerous plots.

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.