Morphological characteristics of Dashan longhorn beetle (the largest beetle in China)

The body is huge, body length: 63-110 mm. Body width: more than 20 mm, it is the largest beetle in my country. The body color is dark brown-red to tan, and the head, chest and antennae are dark in color, sometimes dark brown; there are very fine short yellow hairs on both sides of the head. The tentacles extend approximately to the middle of the elytra, with small engraved dots on them. The third and fourth segments are more densely distributed. There are slight denticles below the third to fifth segments. The shank segment is thick. The third segment is equal to the fourth and fifth segments. The total length of the fourth section is almost the same length as the shank section. The front chest and back are wide, with a significant bulge in the center; there are sharp serrations of uneven sizes on the edges of both sides, the front corner tooth is the largest, and its tip is bent toward the rear, and the rear corner teeth are also longer and sharper, slightly bent backward; the surface is smooth, with Six yellow pink hair spots, the two in the center are larger. The scutes are densely covered with yellow pink hairs. The elytra are slightly wider than the prothorax; the sides are slightly turned up, the ends are slightly narrower, the front center is high, the surface is very smooth, fine leathery texture and covered with short gray-yellow hairs; the rear edge is rounded, and the inner edge is pointed. thin. The center of the ventral surface is extremely bright and the spots are sparse; both sides are densely hairy and the spots are also very fine. The claw segment of the foot is almost equal to the sum of the lengths of the other three segments.

The male has a hairy head, a very thick upper jaw, and bifurcations at the tip and above. The antennae are thick and long, extending approximately to the end of the elytra. Each section from the third to the end is rough and granular on the top, and densely covered with fine teeth on the bottom. There is no female luster on the surface of the pronotum. The six pink hair spots are slightly dimpled and nearly parallel on both sides. The serrations are extremely small except for the front horn teeth. The base of the elytra is almost as wide as the front and back of the thorax.

Host plant: Quercus mongolica. Distributed in Northeast my country, Siberia, North Korea and other countries.

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