Seven-spotted ladybug body length is 6.5~7.5mm. The elytra are red, with 3 black spots on the left and right sides, and a larger black spot in front of the joint. No similar species.
Female: Body length 5.70-7 mm, width 4-5.60 mm, hemispherical, smooth and hairless back. When it first emerges, the elytra are bright yellow and soft. After 3 to 4 hours, they gradually change from yellow to orange-red. At the same time, 7 black spots appear on the two elytra. The one below the small scute is a small scute, and the small scute is seamed by the sheath. Split in half. In addition, there are 3 black spots on each elytra, and 1 small triangular white spot on each side of the small scutellum at the base of the elytra. The head is black, and there is a light yellow spot on each edge connecting the forehead and the compound eyes. There are two small light yellow spots between the compound eyes, sometimes connected to the above-mentioned yellow spots. The antennae are chestnut brown, slightly longer than the width of the forehead, with tight hammer joints, straight side edges, and truncate at the end. There is a narrow yellow strip on the front edge of the lip base, the upper lip and mouthparts are black, and the outside of the upper jaw is yellow. The pronotum is black, and there is a nearly quadrilateral light yellow spot on each front corner. Scutum black. The anterior thorax and abdominal plate are narrow and sunken, with longitudinal ridge lines and posterior baseline branches. The legs are black, with 2 spines on the tibia and basal teeth on the claws. The ventral surface is black, but the middle and posterior sides of the thorax are white. The posterior edge of the sixth abdominal segment is convex and the surface is flat.
Male: The posterior edge of the sixth abdominal segment is truncated, there is a transverse depression in the middle, and there is a row of long hairs on the upper edge.
Egg: 1.26 mm long; 0.60 mm wide. Orange-yellow bun, long oval, pointed at both ends. Standing in piles on the underside of cotton leaves. Each egg usually contains 20 to 40 eggs, with a maximum of 80 eggs.
Larvae: 4 instars in total. Main characteristics of each instar:
First instar: body length 2-3 mm. The body is all black. From the midthorax to the eighth abdominal segment, each segment has 6 hairy warts.
Second instar: body length 4 mm. The head and feet are all black, and the body is gray-black. The left and right rear corners of the front chest are yellow. There are 6 spiny warts on the back and sides of each abdominal segment. The two spiny warts on the left and right sides of the back of the first abdominal segment are yellow and have black spines. The yellow spots on the back of the fourth abdominal segment are not visible. The remaining warts are black.
Third instar: body length 7 mm. The body is gray-black. The head, feet, back plate of the chest and the bottom buttock plate of the abdomen are black. There are yellow spots on the anterior and posterior corners of the pronotum. The thorn warts on the left and right sides of the first section of the abdomen and the thorn warts on the lower side are orange with black thorns. 2 thorn warts on the dorsal side of the fourth segment are slightly yellow, and the remaining thorn warts are black.
Fourth instar: body length is about 11 mm. Body gray-black. There are orange spots on the anterior and posterior corners of the pronotum. There are orange spots on the left and right lateral thorn warts and on the lower lateral thorn warts in the first and fourth sections of the abdomen. The remaining warts are black.
Pupa: Body length 7 mm, width 5 mm. Body yellow. There are 4 black spots on the front edge of the pronotum, and 2 are triangular in the center. There are 2 black spots in the center of the posterior edge of the pronotum, and 2 black spots on the corners on both sides. There are 2 black spots on the mid-thorax. There are 4 black spots on the left and right sides of the 2nd to 6th section of the abdomen. The end of the abdomen contains the black molted skin of the last instar larvae.
This is a beautiful and lovely simple drawing of a seven-star ladybug. It is simple and easy to understand, suitable for children to learn.
