Insect, any member of the class Insecta, the largest class of phylum Arthropoda. Insects have segmented bodies, jointed legs, and exoskeletons. They are distinguished from other arthropods by their body, which has three major regions: the head, the three-segmented thorax, and the many-segmented abdomen.

insect, Any member of the class Insecta, the largest arthropod class, including nearly 1 million known species (about three-fourths of all animals) and an estimated 5–10 million undescribed species.

Insect - Orders, Morphology, Behavior: The class Insecta has about 1,000,000 named species and is divided into the subclasses Apterygota and Pterygota. The homopteran and heteropteran orders are sometimes considered suborders of an order Hemiptera.

2025年2月6日 · Insects (class Insecta) have segmented bodies, jointed legs, and external skeletons. Insects are distinguished from other arthropods by their body, which is divided into three major regions: (1) the head, which bears the mouthparts, eyes, and a pair of antennae, (2) the three-segmented thorax,

Insect - Diversity, Adaptations, Habitats: Insects have adapted to every land and freshwater habitat where food is available. Their large populations and great variety are related to their small size, high reproduction rate, and abundant food supplies. Insects play many important roles in nature, including decomposition, soil formation, and pollination. Certain insects can be of direct …

Insect evolution has paralleled that of the flowering plants. Insects exhibit a balanced genetic polymorphism. The class Insecta is divided into orders based on the structure of the head, thorax, abdomen, type of metamorphosis, and form of larva and pupa.

Insect - Adaptation, Metamorphosis, Diversity: Most insects begin their lives as fertilized eggs. The hatching of young larvae is achieved in several ways. Insects undergo one of two types of metamorphosis: incomplete or complete. Larvae vary considerably in shape and are classified in five forms: eruciform, scarabaeiform, campodeiform, elateriform, and vermiform.

Apterygote - Insects, Arthropods, Hexapods: Apterygotes differ from pterygotes in lacking wings and undergoing simple metamorphosis. The orders Zygentoma, Archaeognatha, and extinct Monura are placed in the subclass Apterygota in class Insecta. The three classes Protura, Collembola, and Diplura, had previously been treated as orders.

2025年2月27日 · The typical life cycle requires about four weeks, so that several generations are produced each summer. Female ladybugs lay their eggs on leaves or twigs where aphids or other prey are feeding. When the eggs hatch, the larvae feed upon aphids, scale, or insect eggs using chewing mandibles.The long, slender, soft-bodied larvae are usually gray with blue, green, …

2025年3月28日 · The eggs are laid on the surface of water and hatch into aquatic larvae, or wrigglers, which swim with a jerking, wriggling movement.In most species, larvae feed on algae and organic debris, although a few are predatory and may even feed on other mosquitoes. Unlike most insects, mosquitoes in the pupal stage, called tumblers, are active and free-swimming.