Insect | Definition, Characteristics, Types, Beneficial, Pest ...
4 天之前 · 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 - Thorax, Wings, Legs | Britannica
4 天之前 · Each leg always consists of five parts: a coxa articulated to the thorax, a small trochanter, a femur, a tibia, and a tarsus with one to five segments. The tarsal segments often carry claws with adhesive pads between them (arolia or pulvilli); these enable the insect to hold onto smooth surfaces.
insect - Kids | Britannica Kids | Homework Help
Insects also have at least one pair of antennas, or feelers. The three major segments of an insect body are the head, the thorax, and the abdomen. The head contains the insect’s antennas, mouthparts, and eyes.
Classification of insects | Britannica
Insect bodies have three segments: head, thorax (which bears three pairs of legs and usually two pairs of wings), and many-segmented abdomen. Many species undergo complete metamorphosis. There are two subclasses: Apterygota (primitive, wingless forms, including silverfish and bristletails) and Pterygota (more advanced, winged or secondarily ...
Description, Anatomy, Habitat, Life Cycle, & Facts - Britannica
2024年9月6日 · dragonfly, (suborder Anisoptera), any of a group of roughly 3,000 species of aerial predatory insects most commonly found near freshwater habitats throughout most of the world. Damselflies (suborder Zygoptera) are sometimes also called dragonflies in that both are odonates (order Odonata ).
Insect - Orders, Morphology, Behavior | Britannica
4 天之前 · 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.
list of insects - Encyclopedia Britannica
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 …
Insect - Adaptation, Metamorphosis, Diversity | Britannica
4 天之前 · 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.
Butterfly | Life Cycle, Classification, & Facts | Britannica
2024年9月23日 · butterfly, (superfamily Papilionoidea), any of numerous species of insects belonging to multiple families. Butterflies, along with the moths and the skippers, make up the insect order Lepidoptera. Butterflies are nearly worldwide in their distribution.
Insect - Nerves, Sensory Organs, Reflexes | Britannica
2024年9月13日 · Insect - Nerves, Sensory Organs, Reflexes: The central nervous system consists of ganglia that supply nerves to successive body segments. Their eyes are of two kinds, simple (ocelli) and compound eyes. The most primitive insects known are fossils of …