*Add to Science Notebook Name 1 Arthropods, Ch. 13, pg. 374-382 Characteristics of Arthropods *Arthropods are the largest group of animals. *Arthropods have jointed and include,,, and. *Arthropod appendages are adapted for capturing prey, feeding, mating, and sensing their environment. *Arthropods have: Segmented Bodies *The bodies of arthropods are divided into. *Some arthropods have many segments. Others have segments fused together to form body regions, such as those of insects, spiders, and crabs. Exoskeletons *All arthropods have a hard outer covering called an. *Exoskeletons,, and the internal body and provides place for muscles to attach. *An exoskeleton cannot grow as the animal grows. *From time to time, the exoskeleton is shed and replaced by a new one in a process called. Arthropods *Arthropods include insects, arachnids, centipedes and millipedes, and crustaceans. Insects *There are more than 700,000 species of insects. *Insects have three body regions,, and.
*Add to Science Notebook Name 2 Insects- Head *A insects head has a pair of,, and. *The antennae is used for and. *The eyes are or. -Simple eyes detect light and darkness. -Compound eyes have many lenses and detect colors and movements. *The mouthparts of insects vary. Insects- Thorax *An insect s thorax contains and (if the insect has wings). *Insects are the only invertebrate animal that can fly. *Flying allows insects to,, and. Insect- Abdomen *An insect s abdomen contains reproductive structures. *Females lay thousands of eggs, but only a fraction develop into adults. Insect Characteristics *Insects have an that carries digested food to cells and removes wastes. *Insect blood does not carry oxygen because it does not contain hemoglobin. *Insects have openings called on the abdomen and thorax through which gas exchange occurs. Insect Life Cycle *Metamorphosis is. *Metamorphosis can be and. *Complete metamorphosis includes 4 stages,,, and. *Insects that undergo complete metamorphosis are: butterflies, beetles, ants, bees, moths, and flies. *Incomplete metamorphosis includes 3 stages:,, and. *Examples include: grasshoppers, silverfish, lice, and crickets.
*Add to Science Notebook Name 3 Insects- Obtaining Food *Insects feed on plants, the blood of animals, nectar, decaying materials, wood in houses, and clothes. *Mouthparts are very diverse. *Grasshoppers and ants have large mandibles for chewing plant tissue. *Butterflies and honeybees have siphons for lapping up nectar in flowers. *Mosquitoes have mouths that are adapted for piercing skin and sucking blood. Insect Success *Insects are extremely successful because of their ; ; ; and. Arachnids *Examples of Arachnids include: scorpions, spiders, mites and ticks. *Arachnids have two body regions a and a region called the. *Arachnids have 4 pairs of legs and no antennae. *Many arachnids are adapted to kill prey with poison glands, stingers or fangs. Scorpions *Scorpions are. *Scorpions have a pair of well-developed appendages with which they grab their prey. Spiders *Spiders cannot chew their food, so they release enzymes into their prey that help digest it. *Gases are exchanged in. Openings in the abdomen allow the gases to move into the book lungs. Mites *Most mites are plant and animal parasites. *However, some are not parasites. Some mites live in the follicles of human eyelashes. *Most mites are so small that they look like tiny specs of dust.
*Add to Science Notebook Name 4 Ticks *All ticks are. *Ticks attach to their hosts through specialized mouthparts. *Ticks often carry and that can cause disease in other animals. Centipedes and Millipedes *Centipedes and Millipedes have: *They can be found in damp environments, including,, and. *Centipedes and millipedes reproduce sexually. *They make nests for their eggs and stay with them until they hatch. *Centipedes hunt for prey, which include snails, slugs, and worms. *Millipedes feed on plants and decaying material. Crustaceans *Crustaceans include crabs, crayfish, shrimp, barnacles, pill bugs, and water fleas. *Crustaceans have, which are used for crushing food. *Most crustaceans live in water, except for pill bugs, which live in damp soil. *Crustaceans have five pairs of legs. -The first pair are. -The other four pairs are. *Crustaceans have 5 pairs of appendages called. *Swimmerets help with movement and reproduction. *Crustaceans have for gas exchange. *Crustaceans can also regenerate appendages. Value of Arthropods *Arthropods are a source of food for many animals. *Insects pollinate crops which help produce food for humans. *Arthropods produce products for humans like silk and honey.
*Add to Science Notebook Name 5 Harmful Arthropods *Arthropods can be pests and destroy food, clothing and property. *Many arthropods such as mosquitoes, tsetse flies, fleas, and ticks carry diseases. Controlling Insects *One common way to control insects is insecticides. *However many insecticides kill helpful insects as well as harmful ones. *Insecticides can also pollute the environment.