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Transcript of BHMS-Arthropods
Arthropods also have bilateral symmetry, segmented bodies, an exoskeleton, a body cavity, a digestive system with two openings, and a nervous system.
The jointed appendages of arthropods can include legs, antennae, claws, and pincers.
There are more than a million different species of arthropods, (AR thruh pahdz). Exoskeleton All arthropods have a hard, outer covering called an exoskeleton.
It covers, supports, and protects the internal body and provides places 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 molting.
Insects More species of insects exist then all other animal groups combined.
Insects have three body regions—a head, a thorax, and an abdomen.
Head An insect’s head has a pair of antennae, eyes, and a mouth.
The eyes are simple or compound. Simple eyes detect light and darkness. Compound eyes contain many lenses and can detect colors and movement.
Thorax Three pairs of legs and one or two pairs of wings, if present, are attached to the thorax.
Insects are the only invertebrate animals that can fly.
Abdomen Insects have openings called spiracles (SPIHR ih kulz) on the abdomen and thorax through which air enters and waste gases leave the insect’s body.
Insects have an open circulatory system that carries digested food to cells and removes wastes.
The abdomen is where the reproductive structures are found.
Many insects go through changes in body form called metamorphosis (me tuh MOR fuh sihs).
Grasshoppers, silverfish, lice, and crickets undergo incomplete metamorphosis.
Many insects—butterflies, beetles, ants, bees, moths, and flies—undergo complete metamorphosis.
The stages of complete metamorphosis are egg, larva, pupa, and adult. Arachnids Spiders, scorpions, mites, and ticks are examples of arachnids (uh RAK nudz).
They have two body regions—a head-chest region called the cephalothorax (se fuh luhTHOR aks) and an abdomen.
Arachnids have four pairs of legs but no antennae.
Many arachnids are adapted to kill prey with venom glands, stingers, or fangs. Others are parasites. Because spiders can’t chew their food, they release enzymes into their prey that help digest it, then sucks it back into its mouth.
Centipedes & Millipedes Centipedes and millipedes reproduce sexually. They make nests for their eggs and stay with them until the eggs hatch.
Two groups of arthropods—centipedes and millipedes—have long bodies with many segments and many legs, antennae, and simple eyes.
Centipedes hunt for their prey, which includes snails, slugs, and worms.
They have a pair of venomous claws that they use to inject venom into their prey.
One pair of legs per body segment
Millipedes feed on plants and decaying material and often are found under the damp plant material.
Two pair of legs per body segment
Crustaceans Crabs, crayfish, shrimp, barnacles, pill bugs, and water fleas are crustaceans.
Crustaceans have one or two pairs of antennae and mandibles, which are used for crushing food.
Crustaceans have five pairs of legs.
If a crustacean loses an appendage, it will grow back, or regenerate.