Download Notes Chapter #8

Chapter #8
Insects
Crayfish
Chapter 8.1 Notes
• Jointed-leg animal is an invertebrate with
an exoskeleton, bilateral symmetry, and
jointed appendages.
• Appendage is a structure that grows out of
an animals body. Examples legs, wings,
antennae.
• 80% of animals are jointed-leg animals.
• Molting- the shedding of the exoskeleton.
• Antennae- appendages of the head that
are used for sensing smell and touch.
• Compound eyes- eyes with many lenses.
• Simple eyes- eyes with only 1 lens.
5 classes of jointed-leg animals
1. Crayfish, lobsters, crabs, pill bugs.
• 5 pairs of legs, compound eyes,
antennae, 2 body sections Head-thorax
and abdomen
2. Spiders, scorpions, ticks.
• 4 pairs of legs, simple eyes, 2 body
sections.
3. Centipedes
• 1 pair of legs per section, have poison
claws, eat insects.
4. Millipedes.
• 2 pairs of legs per segment, no claws,
eat plants.
5. Insects- are the only invertebrate that
can fly!!!
• 3 body parts, 2 compound eyes and 3
simple eyes, 1 pair antennae, 3 pairs of
legs, 2 pairs of wings.
Spiny-skin animals
• Are invertebrates with 5-part body design,
radial symmetry, and spines.
• Examples starfish, sand dollars, sea
urchin. Found only in Oceans.
• Tube feet- like suction cups that help
starfish move, eat, attach to rocks.
• Can regenerate parts.
Chapter 8.2 Notes
• Vertebrates are the most complex
organisms in the animal kingdom.
• Chordate is an animal at sometime in its
life, has a tough, flexible cord along its
back.
• Endoskeleton-skeleton inside the body.
7 Classes of Chordates
1. Jawless fish- Cold-blooded (exothermic)
Have gills, have no jaws, no scales,
skeleton made of cartilage. Example
Lamprey (Parasite)
2. Cartilage fish- skeleton made of
cartilage. Have jaws, tooth like scales,
paired fins. Examples sharks and rays.
3. Bony fish- skeleton made of bone. Gill
cover (Operculum), swim bladder,
scales, slime.
4. Amphibians- are animals that live part of
their life on land and the other part in the
water. Tadpoles (young). Can breathe
through gills (young), lungs, skin. Coldblooded. Examples frogs, toads,
salamanders.
• Hibernation being inactive during cold
weather.
• Estivation being inactive during warm
weather.
5. Reptiles- are animals that have dry scaly
skin, and can live on land. Cold-blooded, lay
leathery eggs. Examples are snakes,
lizards, turtles, crocodiles, and alligators.
6. Birds- are warm-blooded (endothermic).
Have wings, beaks, 2 legs, feathers, scales
on their legs, hollow bones.
7. Mammals-animals with hair that feeds milk
to its young. Warm-blooded, have mammary
glands, give live birth, care for young.
Pouched-kangaroos and opossums. Egglaying-duck billed platypus and spiny
anteater. Placental- humans, dogs,
cats...almost all other mammals.
• “Crayfish”. April 9, 2007.
http://www.biol.andrews.edu/everglades/or
ganisms/Invertebrates/Arthropoda/Pond%
20Crayfish/pond_crayfish-main.jpg
• “Insects”. April 9, 2007.
http://www.ecodev.gr/images/photos/Insect
s_and_rodents/insects.jpg