Animal Notes Chapter 25 Notes

Animal notes outline I. Characteristics A. Multicellular eukaryotes B. Movement C. No cell walls D. Heterotroph E. Organ systems F. Sexual reproduction II. Invertebrates A. Definition, number B. Skeleton? C. Examples III. Vertebrates A. Definition, type of symmetry B. 5 classes 1. fish 2. amphibians 3. reptiles 4. birds (aves) 5. mammals

Characteristics of Animals Multicellular eukaryotes Multicellular eukaryotes Ability to move to reproduce, obtain food, protection Ability to move to reproduce, obtain food, protection Do NOT have cell walls Do NOT have cell walls Heterotrophs: consume other organisms for energy Heterotrophs: consume other organisms for energy

Characteristics of Animals Digestion of food and storage for energy later (ATP) Tissues, organs, organ systems (nerves and muscles unique to animals) Most reproduce sexually

Invertebrates: Animals that lack internal backbones Animals that lack internal backbones 95% of the animal kingdom 95% of the animal kingdom Exoskeletons are common, can have endoskeleton Exoskeletons are common, can have endoskeleton Examples: sponges, worms, mollusks, arthropods (insects, crabs), jellyfish Examples: sponges, worms, mollusks, arthropods (insects, crabs), jellyfish

Invertebrates Ex. Sponges: asymmetrical, filter feeders, sessile

Invertebrates Ex. Cnidarians: radial symmetry, nematocyst (barbed spine with toxin) Ex. Cnidarians: radial symmetry, nematocyst (barbed spine with toxin) jellyfish, corals, sea anemones jellyfish, corals, sea anemones

Invertebrates Ex. Worms: can be flat, round, or segmented, can be parasitic Ex. Worms: can be flat, round, or segmented, can be parasitic

Invertebrates Ex. Mollusks: bilateral symmetry, may have shells Ex. Mollusks: bilateral symmetry, may have shells snails, clams, octopus snails, clams, octopus

Invertebrates Ex. Arthropods: exoskeleton, jointed appendages Ex. Arthropods: exoskeleton, jointed appendages Insects, spiders, crabs Insects, spiders, crabs

Invertebrates Ex. Echinoderms: endoskeleton, tube feet Ex. Echinoderms: endoskeleton, tube feet Sea urchins, sea stars Sea urchins, sea stars

Vertebrates: Animals that have internal backbones Animals that have internal backbones All have bilateral symmetry (can be divided into two identical halves) All have bilateral symmetry (can be divided into two identical halves)

Examples of Vertebrates: Fish: Fish: Aquatic, have gills Aquatic, have gills 2-chambered heart 2-chambered heart Usually lay eggs Usually lay eggs

Class Chondrichthyes: Cartilaginous fish

Jawless Fish:

Examples of Vertebrates: Amphibians: Life in water and on land Moist skin Eggs lack shells so must be laid in moist areas Breathe with lungs or skin Ex: frogs, toads, salamanders Class Amphibia

Examples of Vertebrates: Reptiles: Reptiles: Scaly skin Scaly skin Amniotic egg Amniotic egg Ex: snakes, turtles, crocodiles Ex: snakes, turtles, crocodiles Class Reptilia

Examples of Vertebrates: Birds: Birds: Feathers Feathers Hollow bones Hollow bones Wings for flight Wings for flight Ex: flamingo, owl, eagle, robin Ex: flamingo, owl, eagle, robin Class Aves:

Examples of Vertebrates: Mammals: Hair or fur Milk Complex behavior (parental care) Bear live young instead of eggs (exception: marsupials & platypus) Placental mammals: baby develops in uterus Ex: humans, dog, horse, whale, elephant, bat