Kingdom Animalia

All members of Kingdom Animalia share several common characteristics Multicellular eukaryotes Heterotrophic (must eat) Produce sex cells (sperm and egg) Move

Animal Phyla 34 total phyla in kingdom Animals are classified into phyla based on several different criteria including: –Body symmetry –Level of organization

Types of symmetry Asymmetry- (no symmetry) Radial symmetry- Circular shape- two identical halves result no matter how the animal is cut Bilateral symmetry-Identical right & left halves

Asymmetry

Radial Symmetry

Bilateral Symmetry

Levels of Organization Cellular- animal is made of many cells, none of which work together Ex. Sponge

Levels of Organization Tissue- Cells work together to form specialzed tissues like muscle tissue Ex. Jellyfish (Cniderians)

Levels of Organization Organs- Cells form tissues that work together to form organs that do a specific job (like a heart, or lung)

Phylum Porifera (sponges)

Aquatic, marine animals Sessile (doesn’t move) filter feeder Saclike bodies with many pores Asymmetrical

Phylum Porifera (sponges) Cellular level of organization Reproduce asexually by budding –If a piece breaks off, then both will continue to live and grow

Phylum Cnideria (jellyfish)

Tubular, or bell shaped animals that live in shallow coastal marine waters Have specialized stinging cells called cnidocytes Organized into tissues Radially symmetrical

Phylum Nemertea (Ribbon worms)

Bilaterally symmetrical Usually marine worms Have a distinct proboscis to capture prey, for defense, locomotion and for burrowing Organ level of organization

Phylum Platyhelminthes (Flatworms)

Are often parasites Include tapeworms & flukes Bilaterally symmetrical Free living flatworms are even more complex, having a head, and well developed nerves and brain

Phylum Nematoda (Roundworms)

Found in marine, freshwater and terrestrial environments Some are predators with teeth and mouth parts, while others are parasites.

Phylum Nematoda (Roundworms) More complex than flatworms & ribbon worms, they have a complete digestive tract, with a mouth and anus Ex. Hookworms, Trichinella, & pinworms

Phylum Mollusca

Have a three part body plan- visceral mass, mantle and foot Include clams, oysters (bivalves), squid(cephalopods), snails (gastropods) & octopi

Phylum Mollusca Mostly marine- also freshwater and some terrestrial (land) Organized on the organ level

Phylum Annelida

Segmented worms (like earthworms and leeches) Specialized digestive tract Well developed heart, with a closed circulatory system (have blood vessels) Marine, freshwater and terrestrial

Phylum Arthropoda

Over one million species Have jointed appendages- head, thorax, & abdomen Have an exoskeleton that they periodically molt Ex. Spiders, crayfish, insects

Phylum Echinodermata

Have an internal skeleton Radially symmetrical Include sea stars and sea lillies Well developed organs and systems (nervous, circulatory, respiratory, etc)

Phylum Chordata

Most advanced animals Well developed brain and central nervous system Bilaterally symmetrical Include birds, fish (bony and cartilage), amphibians, reptiles, & mammals. All reproduce sexually