Animal Phyla Notes
Part 2
6) Mollusca
Are the second largest phylum of animal. Mollusks are broken
down into 3 classes: gastropods, bivalves, and cephalopods
Characteristics:
-Bilateral symmetry
-Live in water or on land
-Have soft bodies
Examples of Mollusks
-Most have hard shells or
- Slugs
shell like coverings
- Clams
7) Arthropods- means "jointed foot"
- Octopus
Arthropods are the largest group of animals on Earth. 75% of
all animal species on earth are Arthropods.
Characteristics:
-Bilateral symmetry
-Live on land or water
-Bodies with 3 segments
(head, thorax, abdomen)
-Have exoskeletons (skeletons on the outside)
Examples of Arthropods
- Spiders
- Crickets
- Lobsters
8) Echinodermata- means "spiny skinned"
Echinoderms live on the sea floor in all parts of the world’s
oceans. Sea stars prey on oysters, and other shell fish,
some are scavengers, and others scrape algae off rocky
surfaces.
Characteristics:
- Radial symmetry
Examples of Echinoderms
- Only live in salt water
- Have spiny or leathery skin
- Sea Star
- Have water vascular system
- Sea Cucumber
- Sea Urchin
- Sand Dollar
9) Chordata
Most chordates are vertebrates- organisms that have a backbone
Characteristics:
- Bilateral Symmetry
- Live in land and water
- Have endoskeletons - skeletons on inside (backbones)
- Paired appendages (legs, arms)
Examples of Chordata
- Human
- Fish
- Bird