Phylums of Animalia

Question 1

Annelida

Answer 1

Segmented Worms
- appear to have “ringed” segments
- found in various habitats
-parasitic and free-living

Question 2

Nematoda

Answer 2

roundworms
- bodies resemble a “thread”
- live in nearly every environment
- free-living or parasitic
-mostly microscopic

Question 3

Platyhelminthes

Answer 3

flatworms
- parasitic or free-living

3 major classes:
- flukes (parasitic)
- tapeworms (parasitic)
- planarians (free-living)

Question 4

Mollusca

Answer 4

clams, snails, squids
- mostly marine, some freshwater
- bilateral sym.
- soft bodies
- muscular foot (moving and anchoring)
- visceral mass (contains vital organs)
- mantle (skin-like organ covering visc. mass)

Question 5

Cnidaria

Answer 5

jellyfish, hydra, sea anemones
- soft bodies
- radial sym.
- two germ layers: epithelium and mesoglea

Question 6

Porifera

Answer 6

sea sponges “pore bearers”
- covered in pores
- invertebrates
- ectothermic
- heterotrophic
- adults are sessile; young larvae are motile
- asymmetrical

Structure:
- epidermis: outer layer of cells
- mesenchyme: jelly-like substance in between
- spongin: web of protein

Question 7

Arthropoda

Answer 7

insects, lobsters, spiders
- bilat. sym.
- jointed appendages
- exoskeleton
- segmented bodies
- open circulatory system
- ventral nervous system: ganglion, nerve cord, sensory organs

Question 8

Echinodermata

Answer 8

sea stars, sea urchins, sea cucumbers, sand dollars
- “spiny skinned” animals
- marine
- unique water vascular system: tubes filled with water branching thru entire body; for feeding, respiration, movement, and sensing

Question 9

Chordata

Answer 9

jawless fish, cartilaginous fish, bony fish, amphibians, reptiles, birds, mammals
- pharyngeal slits
- dorsal hollow nerve cord
- notochord
- post-anal tail