Bio 108 - Lecture 21

Question 1

Deuterstomia

Answer 1

• Radial, indeterminate cleavage
• Enterocoelous
• Blastopore does not become mouth

Question 2

Phylum Echinodermata Characteristics
Echi=
Derm=

Answer 2

• Sea creatures
• Calcareous endoskeleton
• Pentaradial symmetry
• Larvae are bilaterally symmetrical
• Thin epidermis covers endoskeleton, made up of thousands of calcareous plates called ossicles
• Water vascular system
• Broadcast spawning
  =Spines
  =Bone

Question 3

Echinodermata Water Vascular System

Answer 3

Tube feet - network of canals branching into extensions

Connects to sea water via special porous ossicle called madreporite

Question 4

Echinodermata Classes

Answer 4

1) Asteroidea
2) Crinoidea
- Oral side up
- Stalked and sessile
3) Holothuroidea
- Secondary bilaterally symmetrical
- Feeding tentacles
- Scattered ossicles

Question 5

Phlyum Chordata 4 Synapomorphies

Answer 5

1) Notochord - supports body
2) Dorsal, hollow neve cord
- most animals have solid, ventral ones
- Anterier portion develops into brain
3) Pharyngeal Slits/Clefts
- Used for suspension feeding, gas exchange, hearing
4) Post anal tail
- Posterior to anus
- Propulsve force to swimmers

Question 6

Character States of Chordates

Answer 6

• Segmentally arranged muscle blocks

- Segmented phylum

Question 7

Urochordata

Uro=

Answer 7

• Tunicates
• Tadpole larvae
• Pharngeal basket with many gill slits
• Planktonic
• Some remain permanently in form of larvae (paedogenesis)
  = tail

Question 8

Cephalochordata

cephalo =

Answer 8

• Muscleblocks
• water sent out of body through atripore
  = head