Topic 29: Clade Tetrapods

Question 1

Clade Tetrapods

Answer 1

Surviving Lineage of Lobe-fins, w/ two pairs of skeleton-supporting limbs w/ feet and digits.

Question 2

Tetrapod Limbs

Answer 2

Upper single bine hinged to a pair of parallel long bone w/ a terminal hand/foot with jointed digits.

Question 3

Challenges to Terrestrial Life

Answer 3

Gravity, Water conservation, reproduction, gas exchange, locomotion, sensory perception, temperature regulation.

Question 4

Tiktaalik

Answer 4

Transitional Fossil that had both fish and tetrapod traits.
Separated shoulder from skull, 1/2 fish 1/2 tetrapod limbs, wide range pelvic movement.

Question 5

Acanthostega

Answer 5

Transitional Fossil

Question 6

Tetrapod adaptation for terrestrial life

Answer 6

Four limbs with feet and digits, distinct neck, fusion of pelvis and vertebral column, absence of gills, ears for airborne sound

Question 7

Extant Groups

Answer 7

Amphibia and Amniota