Lesson 24 Lecture notes

Question 1

All chordates have… (at least in development)

Answer 1

pharyngeal slits
Dorsal hollow nerve cord
Notochord
post anal tail

Question 2

Which germ layer turns into the Dorsal hollow nerve cord?

Answer 2

Ectoderm

Question 3

How many subphyla are there in Phylum Chordata?

Answer 3

three-
urochordata
cephalochordata
vertebrata

Question 4

All vertebrates have

Answer 4

a vertebral column
Gastrointestinal tract
Closed circulatory system
sexual reproduction
Complex nervous systems

Question 5

Cephalochordates have no

Answer 5

backbone or brain

Question 6

Cephalochordates live

Answer 6

primarily in tropical marine waters

Question 7

Cephalochordates

1. keep their nerve cord, tail, pharyngeal slits, and notochord
2. undergo metamorphosis and lose the above features

Answer 7

1. keep their nerve cord, tail, pharyngeal slits, and notochord

Question 8

Urochordates

1. keep their nerve cord, tail, pharyngeal slits, and notochord
2. undergo metamorphosis and lose the above features

Answer 8

2. undergo metamorphosis and lose the above features

Question 9

this fish

1. keeps its notochord into adulthood
2. has a skull
3. usually 1.5 ft long
4. slight tailfin
5. no jaw, no scales, no paired fins
6. slime glands

Answer 9

hagfish

Question 10

this fish

1. has a very developed vertebral column
2. andromous
3. usually inches to 3 feet
4. dorsal fin
5. no jaw, no scales, no paired fins

Answer 10

lampreys

Question 11

what is the difference between a skate and a ray?

Answer 11

skates lay eggs, rays give birth to live young, and are typically much larger

Question 12

What do sharks mainly use to locate their prey?

Answer 12

electroreception

Question 13

Bony fish all (or almost all)

Answer 13

live in water and have bony, calcified vertebral columns and skulls

Question 14

Gills are the primary structure for

Answer 14

respiration