Lecture 33 - Vertebrates I Flashcards Preview

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Flashcards in Lecture 33 - Vertebrates I Deck (17):
1

what are amniotes?

group of tetrapods whose living members are the reptiles (including birds + mammals)

2

what are 3 terrestrial adaptations?

1. Relatively impermeable skin
2. Rib cage allows for ventilation
-Point of attachment to expand and collapse lungs
3. Amniotic egg

3

3 key characteristics of the amniotic egg

1. Evolved shelled egg that retains water, laid in dry place
2. Bird eggs calcareous shells (inflexible)
3. Reptile eggs leathery eggs (flexible)

4

What is a key feature of the amniotic egg?

Extraembryonic membranes

5

What are 3 functions of extraembryonic membranes?

1. gas exchange
2. waste storage
3. transfer of stored nutrients to embryo

6

Reptilia (body 2)

1. Rib cage ventilation,
2. waterproof keratin scales

7

Reptilia (heat source)

-ectothermic (all reptiles aside from birds)
-endothermic (birds)

8

Reptilia

tuataras, lizards, snakes, turtles, crocodilians

9

2 sublcasses of Reptilia?

1. parareptiles
2. diapsids

10

2 characteristics of parareptiles

1. EXTINCT; first major group to emerge
2. Serve as start of reptilian class
3. Large, stocky, quadrupedal herbivores

11

what are the 2 major lineages of diaspids?

1. lepidosaur
2. archosaur

12

lepidosaur (EX)

tuataras, lizards, snakes

13

3 characteristics of lepidosuars

1. loose jaw
2. venom
3. chemical + heat sensors

14

archosaurs (EX)

turtles, crocodilians, pterosaurs, dinosaurscretaceous mass extinction, birds

15

9 characteristics of bird/archosaurs

1. wings
2. one ovary
3. loss of teeth gizzard
4. endothermic
5. large brain
6. lack of urinary bladder
7. small gonads
8. hollow bonds
9. 4 chambered heart

16

______ are most numerous/diverse reptiles apart form birds

squamates

17

Class Mammalia evolution

evolved from synapsid ancestors