Bio 108 - Lecture 24 Flashcards Preview

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Flashcards in Bio 108 - Lecture 24 Deck (20):
1

Amniotes

- Include mammals and reptiles

2

Amnyotic Egg

4 Extraembryonic Membranes surround the embyro
Egg shell impervious to water loss

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4 Extraembryonic membranes of the Amnyotic egg and their functions

1) Amnion - protects embryo
2) Yolk Salk - contains food
3) Allantois - waste disposal
4) Chorion - in contact with liquid surrounding the embryo

4

Characteristics Allowing terrestrial life

Copulation and Internal fertilization
Waterproof skin
Muscles and rib cage

5

Hylonomus

Earliest amnyote

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Two Major Clades of Amynotes

Reptilia, including birds
Snyapsida

7

Skull Holes

- Major classification of amnyotes
- diapsid skul has two holes per side
- synapsid has one
- anapsid has zero

8

Anapsid skull taxa

turtles

9

Characteristic of Non-Avian Reptilia

Keratinous scales
Leathery eggshell
Ectotherms
Need very few calories

10

Cloacas

Single opening for waste, eggs, and sperm

11

Testudines

- Dorsal and ventral sheilds
- test = shell
- turtles
- Anapsids
- Intromittent organ

12

Lepsodia: Tuataras
Lepido =
Saur =

Tuataras
- Teeth fused to jaw bones
- Lack intomittant organ
= scale
= lizard

13

Lepsodia: Squamata
squam= scaly

Snakes and Lizards
- Loosely joined jaw and skull
- Paried hemipenes in male
External ear openings in lizards
No external limbs

14

Crocodilia

Cannot chew, swallow prey or rip it into chucks
Maternal care

15

Archosauria

Extinct group
includes pterosaurs, and non-avian dinosaurs

16

Dinosours

dino = terror
some were endothermic

17

Class Aves

- Birds
- Feathers are a synapomorphy
- beaks and no teeth
- no claws

18

Origin of Birds

Evolved from velociraptor
Came from dinosaurs with feathers
Archaeopteryx - most famous extinct bird

19

Characteristics of Modern Birds

Grind food in gizzard
Adaptions for flight
Warm blooded (endothermic)
Cloaca
Do not intromit

20

Bird feathers

Care for feathers by preening
Move oil all over feathers and keeps them stable
Removes parasites