Topic 21: Clade Amniotes

Question 1

Amniotes

Answer 1

A group of tetrapods that include reptiles, birds, and mammals

Question 2

3 Shared Derived Traits of Amniotes

Answer 2

Amniotic Egg, Internal Fertilization via Intromittent Organs, Direct Developement

Question 3

Amniotic Egg Traits

Answer 3

Four embryonic layers: Amnion, Yolk Sac, Allantois, Chorion. Porous calcareous or leathery shell of embryo that’s layed on land.

Question 4

Amnion

Answer 4

Protects the embryo from mechanical shock

Question 5

Yolk-Sac

Answer 5

Contains yolk: a nutrient source

Question 6

Allantois

Answer 6

Water disposal sac, and gas-exchange organ.

Question 7

Chorion

Answer 7

O2/CO2 exchange from embryo to air across shell. Protects from desiccation.

Question 8

Albumen

Answer 8

Provides nutrient to embryo.

Question 9

Where do Amniotes lay their eggs?

Answer 9

On land.

Question 10

Intromittent Organs

Answer 10

AN external genitalic organ of males that is specialized to deliver sperm during copulation and is characteristic of internal fertilization.

Question 11

Adaptation for Terrestrial Life

Answer 11

Thick, impermeable skin = water retention. and Lungs powered by muscles.

Question 12

What is classification based on?

Answer 12

The number of major openings in the skull.

Question 13

Anapsids

Answer 13

Classified based on their lack of temporal fenestrae (Turtles)

Question 14

Clade Synapsids

Answer 14

Based on their one pair of temporal fenestra (Mammals)

Question 15

Clade Diapsids

Answer 15

Based on their two pairs of temporal fenestra behind their eye sockets (Reptiles)

Question 16

Fenestra

Answer 16

A natural opening or window in a bone.