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Flashcards in Prototheria Deck (27)
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1

How may orders are found within the Protheria ?

Only one- The Monotremes

2

Give the development to Monotremes ?

Synapsids
Pelycosaurs
Therapsids
Cycodonts
Australosphenidians
Monotremes

3

They are the most primitive mammals alive today
True or False

True

4

Which super continent where the early ancestors of Monotremes restricted to ?

Southern supercontinent Gondwana

5

Why are they called Monotremes ?

'One holed species'
Single hole for faeces, urine, gametes

6

What is the name of the single hole in monotremes ?

Cloaca

7

What reptilian features remain in the monotremes ?

They lay hard-shelled eggs and brood them.

8

How do Monotreme infants suck milk ?

Lap tufts hair covering mammary glands
No Mammilae

9

What is a Mammilae ?

A teat, Nipple. Enables milk delivery.

10

Monotremes have teeth
Monotremes are venomous
True or false ?

False
True

11

How many living species are there ?

5
Echindna (4)
Duck billed platypus

12

How many families of Monotreme are there ?

2

13

What are echidna spines made from ?

They are modified hairs, fur is beneath spines.

14

What is the diet of echidna ?

Invertebrates, ants, termites
Spines on roof of mouth and tongue enable digestion

15

Describe the life cycle of echidna offspring

Short gestation
Eggs hatch after 10 days
young move to a pouch where they feed off milk for 6 months

16

Give the 4 species of Ecidna

1 Short beaked- Australia
3 Long beaked- New guinea

17

Give the name of critically endangered echidna

Zaglossus Attenboroughi
V localised habitat

18

Give the adaption of platypus that enable them to hunt

Electrolocation,
Enables them to find benthic invertebrates as shut eyes when they dive.

19

What is the role of the hind feet

They are partially webbed
Act as rudders

20

What is the role of the front feet ?

They are fully webbed
Enable powerful swimming.

21

What is the role of the tail ?

Fat storage

22

Give the life cycle of the duck billed platypus's offspring.

Usually have 2 eggs, placed in a burrow
Incubated for 10 days
No pouch
3-4 month lactation

23

Give the key adaption of male platypus,

Spurs on the rear ankles
Connected to venom glands in the high.
Increase in size at mating time

24

How many genes does the platypus have ?

18,500
Same number as humans

25

What genes are found in the bill of the platypus ?

Olfactory receptor genes
(smell)

26

Platypus's contain genes from birds, what are these for ?

Egg laying

27

Describe the genes for the males venom glands.

Evolved from duplications in a group of genes, from ancestral reptiles.

Duplication in the same genes has given the same venom glands in modern reptiles.