Flashcards in Mammals Part I Deck (45)
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1
How many species of mammals are there?
5000 species
2
what the 3 unique features of mammals?
1. hair: insulation, camouflage, sensory and defence
3
what the 3 unique features of mammals?
2. sweat glands
4
what the 3 unique features of mammals?
3. mammary glands
5
skull types of amniotes: anapsids
turtles
6
skull types of amniotes: synapsids
terapsids and mammals
7
skull types of amniotes: euryapsids
extinct marine reptiles
8
skull types of amniotes: diapsids
dinosaurs and birds
9
what is the key difference between skull size presence, size and number of temporal fenestrae:
holes that provide more surface area for muscle attachment
10
when did true mammals evolve?
around 225 mya - Triassic
11
Different morphological states of middle ear of mammals: MME
mandibular middle ear
12
Different morphological states of middle ear of mammals: TMME
transitional mandibular middle ear
13
Different morphological states of middle ear of mammals: DMME
definite mammalian middle ear
14
what did the development of the middle ear allow?
mammals to hear at higher frequencies than reptiles
15
mammals did not radiate until the extinction of??
dinosaurs
16
the ambulocetus is the ancestor to
whales
17
megatherium were
herbivourous and elephant sized
- giant ground sloth
18
how did smilodons go extinct?
hunting of humans
19
features of mammalia
endothermic
20
features of mammalia
advanced nervous system
21
features of mammalia
internal fertilization
22
features of mammalia
unlike reptiles and fish, mammals also show heterodonty
23
heterodonty
different teeth specilized for tasks
24
features of mammalia
specilization in teeth among species = varied diets
25
features of mammalia
4 chambered heart
26
Prototherians
- monotremes
- egg laying
- egg incubation until hatching
- have mammary glands
- playtpus, echidna
27
marsupials
-pouched
-early birth, fetus completes development in pouch
28
Eutherians
-placental
-embryo retained in female reproductive tract
29
where did platypus (PERRY THE PLATYPUS) originate from?
eastern australia
30
