6: Terapods Flashcards
(42 cards)
tetrapod that typically have aquatic young and semi aquatic or terrestrial adults
amphibians
amphibian skin: smooth/moist modified for _____ _____
cutaneous respiration
amphibians breathe w their ______ and _____
lungs and skin
amphibians are ______ or cold-blooded
ectothermic
many amphibians undergo ____; some species of salamander (axolotl) does not; some have no aquatic larval stage
metamorphosis
3 modern amphibian orders
apoda
urodela
anura
Modern amphibian order:
- caecilians
- limbless
- resemble earthworm w/ jawed mouth
- eyes slightly reduced/absent
apoda
Modern amphibian order:
- newts/salamanders
- tailed amphibians
urodela
terrestrial salamanders undergo ____ _____; some retain larval features into adulthood
direct development
Modern amphibian order:
- frogs/toads
- no tail, gills in adulthood
- head+trunk fused
- rely more on lungs
anura
tetrapod adapted for terrestrial environments
amniotes
the _____ ____ protects the embryo from drying out and maintains a fluid filled enviro in amniotes
amniotic egg
2 amniote lineages
sauropsids
synapsids
sauropsid characterized by scaly skin
- most ectothermic
- most 3-chambered hearts
reptiles
reptile skin have scales made of _____ and _____ _____ to prevent water loss; regularly shed to accomodate growth
keratin and waxy lipids
this reptile has a 4-chambered heart
crocodilians
3 extant reptile taxa
testudines
lepidosauria
archosauria
reptilia class:
- turtles/ tortoises
- no teeth
testudines
testudines use ____ ____ instead of teeth
keratinized plates
2 part shell in testudines (dorsal; ventral)
carapace
plastron
reptilia class:
- lizards/snakes
- some viviparous
- make up 95% of all extant species
squamata
most squamata have a ____ ______: skull that has multiple movable joints
kinetic skull
lizards are ______; snakes are ______
paraphyletic; monophyletic
squamata:
- 4 limbs, short bodies, external ear opening
- movable eyelids
- vision keen for daylight
lizards