Chapter 34: Vertebrates Flashcards
1
Q
Chordates

A
- composed of invertebrates, vertebrate group

2
Q
Derived Characters
A
- Notochord
- Dorsal, hollow nerve chord
- Pharyngeal slits
- Post anal tail
3
Q
Chordate Characteristics
A

4
Q
Lancelets
A
- Belong to Subphylum Cephalochordata
- Basal chordates
- Lance shaped body
- Suspension feeders

5
Q
Tunicates
A
- Belong to Subphylum Urochordata
- Also called “sea squirts”
- Suspension feeders
- Lose many chordate characters as adults

6
Q
Vertebrates
A
- are chordates with a backbone
- All members also known as craniates
7
Q
Cyclostomes
A
- are a clade of living, jawless vertebrates
- Called the “round mouths”
- Include
- Hagfish
- Lampreys
8
Q
Hagfish
A
- Bottom dwelling, scavengers
- Can produce slime, used for defense

9
Q
Lampreys
A
- are filter feeders as larva
- Become parasites as adults

10
Q
Gnathostomes
A
- are a clade of jawed vertebrates

11
Q
Chondricthyes
A
- a clade of cartilaginous fish
- Have an endoskeleton made of cartilage
- Include
- Sharks
- Rays
- Ratfishes

12
Q
Osteichthyes
A
- a clade of “bony fish”… misleading
- Have an ossified endoskeleton
- Include
- Ray finned fish
- Lobe fins
13
Q
Ray Finned Fish
A
- Show the greatest vertebrate diversity
- Have fins made of bony rays

14
Q
Lobe-Fins
A
- Fins made of rod shaped bones
- Bones surrounded by thick muscles
- Three lineages
- Coelacanths
- Lungfishes
- Tetrapods

15
Q
Tetrapods
A
- are gnathastomes that have limbs with digits
- Include groups
- Amphibians
- Amniotes

16
Q
Tiktaalik fossil
A

17
Q
Amphibians
A
- “both ways of life”
- Poorly developed lungs, cutaneous respiration
- Three major groups
- Salamanders - tails
- Frogs - lack tails
- Caecilians - legless

18
Q
Amniotes
A
- have a terrestrially adapted egg
- Living members
- Reptiles
- Mammals

19
Q
Derived traits of Amniotes
A
- Major character is the amniotic egg
- Others include
- Egg shell
- Rib cage - increases lung ventilation

20
Q
Reptiles
A
- a clade that includes the tuataras, lizards, snakes, turtles, crocodilians, birds and dinosaurs
- Have scales, create waterproof barrier
- Shelled eggs, laid on land
- Mostly ectothermic, absorbing external heat

21
Q
Origins of Bird
A
- Descended from bipedal, theropod dinosaurs
- Feathers evolved long before flight
- Early functions
- insulation
- camouflage
- courtship
-
Archaeopteryx
- considered an early bird
22
Q
Mammals
A
- are amniotes that produce milk; have hair
- Three groups
- Monotremes
- Marsupials
- Eutherians (Placental)
23
Q
Monotremes
A
- are egg laying mammals
- Lack nipples
- Include:
- Platypus
- Echidna

24
Q
Marsupials
A
- have live births; nipples
- Embryo connected to mother by placenta
- Born early, complete development while nursing in pouch called marsupium
- Members include opossum, kangaroo, koala

25
Q
Eutherians

A
- Commonly called placental mammals
- Live birth, nipples
- Have complex placenta
- Young complete development in uterus
