Chapter 34: Vertebrates Flashcards

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1
Q

Chordates

A
  • composed of invertebrates, vertebrate group
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2
Q

Derived Characters

A
    1. Notochord
    1. Dorsal, hollow nerve chord
    1. Pharyngeal slits
    1. Post anal tail
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3
Q

Chordate Characteristics

A
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4
Q

Lancelets

A
  • Belong to Subphylum Cephalochordata
  • Basal chordates
  • Lance shaped body
  • Suspension feeders
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5
Q

Tunicates

A
  • Belong to Subphylum Urochordata
  • Also called “sea squirts”
  • Suspension feeders
  • Lose many chordate characters as adults
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6
Q

​Vertebrates

A
  • are chordates with a backbone
  • All members also known as craniates
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7
Q

Cyclostomes

A
  • are a clade of living, jawless vertebrates
  • Called the “round mouths”
  • Include
      1. Hagfish
      1. Lampreys
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8
Q

Hagfish

A
  • Bottom dwelling, scavengers
  • Can produce slime, used for defense
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9
Q

Lampreys

A
  • are filter feeders as larva
  • Become parasites as adults
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10
Q

Gnathostomes

A
  • are a clade of jawed vertebrates
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11
Q

Chondricthyes

A
  • a clade of cartilaginous fish
  • Have an endoskeleton made of cartilage
  • Include
      1. Sharks
      1. Rays
      1. Ratfishes
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12
Q

Osteichthyes

A
  • a clade of “bony fish”… misleading
  • Have an ossified endoskeleton
  • Include
      1. Ray finned fish
      1. Lobe fins
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13
Q

Ray Finned Fish

A
  • Show the greatest vertebrate diversity
  • Have fins made of bony rays
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14
Q

Lobe-Fins

A
  • Fins made of rod shaped bones
  • Bones surrounded by thick muscles
  • Three lineages
      1. Coelacanths
      1. Lungfishes
      1. Tetrapods
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15
Q

Tetrapods

A
  • are gnathastomes that have limbs with digits
  • Include groups
      1. Amphibians
      1. Amniotes
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16
Q

Tiktaalik fossil

A
17
Q

Amphibians

A
  • “both ways of life”
  • Poorly developed lungs, cutaneous respiration
  • Three major groups
      1. Salamanders - tails
      1. Frogs - lack tails
      1. Caecilians - legless
18
Q

Amniotes

A
  • have a terrestrially adapted egg
  • Living members
      1. Reptiles
      1. Mammals
19
Q

Derived traits of Amniotes

A
  • Major character is the amniotic egg
  • Others include
      1. Egg shell
      1. 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
      1. insulation
      1. camouflage
      1. courtship
  • Archaeopteryx
    • ​​considered an early bird
22
Q

Mammals

A
  • are amniotes that produce milk; have hair
  • Three groups
      1. Monotremes
      1. Marsupials
      1. Eutherians (Placental)
23
Q

Monotremes

A
  • are egg laying mammals
  • Lack nipples
  • Include:
      1. Platypus
      1. 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