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Biol 1620 > Vertabrates > Flashcards

Vertabrates Flashcards

1
Q

Four defining characteristics of Chordates

A

Notochord
Hollow dorsal nerve cord
Pharyngeal slits
Muscular post anal tail

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2
Q

Define: Notochord

A

Flexible rod between digestive tube and nerve cord

Becomes back bone

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3
Q

Nerve cord

A

Central nervous system

lies behind the notochord

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4
Q

Define: Pharyngeal slits

A

Grooves in pharynx that open to the outside

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5
Q

Function of Pharyngeal slits

A

Suspension feeding
Gas exchange (not tetrapods)
Parts of ear head and neck (tetrapods)

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6
Q

Lancelets

A

Simplest chordate.

has all 4 classification, are suspension feeders

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7
Q

Tunicates

A

Chordate that looses its notocord in adulthood

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8
Q

Hagfish

A

Cartilage back bone
Cartilage skull
No jaws

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9
Q

Characteristics of vertebrates

A

Spinal cord enclosed in vertebrae
An elaborate skull
Fin rays (aquatic)

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10
Q

Lampereys

A

Oldest vertebrate
No jaw
Lots of teeth

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11
Q

Define gnathostomes

A

Vertebrates with jaw

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12
Q

Origin of teeth

A

Bone support for pharyngeal slits

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13
Q

Characteristics of gnathostomes

A

Duplication of hox genes
Enlarged forebrain (smell and vision)
Lateral line sensitive to vibrations (aquatic)

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14
Q

Chondrichthyans

A

Sharks, Rays etc

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15
Q

Characteristics of Chondrichhtyans

A

Cartilage skeleton evolved secondary to mineralized skeleton

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16
Q

Who are in clade osteichtyes

A

Boney fish and Tetrapods

Boney skeleton

17
Q

Tetrapods

A

Four limbs
Feet with digits
Ears for airborn sound

18
Q

Canada fossils

A

Tetrapods living in pangea move to canada with continental drift

19
Q

Amphibians

A

“land and water”

Fertilization is external

20
Q

Amniotes

A

Tetrapods
reptiles
birds
Egg contains a membrane

21
Q

Theropods

A

Dinosaurs with 2 feet (Bipedal)

22
Q

Birds

A

Reptiles with flight adaptations

23
Q

Achaeopteryx

A

Feathered flying dinosaur

Biol 1620 (12 decks)

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