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BIOL 202 > V1 Introduction to Vertebrates > Flashcards

V1 Introduction to Vertebrates Flashcards

0
Q

Why do we study them?

A

To understand ourselves better and they dominate ecosystems.

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1
Q

How many species of vertebrates exist?

A

50 000 species (only 1% of all organisms on earth)

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2
Q

Myxini

A

Hagfishes

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3
Q

Petromyzontida

A

Lamprey

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4
Q

Chondrichthyes

A

Sharks/ skates/ rays

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5
Q

Actinopterygii

A

Ray-finned fishes

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6
Q

Sarcopterygii

A

Lobe-finned fishes

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7
Q

Amphibia

A

Frogs/ salamanders/ caecilians

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8
Q

Reptilia

A

Crocodilians/ lizards/ snakes/ turtles/ tartua

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9
Q

Aves

A

Birds

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10
Q

Mammalia

A

Endothermic amniotic

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11
Q

Craniata

A 
All vertebrates:
Myxini
Petromyzontida
Chondrichthyes
Acteropterygii
Sarcopterygii
Amphibia
Reptilia
Aves
Mammalia
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12
Q

Vertebrata

A 
Petromyzontida
Chrodrichthyes
Actinopterygii
Sarcopterygii
Amphibia
Reptilia
Aves
Mammalia
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13
Q

Gnathostomata

A

Jaw mouthed

Chondrichthyes
Actinopterygii
Sarcopterygii
Amphibia
Reptilia 
Aves 
Mammalia
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14
Q

Agnatha

A

No jaw mouth

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15
Q

Tetrapoda

A 
4 legged
Amphibia 
Reptilia
Aves
Mammalia
16
Q

Amniota

A

Reptilia
Aves
Mammalia

17
Q

Pikaia gracilens

A

The first fossil evidence of Chordates 550 mya
Burgess Shale
Survival of the luckiest

18
Q

Vertebrate origins involve HOX genes

A

A duplication of HOX genes (12 instead of 6) May have originated during paedomorphosis - sexual maturation of a larval form of a urochordate-like ancestor. HOX genes regulate development and so an increased number may give rise to a more complex organism.

BIOL 202 (10 decks)

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