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The diversity or modem vertebrates was shaped in part by mass extinctions. The most severe extinction event we know of occured at the border between the Permian and Triassic periods about 250 million years ago. An estimated 96 percent of the marine species and 70 percent or land species disappeared in what is sometimes called "The Great Dying." The cause of this mass extinction remains under investigation. Suggested causes include an asteroid impact, extreme volcanic activity, or a sudden release of carbon dioxide from deposits on the sea floor. Which groups of vertebrates were present when this mass extinction event occurred? Which evolved afterward?

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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 25, Problem 4CT
Textbook Problem
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The diversity or modem vertebrates was shaped in part by mass extinctions. The most severe extinction event we know of occured at the border between the Permian and Triassic periods about 250 million years ago. An estimated 96 percent of the marine species and 70 percent or land species disappeared in what is sometimes called "The Great Dying." The cause of this mass extinction remains under investigation. Suggested causes include an asteroid impact, extreme volcanic activity, or a sudden release of carbon dioxide from deposits on the sea floor. Which groups of vertebrates were present when this mass extinction event occurred? Which evolved afterward?

Summary Introduction

To explain: The groups of vertebrates that were present during mass extinction event and those vertebrates that evolved afterward.

Concept introduction: The extinction is the phenomenon where the entire species dies with no surviving progeny. “The Great Dying” is the period where mass extinction of species occurred at the border between Paleozoic and Mesozoic eras. Several factors are said to have contributed to it namely severe volcanic activity, asteroid hitting the earth, and spontaneous release of carbon dioxide from sea floor deposits. After this severe extinction, a major natural selection occurred and a large set of species evolved to adapt to the new conditions.

Explanation of Solution

The mass extinction is said to have occurred between the Permian period of the Paleozoic era and the Triassic period of the Mesozoic era around 250 million years ago. During this period, the invertebrate chordates evolved from the invertebrates. The fishes including jawless and jawed fishes like placoderms dominated the aquatic habitat. The amphibians evolved after that from the lobe-finned fishes that also dominated during that time. The primitive amniotes had just branched from the ancestral amphibian. Reptile-like animals, the therapsids, evolved from the amphibians of that time...

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