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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 8SQ
Textbook Problem
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The closest living relatives of hagfishes are ___ .

  1. a. snakes
  2. b. sharks
  3. c. lampreys
  4. d. placoderms

Summary Introduction

Concept introduction: Lampreys and hagfishes are chordates. That is they have a notochord, a dorsal nerve cord, and gill slits. The lampreys and hagfishes are classified under the Class: Pisces. They are jawless fishes that are also known as ostracoderms.

Explanation of Solution

Reason for the correct answer:

The lampreys and hagfishes are modern ostracoderms that belong to the Clade: Cyclostomata and under Class: Pisces that are characterized by “shelled skin and round-mouthed”. Their head and at times their body are covered by external bony plates. The lampreys are parasitic and hagfishes are bottom-feeders. The lampreys and hagfishes are close relatives than they are with the sharks and placoderms, because they are classified under the same clade and share several similar characteristics. Molecular studies have revealed that they have evolved from an old ancestral ostracoderm, which is making them cousin to genera. They are not related to snakes, because snakes belong to Class: Reptilia.

Option c. is given as “lampreys” and since hagfishes and lampreys are closely related genera, the correct answer is option c.

Reasons for the incorrect answers:

Option a...

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