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Chapter 29: Q. 25 (page 827)

What can be inferred about the evolution of the cranium and vertebral column from examining hagfishes and lampreys?

Short Answer

Expert verified

By examining hagfishes and lampreys, we can infer that cranium evolved earlier than vertebral column.

Step by step solution

01

Introduction

Hagfishes and lampreys are jawless fishes that have distinct cranium and complex sense organs including eyes that distinguishes them from the invertebrate chordates.

02

Explanation

Comparison of hagfishes with lampreys shows that the cranium evolved first in early vertebrates, as it is seen in hagfishes, which evolved earlier than lampreys. This was followed by evolution of the vertebral column, a primitive form of which is seen in lampreys and not in hagfishes.

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Most popular questions from this chapter

Describe the functions of the three extra-embryonic membranes present in amniotic eggs.

Explain why frogs are restricted to a moist environment.

Why did gnathostomes replace most agnathans?

5. Which group of invertebrates is most closely related to vertebrates?

a. cephalochordates

b. echinoderms

c. arthropods

d. urochordates

A marine biologist catches a species of fish she has never seen before. Upon examination, she determines that the species has a predominantly cartilaginous skeleton and a swim bladder. If its pectoral fins are not fused with its head, to which category of fish does the specimen belong?

a. Rays

b. Osteichthyes

c. Sharks

d. Hagfish
See all solutions

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