Chapter 27, Problem 15STP

Summary Introduction

To write: The reason trilobites would fit into the phylogenic tree that is shown in the question.

Introduction: Trilobites from class Trilobita from diverse environments also had unique features that were naturally suited to their climate. Trilobites are extinct marine arthropods. But one of the oldest recognized arthropod groups is Trilobites.

Explanation of Solution

Trilobites are the oldest group of arthropods. They are not available now as they have been extinct. But as they had a large variety, they have a record which proofs that they belonged to the group of arthropods. As they had exoskeleton, jointed legs which are the features of arthropods, therefore they fit into the phylogenic tree of arthropods. Trilobites were mainly marine animals having diverse varieties that are proofed from the remaining fossil records of it.

Conclusion

Thus, trilobites would fit into the phylogenic tree that is shown in the question.