Lesson 16 - Trilobites

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Department
Earth and Ocean Sciences
Course
EOSC 326
Professor
Louise Longridge
Semester
Winter

Description
Lesson 16 Learning Objectives 1 Describe the basic biology of trilobites2 Describe the trilobite exoskeleton and how growth was achieved3 Compare and contrast the different trilobite eye systems4 Discuss some of the unusual eye adaptations found in the trilobites5 Compare and contrast the two major trilobite groupsTrilobitesPeriod Entirely marine creatures that evolved in the Early Cambrian and became extinct at the end of the PermianHabitat Most trilobites were vagrant benthic organisms that lived in shallow marine settings few trilobites lived in deep waterClass Trilobites are arthropods and over 15000 species are recognizedMorphology o Adults ranged in size from 1mm to over 75cm trilobites are bisymmetrical o Dorsal side of their exoskeleton is hard it offered protection and support for the animal It is composed of calcium carbonate and is divided into three parts cephalon thorax and pygidiumCephalon This is the animals head it contained a sensory system the eye
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