04_Feb25_slides - LearningObjectives Identify diagnostic...

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3/14/2011 1 Learning Objectives Identify diagnostic characteristics of Ecdysozoa and Echinodermata and explain the phylogenetic positions of these groups Identify major groupings within the Ecdysozoa and Echinodermata; describe distinguishing features among groups, where on Earth these organisms are typically found and how they make a living When presented with an organism belonging to one of the above groups, or when presented with a description of the organism, correctly diagnose the group to which it belongs Calcarea and Silicea Which of the following groups includes the Platyhelminthes? A. Deuterostomia B. Ecdysozoa C. Lophotrochozoa D. Cnidaria E. None of the above ANCESTRAL PROTIST Common ancestor of all animals Eumetazoa Bilateria Cnidaria Lophotrochozoa Ecdysozoa Deuterostomia Most species on Earth are Arthropods Arthro = jointed Arthropod groups extinct extinct Subphylum Crustacea: mostly aquatic animals with two pairs of antennae (at some stage in development) Phlyogenetic relationships among Crustacean Classes are not clear
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2 Class Malacostraca : Fused segments divided into head, abdomen and thorax; usually 5 pairs of legs, the first being pincers thorax abdomen head crabs, lobsters, shrimp, krill, amphipods, isopods Sub-Phylum Crustacea Class Cirripedia : cirri (specialized legs) are used for filter feeding Calcium carbonate shell Class Cirripedia Sub-Phylum Crustacea
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04_Feb25_slides - LearningObjectives Identify diagnostic...

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