lab3 key - ASM 104 SPRING 2008 NAME Laboratory 3 Primate...

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ASM 104 NAME: SPRING 2008 Laboratory 3: Primate Phylogeny (Evolutionary Relationships) Objectives: Understand characteristics that define the order primates. Understand and read diagrams of evolutionary relationships (cladograms) and the field of phylogenetics. Understand what characters define various groups of primates and how to define “character states.” Recognize monophyletic groups of primates. Part I. Primate characteristics in the skull Station 1 Two skulls have been labeled A and B. Compare these skulls as you answer the following questions: 1. Which way do the eyes face in Skull A? Sideways (1pt) 2. Which way do the eyes face in Skull B? Forward (1pt) 3. How does the relative position of the foramen magnum differ between these skulls? Skull A- it points posteriorly Skull B- it is rotated under the body (2pts) 4. Based on the answers to questions, is one of these skulls a primate? Which one, and why? Skull B is because it has 2 primate characteristics (3pts) Station 2 At this station there is the skull of an aye-aye (believe it or not, a primate) ( Daubentonia madagascarenesis ), and the skull of a rodent. 1. Compare the aye-aye and the rodent skull. What are three things about the aye-aye skull that make it a primate? 1. they should list three of the following: forward facing eyes, post-orbital bar, rounded braincase, face under braincase, foramen magnum rotated forward 1
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ASM 104 NAME: SPRING 2008 2. (3pts) 3. 2. What is a major difference between the aye-aye skull and another primate? The large honking incisors (ever-growing like a rodent’s) (1pt) 3. What is the aye-aye dental formula? 1.0.1.3/1.0.1.3 (1pt) **This particular individual had a formula of 1.0.1.3/1.0.0.3 Station 3 and 4 Because this will take a long time, there are two IDENTICAL stations. So, you only have to do Station 3 or Station 4, but NOT both.
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