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Related Flashcards
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Cards In This Set
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What skeletal features are indicative of bipedalism?
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Bicondylar angle
Rotated ilium Anteriorly located foramen magnum |
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What does medial mean?
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Closer to the midline of the body.
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What does lateral mean?
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Closer to the outside of the body.
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What does distal mean?
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Further from the joint.
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What does proximal mean?
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Closer to the joint.
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What is a derived trait and why is it important?
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Derived traits are traits that are distinct from the common ancestor. This is important for classification purposes.
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What is a primitive trait and why is it important?
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A primitive trait is the same as it was in the common ancestor. This is useful in determining where it falls in order of history.
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What is a homology?
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A homology is a trait that is similar in two species because they shared a common ancestor.
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What is an analogy?
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An analogy is a trait that is similar in two species due to the environment, not because of common ancestry.
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What are the different forms of primate locomotion?
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Bipedalism: walking on two legs.
Quadrapedalism: walking on four legs. Knuckle walking: using the base of the knuckles to walk. Brachiation: using long arms to move along branches Vertical clinging and leaping: Leaping from branch to branch. |
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What characteristics do all primates share?
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Arboreal adaptation, dietary plasticity, and increased parental investment.
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What are the unique characteristics of the Strepsirhini? What types of primate belong to this family?
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No post orbital closure, unfused mandible, tooth comb, relatively smaller brain, laterally oriented orbits, tapetum lucidum, molars with high, pointy cusps, longer snout, wet rhinarium, split upper lip, grooming claw. This includes lemurs and lorises.
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What are the unique characteristics of the Haplorhini? What types of primate belong to this family?
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Post orbital closure, no tooth comb, more forward orientation of orbits, no tapetum lucidum, fused mandible, molars with flatter cusps, shorter snout, dry nose, continuous upper lip, nails on all digits. This includes tarsiers, New and Old world monkeys, apes, and humans.
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What is unique about the tarsier?
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They are vertical clingers and leapers, huge orbits, unfused mandible, grooming claw, molars with sharp pointy cusps.
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What are the characteristics of the Platyrrhini? What types of primate belong to this suborder?
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Side directed nostrils, dental formula of 2133, no bony ear tube, some with prehensile tail. This includes New World monkeys.
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