BIO 200LLB Lecture Notes - Lecture 24: Binocular Vision, Strepsirrhini, Thumb
24 Oct 2018
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11/8/17
Lecture 24
Two primate traits:
Grasping hands (opposable thumbs)
- Dispensed claws.
- Allow us to grip limbs, hang, swing, grab food, and use tools.
- Flightless or poorly flying ratites.
- Fully opposable thumb (one digit that doesn’t full down but instead folds across)
- Flattened nails on our digits that keep pesky claws out of the way.
- Carpolestes simpsoni: fossils has grasping digits and an opposable big toe that has a nail
rather than a claw.
o Don’t have binocular vision.
Binocular vision
- Eyes in front of their head.
- Important because it produced overlapping binocular vision that allows us to judge depth.
Important for tree dwelling species for catching next branch and hunting.
Strepsirrhini (Wet nosed primates)
- Limited to Africa and Asia
- Large eyes and incredibly good vision: Probably because they are nocturnal and arboreal
- Known for elegant movement.
- Almost entirely herbivorous
- Lorises
- Lemurs:
o Madagascar (99 different species): Arrived after it broke away from the African
mainland by rafting over on logs or clumps of vegetation.
o Diurnal: Not nocturnal.
o Highly social and matriarchal: Females are dominate to male societies.
- Galagas or Bush babies
Haplorrhini (Dry nosed primates)
- Diurnal
- Color vision
- Tarsier:
o Behaviorally are more like nocturnal Strepsirrhini but genetically group with
haplorrhine.
- Known for their complex systems and intense parental care. Allows for a much longer
time of learning and brain development.
Platyrrhini (New World monkeys)
- Flat spreading noses. (Nostrils point outwards).
- Live in South America and Central America.
- Arboreal and almost all of them have long prehensile tails.
- Tamarins and Marmosets
- Squirrel monkeys
- Howler monkeys
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Document Summary
Allow us to grip limbs, hang, swing, grab food, and use tools. Fully opposable thumb (one digit that doesn"t full down but instead folds across) Flattened nails on our digits that keep pesky claws out of the way. Carpolestes simpsoni: fossils has grasping digits and an opposable big toe that has a nail rather than a claw: don"t have binocular vision. Important because it produced overlapping binocular vision that allows us to judge depth. Important for tree dwelling species for catching next branch and hunting. Large eyes and incredibly good vision: probably because they are nocturnal and arboreal. Lemurs: madagascar (99 different species): arrived after it broke away from the african mainland by rafting over on logs or clumps of vegetation, diurnal: not nocturnal, highly social and matriarchal: females are dominate to male societies. Tarsier: behaviorally are more like nocturnal strepsirrhini but genetically group with haplorrhine. Known for their complex systems and intense parental care.
