Chapter 5: Primate Ecology and Diversity Flashcards
what is a homologous trait?
a trait that is common to several groups due to a shared common ancestor in the past
define viviparity
essentially giving birth to live offspring
what is homology?
the similarity in anatomy and behaviour due to common ancestry
what is analogy?
similarity in structure and function derived independently of one another (e.g wings of a bird vs wings of a bee)
nocturnal vs diurnal vs crepuscular
nocturnal: night dwelling
diurnal: day dwelling
crepuscular: dawn and dusk dwelling
what is sexual dimorphism?
the difference in body size of mature males and females
what are some common primate characteristics?
- grasping hands and feet
- nails instead of claws
- hind-limb driven locomotion
- forward facing eyes
- reduced smell, enhanced vision
- large brains
- long gestation
- small litters
- long lifespan
- long juvenile period
what is stereoscopic vision?
the ability to see images in 3D with depth perception
what are the 4 different kinds of teeth primates have?
incisors, canines, premolars and molars
what is the dental formula of humans?
2:1:2:3
what is brachiation?
the process of swinging between trees using only arms
arboreal vs terrestrial
arboreal: tree dwelling
terrestrial: land dwelling
what is the modern range of primates?
the Americas, Africa and Asia
what is the ancient range of primates?
included Europe and North America
what is the HUMAN line of primate taxonomy?
- primates
- haplorrhines
- semiformes
- catarrhine
- hominoidea
- hominidae
- hominini
- hominina
what are the two suborders in the taxonomy?
strepsirrhines and haplorrhines
what are some qualities of a strepsirrhine?
- “twisted nose”
- wet noses with a rhinarium
- tooth combs
- tapetum lucidum (night vision)
what are some qualities of a haplorrhine?
- “simple nose”
- dry nose
- no rhinarium
- has fovea rather than a tapetum (sharp vision)
what are the 4 infraorders in the taxonomy?
lemuriforms, lorisiformes, semiformes, and tarsiformes
what are the lemuriforms?
- lemurs
- adaptive radiation
what is adaptive radiation?
a rapid increase in the number of species with a common ancestor
what are lorisiformes?
- lorises, galagoes and pottos
- arboreal
what are tarsiformes?
- small, nocturnal insect eaters
what are the two parvorders following semiformes?
platyrrhines and catarrhines
what are some qualities of a platyrrhine?
- flat noses
- NEW WORLD MONKEYS
- outward facing nostrils
- only parvorder to have prehensive tails