canine 1.1
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Flashcards in this deck (73)

  • What is the scientific name of the domestic dog?

    • Canis lupus familiaris

    Illustration of a gray wolf standing in the snow

    taxonomy dogs

  • To which family do domestic dogs belong?

    • Canidae
    taxonomy dogs

  • How are domestic dogs taxonomically related to the gray wolf?

    • Classified as a subspecies of the gray wolf (Canis lupus)
    taxonomy wolves

  • What does the text state about the ancestry of all domestic dogs?

    • All domestic dogs descend from extinct populations of wolves
    ancestry dogs

  • What is the domestication status of dogs relative to other animals?

    • Dogs are the earliest domesticated animal
    domestication dogs

  • What is the scientific taxonomy name for the domestic dog?

    Canis lupus familiaris

    taxonomy dogs

  • Name three deep ancestral genera in the canid lineage leading toward modern canids.

    • Miacis
    • Cynodictis
    • Tomarctus
    evolution ancestors

  • Which family diversified to produce the genus Canis?

    Canidae diversified and produced the genus Canis

    canidae taxonomy

  • What domestication pathway is associated with the origin of dogs?

    The commensal domestication pathway

    domestication pathway

  • What types of changes accompanied wolf-to-dog domestication?

    Both behavioral and genetic changes

    behavior genetics

  • How did dogs spread geographically after domestication?

    Dogs spread geographically with humans

    dispersal humans

  • Give an example image illustrating wolf-to-dog domestication (visual comparison).

    Visual comparison of wolf and dog faces: wolf and dog faces

    image illustration

  • From what broader group did modern dogs evolve?

    • Ancient canids
    evolution canids

  • Name an early canid ancestor that lived about 60 million years ago.

    • Miacis — 60 million years ago
    paleontology ancestors

  • Which early ancestor of dogs is specifically listed with an age of 60 million years?

    • Miacis

    Evolutionary lineage illustration

    image ancestors

  • When did Miacis live?

    • 62–33 million years ago
    paleontology timeline

  • What is Miacis in relation to modern carnivores?

    • Common ancestor of modern carnivores, including canids, felids, bears, and mustelids
    evolution canids

  • What were the main physical traits of Miacis?

    • Small, tree-dwelling, fox-sized mammal
    • Long tail, flexible body, unspecialized teeth

    Illustration of Miacis, a small, spotted mammal with a long tail.

    morphology traits

  • What evolutionary role did Miacis play for canids?

    • Provided the basic carnivore body plan from which all later canids evolved
    evolution canids

  • When did Cynodictis live?

    • About 40–30 million years ago
    timeline paleontology

  • What primary locomotor shift occurred in Cynodictis?

    • From arboreal to terrestrial locomotion
    locomotion morphology

  • Which limb and movement adaptations are noted for Cynodictis?

    • Longer limbs and cursorial (running) adaptations
    locomotion adaptation

  • How were the teeth of Cynodictis specialized?

    • Increasingly specialized for meat-shearing
    dentition diet

  • What is Cynodictis's significance in carnivore evolution?

    • Considered one of the earliest dog-like caniforms
    caniform evolution

  • What evolutionary event does Cynodictis mark?

    • Marks the divergence of the canid lineage from other carnivores

    Illustration of Cynodictis, an early dog-like caniform with longer limbs and adaptations for running.

    evolution canidae

  • When did the genus Tomarctus live?

    23–16 million years ago (Miocene)

    tomarctus timeline miocene

  • What aspect of the Tomarctus skull and teeth is highlighted in descriptions?

    • Wolf-like skull and dentition
    tomarctus morphology dentition

  • Which specialized teeth were well-developed in Tomarctus?

    • Carnassial teeth
    tomarctus teeth carnassial

  • How did the brain size of Tomarctus compare to its body?

    • Larger brain relative to body size
    tomarctus brain morphology

  • What social behavior was likely emerging in Tomarctus?

    • Social hunting behavior likely emerging
    tomarctus behavior social

  • What is Tomarctus often regarded as in canid evolution?

    • A direct ancestor of modern canids (wolves, foxes, and dogs)

    Illustration of Tomarctus, with the name “Tomarctus” below.

    Photograph of a Tomarctus skull fossil labeled 'Tomarctus euthos'.

    tomarctus evolution canids

  • During what time period did the major expansion of the Canidae family occur?

    Between 20 million and 5 million years ago.

    canidae timeline

  • What were the Borophaginae within Canidae?

    • The Borophaginae were extinct canids known as 'bone-crushing dogs'.
    canidae borophaginae paleontology

  • What were the Hesperocyoninae within Canidae?

    • The Hesperocyoninae were early small canids that are now extinct.
    canidae hesperocyoninae paleontology

  • What does the Caninae subfamily include?

    • The Caninae are modern canids, including wolves, foxes, jackals, and dogs.
    canidae caninae taxonomy

  • What is the temporal range of the genus Canis?

    • 6 million years ago–present
    canis evolution timeline

  • Name the species listed as included in the genus Canis.

    • Gray wolf (Canis lupus)
    • Coyotes (Canis latrans)
    • Jackals
    • Domestic dogs
    canis species taxonomy

  • Which species in genus Canis is identified by the scientific name Canis lupus?

    • Gray wolf (Canis lupus)

    Close-up portrait of a gray wolf face.

    canis canis_lupus wolf

  • Which species in genus Canis is identified by the scientific name Canis latrans?

    • Coyote (Canis latrans)

    Close-up portrait of a coyote face.

    canis canis_latrans coyote

  • What is the scientific name of the gray wolf?

    • Canis lupus

    Photograph of four gray wolves standing in a snowy landscape

    taxonomy canis

  • What is the common name for the species Canis lupus?

    • Gray wolf
    common-name canis

  • Approximately how long ago is the gray wolf indicated to have existed in the text?

    • 300,000 years ago
    timeline evolution

  • What is the scientific name and estimated origin timeframe of domestic dogs?

    • Canis lupus familiaris
    • 15,000–40,000 years ago
    taxonomy dogs

  • Did domestic dogs evolve by speciation or by another process?

    • Dogs evolved through domestication of wolves, not through speciation
    domestication evolution

  • Which animal was domesticated to produce modern domestic dogs?

    • Wolves

    Illustration of early humans and wolves

    wolves dogs

  • What scene is shown in this illustration?

    early humans with wolves

    Early humans traveling with wolves in a grassy area.

    illustration prehistoric

  • What items are the humans carrying in the illustration?

    humans carrying packs and spears

    • Packs
    • Spears
    artifacts tools

  • Which animal accompanies the humans in the illustration?

    wolves alongside humans

    Wolves

    animals canids

  • What behavioral change is a key evolutionary outcome of dog domestication regarding humans?

    Reduced fear and aggression toward humans

    domestication behavior dogs

  • Which morphological traits changed during dog domestication?

    Changes in skull shape and dentition

    morphology anatomy dogs

  • What social-cognitive ability was enhanced during domestication of dogs?

    Enhanced ability to read human social cues

    cognition behavior dogs

  • Which dietary genetic adaptation is associated with dog domestication?

    Genetic adaptations for starch digestion

    genetics diet dogs

  • Which physiological system was altered during dog domestication related to coping with stress?

    Altered stress-response pathways

    Illustration of two wolves near a campsite with bones on the ground

    physiology stress dogs

  • What commensal pathway likely initiated wolf domestication?

    Illustration of early humans inside a cave with a wolf.

    Early wolves likely initiated commensal relationships by scavenging near nomadic human camps.

    domestication dogs

  • Which traits did humans selectively breed in early domesticated wolves?

    • Hunting
    • Guarding
    • Companionship
    selectivebreeding traits

  • Summarize the basic domestication mechanism from wolves to early dogs.

    Wolves scavenged near camps forming commensal ties, then humans selectively bred them for useful traits.

    mechanism origins

  • Where and when did early human–wolf interactions occur that relate to canine domestication? map of Eurasia

    • Eurasia, 14–30,000 years ago
    domestication geography timeline

  • What was the ecological role of wolves during early interactions with humans?

    • Wolves: apex predators
    wolves ecology

  • How were the social structures of early humans and wolves described?

    • Both lived in groups; intelligent and highly organized
    behavior social

  • What food-related behavior caused competition between humans and wolves?

    • Both hunted the same food and tracked prey to exhaustion
    competition hunting

  • How long did the human–wolf rivalry last according to the summary?

    • A rivalry that lasted for thousands of years
    history interaction

  • What behavior did wolves commonly show toward humans according to the notes?

    Wolves don't attack humans but are quite prepared to steal their prey.

    wolves behavior domestication

  • Why did wolves live near human settlements?

    Wolves lived near human settlements for food scraps, acting as scavengers.

    wolves scavenging

  • Which wolves were kept by humans and why?

    Less aggressive wolves were kept because food from humans provided protection from other predators.

    domestication selection

  • What change occurred in wolf pups over time in the commensal pathway?

    Wolf pups eventually became more docile.

    behavior development

  • Which image illustrates humans and wolves around a fire as a commensal scenario?

    • person with torch and wolves
    • This image supplements the idea of wolves living near humans for food scraps.
    images commensal

  • When did the first dogs travel together with humans?

    • About 20,000 years ago
    history domestication

  • Where did the first dogs appear geographically?

    • Northern Hemisphere
    • Europe
    • Asia
    geography origins

  • What was the observed relationship between early dogs and humans?

    • They traveled together with humans
    behavior domestication

  • What physical appearance changes occurred in early dogs?

    • Lighter fur color
    • Floppier ears
    • Curly tails
    • Coat adapted to local climate

    human with dog illustration

    morphology evolution

  • 10,000 years ago humans traveled south to which regions?

    • Asia
    • Australia
    • America
    • Africa

    World map showing continents

    migration prehistoric

  • What coat change did dogs develop around 10,000 years ago?

    • Thinner coats
    dogs evolution

  • What role did pariah dogs in India play according to the notes?

    • Helped protect crops

    Photograph of a slender, tan-colored dog walking outdoors

    dogs behavior
Study Notes

Dogs — quick overview

  • Scientific name: Canis lupus familiaris, a subspecies of the gray wolf (Canis lupus).
  • Domestication: earliest domesticated animal; domestic dogs descend from extinct wolf populations.

Gray wolf illustration Alt: Gray wolf standing in snow.

Taxonomy & classification

  • Family: Canidae — includes wolves, foxes, jackals, coyotes, and dogs.
  • Subspecies: Canis lupus familiaris (domestic dog) derived from gray wolves.

Evolutionary timeline — key stages

1) Deep origins: Miacis (≈62–33 Ma)

  • Early, small tree-dwelling carnivoran that provided the basic carnivore body plan.
  • Not a dog, but an ancestral stock leading to later caniforms.

Miacis illustration Alt: Miacis, small spotted mammal with long tail.

2) Cynodictis (≈40–30 Ma)

  • Transition from arboreal to terrestrial life; longer limbs and running adaptations.
  • Teeth became more specialized for shearing meat; marks divergence of canid lineage.

Cynodictis illustration Alt: Cynodictis, early dog-like runner.

3) Tomarctus (≈23–16 Ma, Miocene)

  • More wolf-like skull and strong carnassial teeth; larger brain relative to body.
  • Likely social hunting behavior and often considered a direct ancestor of modern canids.

Tomarctus fossil Alt: Tomarctus skull fossil.

4) Canidae expansion (≈20–5 Ma)

  • Major subfamilies: Borophaginae (extinct, bone-crushers), Hesperocyoninae (extinct), Caninae (modern canids).

5) Genus Canis (≈6 Ma–present)

  • Includes gray wolves (Canis lupus), coyotes (Canis latrans), jackals and domestic dogs.

Gray wolves photograph Alt: Four gray wolves in snowy landscape.

Domestication of dogs — when and how

  • Timing: domestication occurred roughly 15,000–40,000 years ago; early dog-like forms present by ~20,000 years ago in the Northern Hemisphere.
  • Location: primary evidence points to Eurasia (multiple regions and times proposed).

Evolutionary lineage of the dog Alt: Evolutionary lineage from Miacis to Canis familiaris.

Mechanism: commensal pathway

  • Wolves likely approached human camps to scavenge food waste.
  • Less fearful, less aggressive wolves gained access to food and protection; humans tolerated and later bred them.
  • Selection favored traits useful to humans (hunting, guarding, companionship).

Early humans with wolves Alt: Early humans around a campfire with wolves nearby.

Key evolutionary changes during domestication

  • Behavioral: reduced fear and aggression toward humans; stronger sensitivity to human social cues.
  • Morphological: altered skull shape and dentition compared with wolves; variety of coat types and ear/tail shapes.
  • Physiological/genetic: adaptations for starch digestion and changes in stress-response pathways.

Geographic spread with human migration

  • By ~20,000 years ago, dogs traveled with humans across Europe and Asia.
  • By ~10,000 years ago, as humans moved to other continents, dogs dispersed and adapted: thinner coats in warmer regions and regional roles (e.g., crop protection by pariah dogs).

Map of Eurasia Alt: Map of Eurasia.

World map showing continents Alt: World map of continents.

Slender tan dog photograph Alt: Slender tan dog walking outdoors.

Practical takeaways (for study)

  • Domestic dogs are a subspecies of gray wolves; domestication is a process, not a sudden speciation event.
  • Domestication likely followed a commensal route: wolves scavenged human waste, leading to mutual association and selective breeding.
  • Key changes affect behavior, skull/dental morphology, digestion, and stress physiology—these are common topics in canine evolution and domestication studies.

Suggested quick-review checklist

  • Know the major ancestral stages: Miacis → Cynodictis → Tomarctus → Caninae → Canis.
  • Remember the commensal domestication model and its main predictions.
  • Recall main domestication traits: reduced aggression, social-cue sensitivity, morphological diversity, starch digestion adaptation.