Mammal Subclasses Flashcards
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Questions and Answers

What order does the Prototheria subclass belong to?

  • Theria
  • Dasyuromorphia
  • Monotremata (correct)
  • Didelphimorphia
  • What is a notable feature of the platypus within its subclass?

    no lacrimal

    Which of the following is an order within the Theria subclass?

  • Rodentia
  • Carnivora (correct)
  • Sirenia
  • Monotremata
  • What are the incisors configuration for opossums in the Metatheria infraclass?

    <p>5/4</p> Signup and view all the answers

    What is a unique dental feature of the Tasmanian devil?

    <p>incisors (3/4), crushing molars</p> Signup and view all the answers

    Which mammal from the order Diprotodontia has a large first lower incisor?

    <p>kangaroo</p> Signup and view all the answers

    What defines the dental pattern of a manatee?

    <p>no upper incisor, lophodont teeth</p> Signup and view all the answers

    What is the dental trait of hyraxes?

    <p>incisors (1/2) with crescent shaped cusps</p> Signup and view all the answers

    What distinguishing features do elephants have regarding their teeth?

    <p>incisors are tusks, large cheek teeth, no canines</p> Signup and view all the answers

    What is unique about the first upper incisor of elephant shrews?

    <p>enlarged</p> Signup and view all the answers

    What is a dental characteristic of anteaters and sloths in Xenarthra?

    <p>no / reduced dentition</p> Signup and view all the answers

    What facial feature is notably positioned in monkeys?

    <p>orbit forward facing</p> Signup and view all the answers

    What is a characteristic of tree shrews related to their incisors?

    <p>2nd incisor enlarged</p> Signup and view all the answers

    What defines the dental structure of colugos?

    <p>comblike lower incisors</p> Signup and view all the answers

    Which animal group has perforated maxillae and particular incisor arrangement?

    <p>rabbits</p> Signup and view all the answers

    What is a defining characteristic of the Rodentia order?

    <p>1 upper and lower incisor pair with no canines</p> Signup and view all the answers

    What is a distinct feature of shrews in the Eulipotyphia order?

    <p>large nasal with expanded maxilla, enlarged 1st upper incisor and 1st &amp; 2nd lower incisors, no palatine</p> Signup and view all the answers

    What is characteristic of small bats' cranial structure?

    <p>very small with domed cranial</p> Signup and view all the answers

    What defines large bats' cheek teeth?

    <p>degenerated cheek teeth</p> Signup and view all the answers

    What dental features are notable in the order Carnivora?

    <p>carnassials, 1st incisor smallest with 3rd incisor largest</p> Signup and view all the answers

    What is a dental characteristic shared by rhinos, tapirs, and horses?

    <p>alisphenoid canal, lophodont cheek teeth</p> Signup and view all the answers

    What do cows and giraffes possess instead of an alisphenoid canal?

    <p>selenodont / bunodont</p> Signup and view all the answers

    What unique feature do whales and dolphins' skulls have?

    <p>skull telescope</p> Signup and view all the answers

    What is a defining feature of the nostrils in cetaceans?

    <p>high nostrils</p> Signup and view all the answers

    Study Notes

    Prototheria and Monotremata

    • Subclass: Prototheria
    • Order: Monotremata
    • Example: Platypus
    • Notable for lacking lacrimal glands.

    Theria and Metatheria

    • Subclass: Theria
    • Infraclass: Metatheria
    • Order: Didelphimorphia
    • Example: Opossum
    • Characterized by dental formula: incisors (5/4).

    Dasyuromorphia

    • Subclass: Theria
    • Infraclass: Metatheria
    • Order: Dasyuromorphia
    • Example: Tasmanian devil
    • Dental features: incisors (3/4) and crushing molars.

    Diprotodontia

    • Subclass: Theria
    • Infraclass: Metatheria
    • Order: Diprotodontia
    • Example: Kangaroo
    • Distinctive feature: large protruding first lower incisor.

    Sirenia

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Sirenia
    • Example: Manatee
    • Lacks upper incisors and has lophodont teeth.

    Hyracoidea

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Hyracoidea
    • Example: Hyraxes
    • Incisors have a unique structure: (1/2) with crescent-shaped cusps.

    Proboscidea

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Proboscidea
    • Example: Elephants
    • Notable morphology: incisors develop into tusks, lack canines, and possess large cheek teeth.

    Macroscelidea

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Macroscelidea
    • Example: Elephant shrew
    • Unique dentition features: enlarged first upper incisor.

    Xenarthra

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Xenarthra
    • Examples: Anteaters and sloths
    • Recognized by reduced or absent dentition.

    Primates

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Primates
    • Example: Monkeys
    • Denoted by forward-facing orbits.

    Scandentia

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Scandentia
    • Example: Tree shrews
    • Characterized by enlarged second incisors and fully encircled orbits.

    Dermoptera

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Dermoptera
    • Example: Colugos (flying lemurs)
    • Features comb-like lower incisors.

    Lagomorpha

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Lagomorpha
    • Example: Rabbits
    • Notable for perforated maxilla and specific incisor arrangement.

    Rodentia

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Rodentia
    • Examples: Squirrels, beavers, other rodents
    • Dental formula includes one upper and one lower incisor pair, absent canines.

    Eulipotyphia

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Eulipotyphia
    • Example: Shrews
    • Distinguishing features include large nasal area, expanded maxilla, and multiple specialized incisors.

    Chiroptera

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Chiroptera
    • Suborder: Microchiroptera
    • Example: Small bats
    • Notable for very small body size and domed cranial structure.

    Megachiroptera

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Chiroptera
    • Suborder: Megachiroptera
    • Example: Large bats
    • Characterized by degenerated cheek teeth.

    Carnivora

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Carnivora
    • Examples: Dogs, cats, bears
    • Recognized for carnassial teeth; the first incisor is the smallest while the third incisor is the largest.

    Perissodactyla

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Perissodactyla
    • Examples: Rhino, tapir, horse
    • Unique features include an alisphenoid canal and lophodont cheek teeth.

    Cetartiodactyla

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Cetartiodactyla
    • Suborder: Artiodactyla
    • Examples: Cows, giraffes
    • Dentition includes selenodont or bunodont teeth; lacks alisphenoid canal.

    Cetacea

    • Subclass: Theria
    • Infraclass: Eutheria
    • Order: Cetartiodactyla
    • Suborder: Cetacea
    • Examples: Whales, dolphins
    • Characterized by homodont teeth, a telescoped skull, and high nostrils.

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    Description

    Test your knowledge on mammal subclasses with this set of flashcards. This quiz covers various subclasses and their defining characteristics, including orders like Monotremata and Didelphimorphia. Perfect for students of mammalogy or anyone interested in learning about mammals.

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