Questions and Answers
What order does the Prototheria subclass belong to?
What is a notable feature of the platypus within its subclass?
no lacrimal
Which of the following is an order within the Theria subclass?
What are the incisors configuration for opossums in the Metatheria infraclass?
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What is a unique dental feature of the Tasmanian devil?
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Which mammal from the order Diprotodontia has a large first lower incisor?
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What defines the dental pattern of a manatee?
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What is the dental trait of hyraxes?
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What distinguishing features do elephants have regarding their teeth?
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What is unique about the first upper incisor of elephant shrews?
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What is a dental characteristic of anteaters and sloths in Xenarthra?
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What facial feature is notably positioned in monkeys?
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What is a characteristic of tree shrews related to their incisors?
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What defines the dental structure of colugos?
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Which animal group has perforated maxillae and particular incisor arrangement?
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What is a defining characteristic of the Rodentia order?
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What is a distinct feature of shrews in the Eulipotyphia order?
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What is characteristic of small bats' cranial structure?
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What defines large bats' cheek teeth?
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What dental features are notable in the order Carnivora?
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What is a dental characteristic shared by rhinos, tapirs, and horses?
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What do cows and giraffes possess instead of an alisphenoid canal?
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What unique feature do whales and dolphins' skulls have?
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What is a defining feature of the nostrils in cetaceans?
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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.
