Mammalogy Lab 1: Skull, Teeth, and Terms - | …goheen/mammalogy course/lab...Lab Rules •No food...
Transcript of Mammalogy Lab 1: Skull, Teeth, and Terms - | …goheen/mammalogy course/lab...Lab Rules •No food...
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Mammalogy Lab 1: Skull, Teeth, and Terms
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Goals of today’s lab
Be able to:
• Locate all structures listed on handout
• Define all terms on handout – what they
are or what they look like
• Give examples of mammals that have, or
lack, the features you are required to learn
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Lab Rules
• No food or drinks
• Handle specimens with clean hands
• Please don’t pet the mammal skins
• Skulls are VERY fragile. Careful when opening, or
closing boxes or vials with skulls.
• If you want to point to something on a skull or skin,
use your finger or the point of a folded up paper.
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Scientific Nomenclature
Kingdom, Phylum, Class, Order, Family, Genus, Species
• Orders and Families: first letter is always capitalized
– Most Orders in Class Mammalia end in “a”
– Most Families in Class Mammalia end in “idae”
• Specific Epithet:
– Genus (capitalized) followed by species (not capitalized)
– Written in italics OR underlined, but not both
– When keyed only to genus, customary to write the genus
followed by “spp.”
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Scientific Nomenclature
• Example: Western spotted skunk
Order: Carnivora
Family: Mephitidae
Genus: Spilogale or Spilogale
Specific epithet: Spilogale gracilis
or
Spilogale gracilis
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Grading
• Lab = 50% of your grade!
• Quizzes
– Worth 20 points each
– Lowest quiz dropped
– Beginning of labs, covering material from last lab
• Extra Credit
– Each quiz with 1-2 challenging extra credit questions
– Extra credit only applies to lab grade
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Points on Quizzes
For full credit, you will need to:
• Identify specimen correctly
• Follow nomenclature rules (underline, capitals)
• Spell things correctly
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Tips
• Look at scientific names for upcoming labs so
you know the Latin names ahead of time
• Use flash cards if they help you
• Work with your classmates
• Memorize as you go
• Make and use keys
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Useful Study Guide:
Animal Diversity Website at the
University of Michigan
http://animaldiversity.ummz.umich.edu/site/index.html
• Click on “mammals” tab
http://animaldiversity.ummz.umich.edu/site/accounts/s
pecimens/Canidae.html
• general site for skull structures, using canid skulls
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Dental formulae
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Dental formulae
2 41
3
Canis lupus = I3 C1 P4 M2
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Dental formulae
1
3
Canis lupus = I3 C1 P4 M2
i3 c1 p4 m3
1
4
3
3
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Dental formulae
1
3
Canis lupus = 3/3 1/1 4/4 2/3
or
3-1-4-2 / 3-1-4-3
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Dentition
Incisors: Usually unicuspid, often for grasping or cutting
• In primitive eutherians, 3 upper incisors per quadrant
• In metatherians, 5 upper incisors per quadrant
• Restricted to premaxilla
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Dentition
Canines: Unicuspid and single-rooted, often for holding
and stabbing
• Never more than 1 per side in cranium or mandible
• First teeth in the maxilla
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Dentition
Premolars: Unicuspid to multicuspid, vary in size and
function
• In primitive eutherians, 4 per quadrant
• In metatherians, 3 per quadrant
• Deciduous
• Typically with only one row of cusps
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Dentition
Molars: Biscuspid or multicuspid, vary in size and function
• In primitive eutherians, 3 per quadrant
• In metatherians, 4 per quadrant
• Fully erupted only in adults
• Typically with more than one row of cusps
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Dilambdodont = cusps comprised of “V”s
or “W”s.
Found in bats, shrews, moles.
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Bunodont = 3-4 rounded cusps.
Found in pigs, bears, raccoons, humans.
Dilambdodont = cusps comprised of “V”s
or “W”s.
Found in bats, shrews, moles.
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Dilambdodont = cusps comprised of “V”s
or “W”s.
Found in bats, shrews, moles.
Bunodont = 3-4 rounded cusps.
Found in pigs, bears, raccoons, humans.
Lophodont = elongated,
transverse cusps.
Found in many rodents.
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Dilambdodont = cusps comprised of “V”s
or “W”s.
Found in bats, shrews, moles.
Bunodont = 3-4 rounded cusps.
Found in pigs, bears, raccoons, humans.
Lophodont = elongated,
transverse cusps.
Found in many rodents.
Selenodont = cusps elongated
anterio-posteriorly.
Found in many ungulates.
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Characteristics of Mammalian Skulls
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Characteristics of Mammalian SkullsOccipital condyles
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Characteristics of Mammalian SkullsHeterodont dentition
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Characteristics of Mammalian SkullsTemporal fossa
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Characteristics of Mammalian SkullsMandibular fossa
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Skull Structures to Knowalisphenoid dentary
basioccipital maxilla
basisphenoid nasal
angular process occipital
auditory bulla occipital condyle
coronoid process orbit
cranium palatine
external auditory meatus parietal
foramen magnum postorbital process
frontal premaxilla
incisive foramina presphenoid
infraorbital canal/foramen pterygoid
jugal rostrum
lacrimal sagittal crest
squamosal mandible
temporal ridge zygomatic arch
mandibular condyle zygomatic process
mandibular (glenoid) fossa
Characteristics of mammalian skulls covered in test 1