Reptilia Flashcards

1
Q

Characteristics of clade Amniota

A

-amniotic egg
-dry skin with epidermal scales
-digits ending in claws
-internal fertilization, males typically with penis
-direct development, no larval forms
-no external gills, respiration via lungs
-ribs usually connected ventrally
Single occipital condyle

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2
Q

What is the primary advantage of amniote eggs

A

It allows them to loose their ties to standing water; don’t need to lay eggs in the water

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3
Q

Characteristics of order testudines

A

-anapsid skull
-body encased in a shell: dorsal carapace and ventral plastron
-pectoral and pelvic girdles are inside the rib cage
-toothless: keratinized cutting edge/beak

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4
Q

What animals are in order testudines

A

Turtles

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5
Q

Characteristics of order sphenodonta

A

-two living species in new Zealand
-well developed parietal eye
-gastralia
-uncinate ribs
-teeth in palatine bone (two rows of teeth in upper jaw)
-no tympanum/middle ear

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6
Q

Characteristics of order squamata

A

-loss of quadratojugal arch
-kinetic skulls
-males with paired copulatory organs
-two modes of tooth attachment: acrodont|irreplaceable, pleurodont|replaceable
-caudal autotomy
-skin is shed

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7
Q

What animals are in order squamata

A

Lizards, snakes

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8
Q

Characteristics of order crocodalia

A

-nostrils at tip of snout
-heavy dorsal osteoderms
-laterally compressed tail
-complete secondary palate
-gizzard
-foramen of panizza
-complex courtship and maternal care

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9
Q

What animals are in order crocodalia

A

Alligators, crocodiles

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10
Q

Parts of an amniotic egg

A

-chorion-gas exchange
-allantois-waste storage/gas exchange
-yolk sac-nutrients
-amnion-protectiom from desiccation and shock

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