Lecture 34: Aves and Mammals Flashcards

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1
Q

Shared common ancestor with birds?

A

Archaeopteryx

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2
Q

Class Aves?

A

Birds and crocs are extant group of archosaurs

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3
Q

Modern bird characteristics?

A

Amniotic egg
Scales on legs
Endothermic

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4
Q

Adaptations for flight

A
Hollow bones
feathers
reduced digits
Horny beaks
Gizzard
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5
Q

Precocial

A

Young feed themselves

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6
Q

Altricial

A

Born helpless and featherless

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7
Q

Bird ecology?

A

Terrestrial, freshwater, marine

preds, herb, scav, and omni

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8
Q

Amniote Phylogeny?

A

Reptilia (birds) and Synapsida (mammals)

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9
Q

Synapsids?

A

Hole in skull

non mammals extinct

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10
Q

Therapsids?

A

Enlargment of dentary bone on jaw

Bony secondary palate

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11
Q

Class mamalia characteristic?

A

movement of leftover jaw bone to middle ear
Mammary glands
Endothermic
Dentition different from reptiles

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12
Q

Monotreme clade?

A
platypus and echidnas
Oviparous (lay eggs)
Cloaca
Lack teeth
Feed on invertebrates
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13
Q

Mammals with placenta

A

Marsupials and eutherians

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14
Q

Marsupials?

A

Born as partially developed embryo

Crawl to mother’s pouch

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15
Q

Eutherians?

A

nourish young via placenta till well developed
then milk
no cloeca

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