Classifying Animals Flashcards

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1
Q

The 3 types of symmetry in animals

A

bilateral
radial
spherical

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2
Q

Definition of symmetry and asymmetry

A

S- body parts around central plane or axis

A- body can’t be divided into sections (sponges)

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3
Q

Definition of radial symmetry

A

body parts arranged around central point like spokes on a wheel
echinoderms
most are sessile or sendentary

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4
Q

Definition of bilateral symmetry

A

can be divided into equal halves along single plane

usually motile

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5
Q

Bilateral Symmetry: what type of images do they portray?

A

mirror images

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6
Q

When does segmentation occur?

A

When animal bodies are divided into repeating units/segments

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7
Q

Where is segmentation normally found?

A

in more complex animals

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8
Q

What type of segmentation do humans have?

A

internal

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9
Q

What type of segmentation do earthworms have?

A

external

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10
Q

The levels of organization

A

atom - molecule - organelle - cell - tissue - organ - organ system - organism

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11
Q

All organisms except for sponges show these levels….

A

cell, tissue, organ, organ system

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12
Q

Traditional Classification name

A

metazoans

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13
Q

Parazoa and Eumetazoa

A

P- lack symmetry and tissues

E- have symmetry and tissues

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14
Q

Diploblastic and Triploblastic

A

D- have 2 germ layers

T- have 3 germ layers

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15
Q

Animal classification is constantly ______.

A

changing

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16
Q

What are animals with distinct tissues called?

A

Eumetazoa

17
Q

What are the 4 chordate features?

A

embryo’s all have notochord
dorsal, hollow nerve chord
pharyngeal slits
postanal tail