Exercise 18 Flashcards by Faith Swartz

Q

What are the four animal phyla?

A

Porifera
Cnidaria
Platyhelminthes
Rotifera

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Q

Porifera

A

sponges
asymmetrical
don’t have tissue

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Q

Cnidaria

A

jellyfish

- radial symmetry (circular)

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Q

Platyhelminthes

A

bilateral symmetry

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Q

Rotifera

A

bilateral symmetry

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Q

Animal characteristics

A

multi-cellular
heterotrophic
diploid; sexual reproduction more common
motility
larva form in many
germ layers

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Q

Porifera body organization

A

none

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Q

Porifera level of organization

A

cell specialization

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Q

Porifera body support

A

spicules, spongin fibers

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Q

Special characteristics of Porifera

A

pores, spongocoel, osculum, choanocytes (collar cells)

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Q

Collar cells

A

grab food

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Q

How are sponges classified?

A

based on what skeletal spicules they have

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Q

Class Calcarea

A

fragile

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Q

Class Demonspongiae

A

spongin fibers

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Q

Cnidaria habitat

A

mostly marine

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Q

Cnidaria body organization

Study These Flashcards

A

radial symmetry

Q

Cnidaria level of organization

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A

tissue (ectoderm and endoderm only)

Q

Cnidaria body support

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A

hydrostatic gut

Q

Cnidaria life cycle

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A

sexual reproduction, larva = planula, asexual reproduction

Q

Cnidaria special characteristics

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A

nematocysts, polyp, medusa

Q

Three classes of cnidarians

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A

Hydrozoa
Scyphozoa
Anthozoa

Q

Class Hydrozoa

Study These Flashcards

A

possesses both polyp and medusa stages

- hydra, Portuguese Man-of-War

Q

Class Scyphozoa

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A

Medusa only

- jellyfish

Q

Class Anthozoa

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A

Polyp only

- corals, sea anemones, sea fans

Nematocysts

capsule-like organelles within the stinging cells of cnidarians

Examples of Platyhelminthes

flatworms (tapeworms, Planaria, flukes)

Platyhelminthes body organization

bilateral symmetry, head, incomplete gut

Platyhelminthes level of organization

organ system (all three germ layers)

Platyhelminthes special characteristics

brain, flame cells