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Zoology lab > Porifera > Flashcards

Porifera Flashcards

1
Q

How do they get their food?

A

Choanocytes: filter feeders

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2
Q

What symmetry do they have?

A

Radial or asymmetrical

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3
Q

List from smallest to biggest: sycon, leucon, ascon

A

ascon, sycon, leucon

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4
Q

What are the ostia?

A

Where water enters the sponge

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5
Q

What is the spongocoel?

A

Cavity in the sponge

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6
Q

What is the osculum? Who has one?

A

Where water exits, ascon and sycon have them

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7
Q

What are the choanocyte layers like in leucon?

A

Pockets. In sycon, they are called canals (?)

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8
Q

What is associated with ascon?

A

Calcarea

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9
Q

What is Calcarea?

A

Ca2+ spicules, marine, small (asconoid), radia symmetry, vase/tube… Granita, Leucoslenia, Sycon

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10
Q

What is associated with sycon?

A

Hexatinellida, Calcarea

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11
Q

What is Hecatinellida?

A

Si2+ spicules with six points, marine, radial (vase), taller than Calcarea… glass sponge

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12
Q

What is associated with Leucon?

A

All three clases

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13
Q

What is Demospongiae?

A

Largest, marine or freshwater (only freshwater), spongin forms body (protein skeleton)… Cliona

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14
Q

What is the excurrent canal?

A

Osculum in leucon

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15
Q

What is mesohyl?

A

The ‘body’ of the sponge, under the pinacoderm but above the choanoderm

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16
Q

What is gemmule?

A

Internal bud for asexual reproduction.

17
Q

What is the structure of choanocytes?

A

Microvilli collar, flagellum, nucleus

18
Q

What is a larval sponge

A

a parenchymula which can disperese

19
Q

Is preproduction internal or external?

A

external through buds

20
Q

Sponges are typically monoecious which means…?

A

Hermaphrodite

21
Q

What kinds of asexual preproduction are there?

A

Budding, fragmentation, gemmules

22
Q

What is phenotypic plasticity

A

the ability of individual genotypes to produce different phenotypes when exposed to different environmental conditions (like shape and size)

23
Q

What are the roles of spongin, spicules, and collagen?

A

to stiffen the body wall

24
Q

Is a spongocoel a secondary body cavity?

A

No

25
Q

What are they symbionts of porifera?

A

There can be both mutualistic and commensalistic relationships. bacteria, fish, green algae, shrimp

26
Q

How do porifera preproduce?

A

Asexually: budding, gemmules, regeneration from fragmentation. archaeocytes in gemmules can survive tough conditions
Sexually: monoeicious (hermaphrodites), the zygote forms a free swimming larva (parenchymula)

27
Q

When did sponges appear in the fossil record?

A

Over 500 million years ago

Zoology lab (3 decks)

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