Chapter 33 -1 Flashcards

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1
Q

Sponges are in what phylum?

A

porifera

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2
Q

What are the characteristics of porifera?

A

7000 marine species
sessile adults
swimming larvae

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3
Q

What are the 3 layers of the sponge/porifera?

A

outer epidermis
mesohyle
spongocoel

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4
Q

What happens in the outer epidermis?

A

water enters via incurrent ostia & exits through the osculum

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5
Q

What happens in the mesohyle?

A

middle gelatinous matrix containing amebocytes, spicules, and spongin

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6
Q

What happens in spongocoel?

A

inner layer lined with flagellated chaonocytes (collar cells) that circulate water

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7
Q

What are the 2 types of cells of porifera/sponges?

A

collar cells

amoebocytes

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8
Q

What are collar cells?

A

flagellated chaonocytes with feeding collars that circulate water

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9
Q

What are amoebocytes?

A

cells that move with pseudopods, clean pores, and secrete spicules & spongin

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