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Zoology - Animal Diversity > Phylum Porifera > Flashcards

Phylum Porifera Flashcards

1
Q

who coined the term “porifera”?

A

robert grant

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2
Q

poriferans that do not belong to marine water belong to the families?

A

spongillidae and potamolepidae (they belong to fresh waters)

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3
Q

poriferans generally belong to which waters?

A

marine

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4
Q

what kind of symmetry can be seen in porifera?

A

radial symmetrical/assymetrical

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5
Q

are they unicellular or multicellular?

A

multicellular

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6
Q

how many layers do the body wall of porifera have?

A

2

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7
Q

what is the outer layer called?

A

pinacoderm

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8
Q

what is the inner layer called?

A

choanoderm

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9
Q

what is the gelatinous matrix that separates the 2 layers called?

A

mesohyl

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10
Q

what are the minute pores in porifera called ?

A

ostia (inhalent aperture)

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11
Q

what is the central cavity in porifera called?

A

spongocoel

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12
Q

the spongocoel is also known as?

A

paragastric cavity

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13
Q

what is the exhalent aperture?

A

osculum

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14
Q

what cells line the spongocoel and the canals?

A

coanocytes/collar cells

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15
Q

what is the mode of nutrition in porifera?

A

holozoic nutrition

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16
Q

where is reserve food stored in?

A

thesocytes

17
Q

are sensory and nerve cells present or absent?

A

absent

18
Q

is the digestion extracellular or intracellular?

A

intracelluar

19
Q

monoecious or dioecious?

A

monecious

20
Q

poriferans reproduce by?

A

fragmentation,budding etc

21
Q

is the fertilization holoblastic or not?

A

holoblastic

22
Q

is the development direct or indirect?

A

indirect due to many larval stages

23
Q

what are a few larval stages of porifera?

A

parenchymula,amphiblastula,trichemella

24
Q

what are they also called as?

A

evolutionary blind offshoots

25
Q

porifera is classified into?

A

3 categories (calcerea,hexactinellida,demospongia)

26
Q

calcerea can be found in which waters?

A

shallow marine

27
Q

calcerea spicules are/made up of?

A

calcereous/CaCO3

28
Q

are calcerea solitary or colonial?

A

either solitary or colonial

29
Q

examples of calcerea

A

sycon,leucosolenia,grantia

Zoology - Animal Diversity (9 decks)

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