Phylum Porifera Flashcards
who coined the term “porifera”?
robert grant
poriferans that do not belong to marine water belong to the families?
spongillidae and potamolepidae (they belong to fresh waters)
poriferans generally belong to which waters?
marine
what kind of symmetry can be seen in porifera?
radial symmetrical/assymetrical
are they unicellular or multicellular?
multicellular
how many layers do the body wall of porifera have?
2
what is the outer layer called?
pinacoderm
what is the inner layer called?
choanoderm
what is the gelatinous matrix that separates the 2 layers called?
mesohyl
what are the minute pores in porifera called ?
ostia (inhalent aperture)
what is the central cavity in porifera called?
spongocoel
the spongocoel is also known as?
paragastric cavity
what is the exhalent aperture?
osculum
what cells line the spongocoel and the canals?
coanocytes/collar cells
what is the mode of nutrition in porifera?
holozoic nutrition
where is reserve food stored in?
thesocytes
are sensory and nerve cells present or absent?
absent
is the digestion extracellular or intracellular?
intracelluar
monoecious or dioecious?
monecious
poriferans reproduce by?
fragmentation,budding etc
is the fertilization holoblastic or not?
holoblastic
is the development direct or indirect?
indirect due to many larval stages
what are a few larval stages of porifera?
parenchymula,amphiblastula,trichemella
what are they also called as?
evolutionary blind offshoots
porifera is classified into?
3 categories (calcerea,hexactinellida,demospongia)
calcerea can be found in which waters?
shallow marine
calcerea spicules are/made up of?
calcereous/CaCO3
are calcerea solitary or colonial?
either solitary or colonial
examples of calcerea
sycon,leucosolenia,grantia
