Primary Homology Assessment, Characters and Character States
Characters of Phylum-Porifera
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Transcript of Characters of Phylum-Porifera
Commonly known
as Sponges
Multicellular level
of organization
Solitary/ colonial,
sessile
Vase-like
cylindrical,
tubular,
many
branched
Symmetry
radial
or
none
Body
wall:
3
Layers
Pinacoderm,
Mesenchyme,
Choanoderm
Cells
loosely
arranged,
no definite
layers
Body:
many
pores,
canals &
chambers
(water flow)
Choanocytes/
collar cells
line
special
chambers
Osculum present
Skeleton:
calcareous/
siliceous or
spongin
fibers
Digestion:
Intracellular
Respiratory
excretory
organs
absent
Contractile
vacuoles
in
some
Nervous
system
primitive
Hermaphrodite
but
cross
fertilization
is rule
Asexual
reproduction:
budding/
gemmules
Sexual
reproduction:
ova
&
sperms
Regenerative
power
Free
swimming
ciliated
larva
Cleavage
holoblastic
Development
indirect
Amphiblastula/
Parenchymula
