pinacocytes
thesocytes
choamocytes
scleroblasts
C. choamocytes
cells
cell organisation
cell division
division of labour
on the external body surface
line the gastric cavity
located between the outer and inner layers
in the mesodermal layer
siliceous spicules
spongin fibres
collagen fibres
elastic fibres
Planula
Stomogastrula
Amphiblastula
Terogastrula
Robert Grant
Trembly
Robert Brown
Ellias
Radial canal
Inhalant canal
Spongocoel
None of these
pinacocytes
thesocytes
choamocytes
scleroblasts
corals
sea pen
comb jellies
sponges
parenchyma
alanula
redia
amphib las tula
cold water
sea water
sandy shore
brackish water
Hyalonema
Tethya
Euplectalla
Pheronetna
ostea
gastral cavity
gut
gullet
porifera
gatropoda
coelenterata
ctenophora
porocytes
myocytes
choanocytes
none of these
calcarea
demospongia
anthozoa
hexactinellida
choanocytes
scleroblasts
pinacocytes
amoebocytes
calcarea
porifera
hexactinellida
demospongia
Cliona
Hyalonema
Chalina
Euspongia
protozoans
flagellates
choano flagellate
ciliates
sporozoa
mastigophora
porifera
coelenterata
coelomata
acoelomata
metacoelomata
pseudocoelomates
pinacocyte � choanocyte � osculum
osculum > spongocoel � ostia
ostia > spongocoel � osculum
osculum � ostia > spongocoel
gemmules
spicules
spongin fibre
trychocysts
water vascular system
canal system
feeding current
circulating current
amoebocytes
archeocytes
choanocytes
myocytes
Cartilage
Mesenchyma
Spicules and spongin fibres
Myonemes
One mouth and innumerable exits
Mouth serves for both, ingestion and egestion
Innumerable mouths and one exit
The body encloses a single cavity the coeienteron
adhere
rotate
be ingested
none of these
gemmules
spicules
spongin fibres
choanocytes
admit water current
pass out water current
ingest food
excrete waste products