asconoid
syconoid
leuconoid
rhagon
C. leuconoid
Leucon type of Canal System
Further folding of the body wall leads to the formation of a more complex type of canal system known as the Leucon type of canal system. In this type, Incurrent Canals open into Flagellated Chambers through the Prosopyles. There is no Spongocoel, and instead the Excurrent Canals are present. The Flagellated Chambers open into the Excurrent Canals through the Apopyles. The Excurrent Canals open to the outside via the Osculum. Sponges having Leucon type of canal system are called as Leuconoid sponges, for example, Plakina, Geodia, Spongilla, Oscarella, etc.
pinacocytes
thesocytes
choamocytes
scleroblasts
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
choanocytes
porocytes
pinacocytes
amoebocytes
Scypha
Euspcmgia
Spongilla
None of these
parenchyma
alanula
redia
amphib las tula
digestion
sexual reproduction
asexual reproduction
current circulation
asconoid
syconoid
leuconoid
rhagon
trophocytes
thesocytes
desmocytes
archeocytes
porifera
gatropoda
coelenterata
ctenophora
porocytes
myocytes
choanocytes
none of these
is well developed
is in the form of a network
is made up of several interconnected ganglia
is absent
protozoans
flagellates
choano flagellate
ciliates
nutrition
respiration
excretion
sexual reproduction
coelomata
acoelomata
metacoelomata
pseudocoelomates
corals
sea pen
comb jellies
sponges
on the external body surface
line the gastric cavity
located between the outer and inner layers
in the mesodermal layer
admit water current
pass out water current
ingest food
excrete waste products
free living, solitary, marine
free living, fresh water, solitary
free living, colonial, marine
Solitary, colonial, fresh water
gemmulation
gemmation
regeneration
amphimixis
Robert Grant
Trembly
Robert Brown
Ellias
pinacocyte � choanocyte � osculum
osculum > spongocoel � ostia
ostia > spongocoel � osculum
osculum � ostia > spongocoel
Cartilage
Mesenchyma
Spicules and spongin fibres
Myonemes
planula larva
amphiblastula larva
trochophore larva
glochidium larva
corals
sponges
sea urchin
sea horse
cold water
sea water
sandy shore
brackish water
water vascular system
canal system
feeding current
circulating current
cells
cell organisation
cell division
division of labour
gemmules
spicules
spongin fibre
trychocysts
gemma
gemmule
bud
bulbul
sporozoa
mastigophora
porifera
coelenterata