COURSE I FIRST SEMESTER PHYLUM PORIFERA Pore bearing animals exhibiting multicellular organization Prof. S D Rathod
Nov 28, 2014
COURSE I FIRST SEMESTER
PHYLUM PORIFERA
Pore bearing animals exhibiting multicellular organization
Prof. S D Rathod
Poriferans Poriferans are pore bearing,
multicellular, radially symmetrical animals
Canal systems opening by ostia and osculum
Endoderm lined by choanocytes Endoskeleton made of spicules
Diploblastic sponge
Class – Calcaria
All sponges belonging to this class are marine, shallow water dwellers.
Their endoskeleton is made up of calcareous spicules.
Example - Leucosolenia
Class – Hexactinellida
Spicules hexactinate marine, deep sea dwellers and
mostly solitary endoskeleton is made up of siliceous
spicules example - Euplectella
Venus flower basket – Euplectella
deep sea dweller
Class – Demospongia Mostly shallow water forms and
live organized and colonial, leuconoid canal system
Brightly colored and large in size Siliceous or calcareous spongine
fibres Example - Euspongia (Bath sponge)
Bath sponge
Sponges at sea
Thank you