1. Canal system of sycon

2. Introduction
Habitat :-Scypha is marine, colonial, branched and sedentary sponge of cosmopolitan
Commonly called as Urn-sponge.
Habits:-
Locomotion:-absent
Feeding:-omnivorous and holozoic. Digestion is intracellular.
Reproduction:- monoecious or hemaphrodite both sexual and asexual.
Show cross fertilization due to protogynous
Regeneration:-high restroative regeneration power

3. Canal system of sycon
Definition :-system of interconnected canals of different types present inside the sponge body. Also called aquiferous system

4. Components of syconoid canal system
Dermal ostia
Incurrent canal
Prosopyle
Radial canal
Apopyles
Excurrent canal
Spongocoel
Osculum

5. Types of canal system
Asconoid
Syconoid
leuconoid

6. Asconoid canal system Wall thin,unfolded
Formed of two layer outer pinacoderm and inner choanoderm
Minute opening called ostia present on wall
Mesoglea weakly develop and of uniform thickness
Choanocytes lines the whole of spongocoel.
Spongocoel opens by osculum.
Oscular fringe present on osculum

7. Route of water
Out side water
Spongocoel
Out side
Dermal ostia
osculum

8. Syconoid canal system Wall much thicker and folded.
Mesoglea thick may form cortex in certain area.
Dermal ostia may open into radial canal or through incurrent canal
Choanocytes are restricted in the radial canal only
Spongocoel narrow open out by osculum

9. Route of water flow Outside water Radial canal Spongocoel Outside
Dermal ostia
Internal ostia
osculum

10. Leuconoid canal system
Wall much folded than syconoid canal system
Dermal ostia openin incurrent canal either directly or through the hypodermal space
Choanocytes confined in flagellated chamber, formed by evagination of radial canal
Spongocoel either reduced, narrow or absent.

11. Significance of canal system
Carries microscopic food particles for nutrition
Carries oxygenated water for respiration.
Carries sperms for reproduction.
Carries out undigested food for egestion.
Carries out nitrogenous wastes for excreation.

12. Thanks……