Canal system of sycon Introduction Habitat Scypha is

Canal system of sycon

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

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

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

Types of canal system • Asconoid • Syconoid • leuconoid

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

• Route of water Out side water Dermal ostia Spongocoel osculum Out side

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

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

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.

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.

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