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Differentiate between the three classes of sponges with examples of each? Explain the three basic canal...

Differentiate between the three classes of sponges with examples of each? Explain the three basic canal systems? (Detail please)
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Difference between sponges

1)Asconoids;are small , simple forms with a tube-shaped body

2)Syconoids;also have a tubular body whose wall is much thicker and highly folded into a series of incurrent canals that deliver water into radial canals lined with choanocytes.

3)Leuconoid:the largest and most complex ones
-permits for an increase in body size

Canal system

I. Ascon type: in Leucosolenia. Incurrent pores/ostia→through mesenchyme→lead into spongocoel (lined by coanocytes) →open outside by osculum.


II. Sycon type: in Scypha/ Sycon, this is folded version. Incurrent canal, parallel to each other, dermal ostia→incurrent canal (on flagellated) →prosopyles (intercellular species) →radial canal (flagellated) →apopyles→spongocoel→osculum.


III. Leucon type/ rhagon type: in Spongilla, further folding, flagellated chambers are small and spherical cavities, excurrent canal are developed. Ostia–incurrent canals (not lined by choanocytes) →prosopyle→flagellated chambers (lined by choanocytes) → excurrent canals (much developed) →osculum (out). Spongocoel reduced and branches as excurrent canals.

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