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