Sponges - Porifera

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Sponges - Porifera
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Phylum Porifera - sponges --- pore
bearing Kingdom Animalia -Metazoans Branch
Parazoa - near life symmetry - radial or
none no real tissues, organs or organ
systems they lack--- digestive, excretory,
respiratory circulatory, nervous (?),
muscular systems, and no appendages respirat
ion by diffusion ---gt surface to volume ratio
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S.A. (2 x 2) x 6 24 sq in (4 x 4) x 6 96
sq in V 2 x 2 x 2 8 cu in 4 x 4 x 4 64 cu
in SV 24 / 8 3 96 / 64 1.5
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Anatomy of an Asconid Sponge
Respiration Digestion Excretion
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Other types of sponges have a more complex body
walls, with foldings and convolutions
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Syconid sponges have simple folding of the
body-wall these folds form the walls of the
incurrent canals choanocytes are only in the
radial canals (the internal folds) and do not
line the spongocoel Leuconoid sponges have the
most complex body type many chambers with
choanocytes lining a flagellated chamber
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Structural support Spicules calcareous
CaCO2 siliceous SiO2
Secreted by sclerocytes
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Spongin - a soft, proteinaceous, fibrous material
for support
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Reproduction - asexual regeneration re-aggregat
ion and de-differentation budding
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Reproduction- sexual Dioecious - separate
sexes Monoecious - an individual has both
male and female reproductive components
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Choanocyte epidermis
Stomatoblastula
amphiblastula
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