Lecture_11_12_Sponges

Lecture_11_12_Sponges - Sponges, or Porifera Porifera is...

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Unformatted text preview: Sponges, or Porifera Porifera is non-monophyletic: three unrelated clades Sponges inform us about the earliest metazoan condition Sponge biology: the art of simplicity Feeding on active prey when sessile Reproduction No symmetry, 1 cell layer Motile Multicellular Heterotroph Key characteristics of sponges Sponges are considered the simplest of the Metazoa (multicellular organisms) in that they lack specialized organ systems. A lifestyle based on a cellular water pump--the choanocycte and food capture primarily by Flter feeding Structural support provided by diffuse, tiny skeletal elements made of inorganic spicules Sponges are classifed by their skeleton type Glass sponges: siliceous spicules, deep water Demosponges: siliceous spicules, also tough fbers oF the protein, spongin largest number oF species (95%), all Freshwater species, bath sponges Calcareous sponges: calcium carbonate spicules Demosponge Calcareous sponge Glass sponge Demosponge: Asymmetric body plan...
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Lecture_11_12_Sponges - Sponges, or Porifera Porifera is...

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