BIO104-Porifera-LecOutline.docx - ACOELOMATE...

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ACOELOMATE & PSEUDOCOELOMATE PROTOSTOME INVERTEBRATES Phylum Porifera Phylum Cnidaria & Ctenophora Phylum Platyhelminthes Phylum Nematoda PHYLUM PORIFERA I. Characteristics A. MULTICELLULAR Aquatic  primarily marine B. ACOELOMATE  No body cavity containing organs C. CELLULAR Level of Organization  no true tissues or organs  no nerve or muscle cells D. ASSYMETRY  lack symmetry (or have Radial Symmetry) E. SESSILE (as adults) F. INTRACELLULAR DIGESTION Cellular excretion & respiration  diffusion G. Central cavity perforated with branching CHAMBERS , CANALS , and PORES . OSTIA  pores in body wall where water enters OSCULUM  central cavity SPONGOCOEL  large opening where water exits II. Cell Types A. PINACOCYTES  thin flat epithelial-type cells that serve as epidermal cells to form the pinacoderm (outer surface)
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Myocytes  specialized contractile pinacocytes located near the osculum and pores B. MESOGLEA  also known as the Mesohyl & Mesenchyme  gelatinous
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  • Summer '15
  • Flagellated Spongocoel, OSTIA  pores

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