MT Spr 08 03 ACOELOMATES

MT Spr 08 03 ACOELOMATES - ACOELOMATES PLATYHELMINTHES...

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ACOELOMATES PHYLUM PLATYHELMINTHES PHYLUM NEMERTINA
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The ACOELOMATE Condition Any triploblastic organism which lacks a body cavity is said to be an acoelomate. .. Lumen of gut Endoderm Ectoderm Mesoderm
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PLATYHELMINTHES ‘Flatworms’ ORGAN grade of body organization TRIPLOBLASTIC MESENCHYME = Middle layer derived from mesoderm germ layer = space-filling packing tissue ACOELOMATE - Mesoderm obliterates the blastocoel in the embryo
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PLATYHELMINTHES 3 main classes CLASS Turbellaria - Free-living flatworms CLASS Trematoda - Endoparasitic Flukes CLASS Cestoda - Endoparasitic Tapeworms
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Marine flatworms… But what we saw in lab was a freshwater flatworm. It was brown and looked as if it were boss- eyed.
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Note extensible pharynx (P), pharyngeal opening (PO), mouth PHYLUM Platyhelminthes CLASS Turbellaria M P PO PO P M I
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cs through anterior of organism [fig 3.4] aka Batman’s plane. Note No pharynx, only caeca PHYLUM Platyhelminthes CLASS Turbellaria Anterior Pharyngeal region Posterior
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c.s. through pharyngeal region [fig 3.4] Note
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MT Spr 08 03 ACOELOMATES - ACOELOMATES PLATYHELMINTHES...

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