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Invertebrates 3

Invertebrates 3 - Invertebrates 3 Bilaterian Lophotrochozoa...

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1 Invertebrates 3: Bilaterian Lophotrochozoa Concept 33.3 Lophotrochozoans Clade identified by molecular data have the widest range of animal body forms Belong to clade Bilateria Most members possess structure called a lophophore or go through a trochophore larval stage Very diverse group that includes 18 animal phyla Lophophore Concept 33.3 Lophotrochozoans, a clade identified by molecular data, have the widest range of animal body plans Very diverse group that includes 18 animal phyla Phylum Platyhelminthes or flatworms ~20,000 species of flatworms, living in marine, freshwater, and damp terrestrial habitats. Includes many parasitic species, such as flukes and tapeworms They may be flat, but they range in length from microscopic to tapeworms over 20 m long The Simplest Bilaterians Though structurally more complex than cnidarians or ctenophores, flatworms are simpler than other bilaterians Flatworms are the simplest triploblastic animals, with a middle embryonic tissue layer, mesoderm Mesoderm gives rise to several internal organs and to true muscle tissue Unlike other bilaterians, flatworms are acoelomates Four Classes of Flatworms
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