invertebrates & joint-legged animals
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Invertebrates & Joint-Legged Animals. SBI 3U October 18 th , 2012 Ms.Zafar. Invertebrates. Animal grouping No backbone Heterotrophic Why don’t they have cell walls?. We will be studying…. Phylum Mollusca Phylum Echinodermata. Phylum Mollusca. Shell Marine or terrestrial - PowerPoint PPT PresentationTRANSCRIPT
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Invertebrates & Joint-Legged Animals
SBI 3UOctober 18th, 2012
Ms.Zafar
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Invertebrates Animal grouping No backbone Heterotrophic Why don’t they have cell walls?
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We will be studying… Phylum Mollusca Phylum Echinodermata
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Phylum Mollusca Shell Marine or terrestrial Annelid-like ancestors
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Body Plan Foot Mantle Visceral Mass
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3 Classes Bivalva Cephalopoda Gastropoda
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Class Bivalva Shell-fish Two-part shell Why do they not need an anterior end? Gills
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Class Gastropoda Diverse Big foot Radula Gills Which mollusks have a lung?
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Class Cephalopoda Shell movement Brain development What has happened to the
cephalopod’s shell?
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Phylum Echinodermata Marine Symmetry shift Why might Echinoderms have radial
symmetry as adults? Endoskeleton
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Joint-Legged Animals
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Joint-Legged Animals Arthropods
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Phylum Arthropoda Segmented body Exoskeleton Hemocoel Coelom Gas exchange – gills & trachea
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Moulting in Arthropods Exoskeleton limits size
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Open Circulatory System Hemocoel Ancient annelids developed blood
instead of body fluid
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