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What Domain, Kingdom and Phylum does this belong to? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Does it have specialized tissues? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Can it bite you? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates What is this? What is missing from this? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates What Phylum does this belong to? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Does this have a mouth? Does it have a separate anus? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates How many different living organisms are shown? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Does this have true tissue (germ layers)? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Which phylum does this belong to? Does it have a foot? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Which phylum does this belong to? Does it have a foot? Mollusc - 3 body parts Visceral mass Foot Mantle (may make shell) porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Which phylum does this belong to? Does it have a foot? Gastropods - snails, conchs, nudibranchs Cephalopods - octopus, nautilus (tentacles) Bivalves - clams, oysters (two shells) porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Will this outgrow its shell? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Lophotrochozoa Lopho = tentacle-like feeding structure Trocho = larva with band of cilia Zoa = animal No molting, grow by adding body mass Lophotrochozoa grow by adding mass to body Parazoa sponges Radiata cnidarians Deuterostomes Protostomes flatworms mollusks annelids nematodes arthropods chordates pseudocoelom acoelom radial 2 germ layers deuterostome protostome Bilateral 3 germ layers True tissues / germ layers Origin of multicellularity echinoderms Will this outgrow its skeleton? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Will this outgrow its home? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Arthropods - jointed appendages - segmented - grow by molting / metamorphosis – CRUNCHY exoskeleton Insects - head, thorax, abdomen - 3 pairs of legs (wings) Arachnids Crustaceans - forked appendages - head and thorax fused - lobsters, crabs, crayfish - barnacles - pillbug (land) porifera cnidarians flatworms Origin of multicellularity - no antennae, mandible - 4 pairs of legs - spiders, scorpions, ticks - horseshoe crab Millipedes, centipedes (many legs) mollusks annelids nematodes arthropods echinoderms chordates Who is the hermit crab most closely related to? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates This also grows by molting…what phylum does it belong to? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Ecdysozoa - grow by molting Nematodes not segmented pseudocoelom Ecdysozoa Grow by molting Lophotrochozoa grow by adding mass to body Parazoa sponges Radiata cnidarians Arthropods Segmented Coelom Deuterostomes Protostomes flatworms mollusks annelids nematodes arthropods chordates pseudocoelom acoelom radial 2 germ layers deuterostome protostome Bilateral 3 germ layers True tissues / germ layers Origin of multicellularity echinoderms “worms” Nematodes aka roundworms Annelids aka segmented Platyhelminthes aka flatworms Nematodes grow by molting, the other two grow by adding tissue… Is it round, flat, or segmented? Does it have a coelom? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Is it round, flat, or segmented? Does it have a coelom? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Does it (a) have segments, (b) have jointed appendages, (c) go ‘crunch’ when you step on it? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Is it round, flat, or segmented? Does it have a coelom? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates “worms” Nematodes aka roundworms Annelids aka segmented Platyhelminthes aka flatworms Why are flatworms flat? “Excuse me, I’ve lost my anus…can you help me find it?” porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates What is going on here? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates How does this phylum’s embryo develop differently from other examples we’ve already looked at? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Are these adults radial or bilaterally symmetrical? What about when they were an embryo? porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms chordates Deuterostomes Echinoderm - usually radial symmetry - but larva is free-living bilateral - no head, brain, segmentation - nerves in a ring around mouth - simple respiratory, excretory, circulatory systems Ecdysozoa Grow by molting Lophotrochozoa grow by adding mass to body Parazoa sponges Radiata cnidarians Deuterostomes Protostomes flatworms mollusks annelids nematodes arthropods echinoderms chordates pseudocoelom acoelom radial 2 germ layers deuterostome protostome Bilateral 3 germ layers True tissues / germ layers Origin of multicellularity Starfish Sea urchin Sand dollar Sea cucumber Which is the starfishes closest relative? Sea squirt porifera cnidarians flatworms Origin of multicellularity mollusks annelids nematodes arthropods echinoderms Sea squirt (larva) chordates Which is the sea urchin’s closest relative? Sea squirt Sea anemone porifera cnidarians Sea urchin flatworms Origin of multicellularity mollusks Sea squirt (larva) Sea cucumber annelids nematodes arthropods echinoderms chordates Sea anemone Sea urchin Lophotrochozoa grow by adding mass to body Parazoa sponges Radiata cnidarians Sea squirt (adult) Sea cucumber Ecdysozoa Grow by molting Deuterostomes Protostomes (mouth first) Platyhelminthes (flatworms) mollusks Annelids (segmented worms) Nematodes (roundworms) arthropods echinoderms chordates pseudocoelom acoelom radial 2 germ layers deuterostome protostome Bilateral 3 germ layers True tissues / germ layers Origin of multicellularity Sea squirt (larva)
