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Figure CO 7. Simple, multicellular animals No organs or true tissues Asymmetrical Filter feeders. Types of cells in sponges. Water flow through a sponge. Reproduction in sponges. Reproduction in Sponges. Asexual Budding Gemmules (packets of cells in a resistant coating - PowerPoint PPT Presentation
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Figure CO 7
Simple, multicellular animalsNo organs or true tissuesAsymmetricalFilter feeders
Types of cellsin sponges
Water flowthrough a sponge
Reproduction in sponges
Reproduction in Sponges
AsexualBuddingGemmules (packets of cells in a resistant coating
Sexual reproductionHermaphroditicSperm or eggs released at any time/spongeInternal fertilizationCiliated larvae produced that swim in water
Settle on hard surface and create new sponge
The carnivorous “velcro”sponge (Family Cladorhizidae)
Hermit crab sponges
Hermit crab sponges reproduce with gemmules, spore-like structures, resistant to being dried out.
Hermit crabs prefer shells without sponges on them.
“Boring sponge” on a scallop shell. Major decomposer of calcium carbonate in ocean.
Phylum Cnidaria
Nematocysts (stinging cells)
Radial symmetry
Polyp and medusa form
Reproduce Asexually (budding)or Sexually (sperm and eggs)Planula larvae metamorphoses into adult
form.
Phylum CnidariaFeeding
carnivorous (use nematocysts)
and/or
photosynthetic (corals, anemones)cells contain zooxanthellae, symbiotic algae in the phylum Dinoflagellates
Phylum Cnidaria
4 major groups:
Anthozoans (corals, anemones, sea pens)
Hydrozoans (siphonophores, hydroids, fire corals, many medusae)
Cubozoa (box jellyfish)
Scyphozoa (Jellyfish)
Figure 7.5
Phylum Cnidaria
Hydroids- Siphonophores (above)(portuguese man-o-war)- Feathery hydroids(picture at right)
Polyp form is dominant.
Phylum Cnidaria
Box Jellyfish(Class Cubozoa)
Phylum Cnidaria: Jellyfish (medusa form only)
Phylum Cnidaria: Anthozoans corals and anemones, anemone shown above) (polyp form is dominant)
Phylum Cnidaria: Anthozoans (corals and anemones, coral shown above) (polyp form is dominant)
Figure 14.24
Figure 14.25
Figure 14.26
Figure 7.11
Phylum Annelida (segmented worms)Most marine annelids are polychaetes
Polychaetes living in tubes“tube worms”
Living polychaete
Feeding modes
Figure 7.29
Snail and radula
Figure 7.21d
Figure 7.20
Figure 7.25
Figure 7.24
Phylum Mollusca
Snails and limpets (Gastropods)
Mussels, clams, scallops, oysters (Bivalves)
Octopus, squid, cuttlefish (Cephalopods)
Chitons (Polyplacophora)
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