Kingdom Animalia

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Kingdom Animalia Invertebrates Phylum Porifera
Phylum Cnideria
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SPONGES
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Sponges Phylum Porifera (pore-bearers)/ simplest
animal Body Symmetry/Shape Asymmetrical
Segmentation None Coelom/body cavity
Acoelomates Nervous system No Cephalization Skele
ton/Movement Sessile, Endoskeleton-Spicules
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SPONGES
Digestion filter feeders / many pores
.Choanocytes are flagellated cells that pull food
in thru ostia (pores) and the amoebocyte cells
circulate food around the organism Excretion
diffusion wastes exit thru osculum Circulation
None Respiration diffusion-obtain oxygen from
water Reproduction sexual-Hermaphrodites(have
sperm egg)-Both sexes in same organism called
monoecious asexual- bud Regenerate body parts
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Sponge examples Uses
Examples natural kitchen sponges Uses
cleaning, bathing, makeup application
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Body structure A. Osculum water exits-part of
feeding B. Pore cells (ostia) water enters-part
of feeding C. Collar cells(choanocytes)- line
interior, have flagella to filter out food from
water D. Amoebocytes carry nutrients from collar
cells to body of the sponge E. Spicules-
support/skeleton F. Epithelial
cells-skin-support/protection
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Figure 268 The Anatomy of a Sponge
Section 26-2
Water flow
Osculum
Choanocyte(collar cells)
Central cavity
Pores
Spicule
Pore cell
Pore
Epidermal cell
Archaeocyte
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Cnidarians
Aurelia
Portuguese-man-of-war
Sea Aneome
Hydras
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Phylum Cnidaria- stinging cellpredators Germ
Layers 2 Body Symmetry/shape Radial, 2 body
forms Polyp Medusa Segmentation
noneCoelom Acoelomate Nervous Cephalization
absent Nerve Net-conducts impulses. Statocyst-
balance organ Skeleton/Movement Hydrostatic
nematocyst stinging cells found on tentacles
sessile or move
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Digestion one body opening for food
wastes Excretion Circulation none Respiration
oxygen diffuses into body from
water Reproduction asexual-budding-Polyp form-
ex. Hydra sexual-Medusa form- ex.
Jellyfish regenerates body parts
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Groups Uses of Cnidarians

• 3 Classes of Cnidarians
• 1. Hydrozoans colonies which appear to be one
  organism
• Ex Portuguese-man-of-war
• 2. Scyphozoans independent medusa forms
• Ex jellyfish, box jelly
• 3. Anthozoans colonies of polyps
• Ex corals, sea anemone
• Riches of the sea

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StructureThe Polyp and Medusa Stages
Epidermis Mesoglea Gastroderm
Medusa
Polyp
basal disc sticky structure at the bottom of
polyp sessile