Transcript Animal Kingdo

Animal Kingdom
Invertebrate Phylum
Porifera
The sponge
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Symmetry?
Germ layers?
Body cavity?
Level of organization?
Cool characteristics:
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Choanocytes
Amoeboid cells
Spicules/spongin
Mostly Asexual reproduction
sessile
Cnidarians
anthozoa, hydrozoa, scyphozoan
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Germ layers?
Body cavity?
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Cool characteristics
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Mesoglea
Cnidocytes, nematocysts
Gastrovascular system
2 body forms: polyp and medusa
Nemertea and Platyhelminthes
Ribbon worms and flatworms
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Germ layers?
Body cavity?
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Proboscis apparatus
Free living or parasitic flatworms
Cephalization
Gas exchange through diffusion
Nematoda and Rotifera
Roundworms and rotifers
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Germ layers?
Body cavity?
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Cool characteristics
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parasitic roundworms – Ascaris, Trichinella, filarial
worms – dogs (heartworm) humans (elephantiasis)
Crown of cilia – corona, locomotion
Protostomes
Deuterostomes
Mulluscs, annelids,
arthropods
 Spiral and determinate
cleavage
 Blastopore is mouth
 Coelom forms by a
splitting of the
mesoderm
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Echinoderms and
chordates
Radial and
indeterminate
Blastopore is anus
Coelom forms by
outpocketing of
primitive gut
Benefits of coelom
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Freer body movements – outer wall
independent of gut
Ample space allows for growth of organs
Fluid protects organs from damage
Storage for reproductive, digestive wastes
prior to being expelled
Hydrostatic skeleton – muscle contraction
against fluid in cavity
Mollusca
mulluscs
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Germ layers?
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3 part body plan (mantle, foot, visceral mass)
Open circulatory system in most
3 main classes
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Bivalves
Gastropoda
cephalopoda
Annelids
Segmented worms
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Marine worms, earth worms and leeches
Setae – bristles that anchor the worm
hermaphroditic
Arthropods
Jointed appendages
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Symmetry?
Germ layers?
Body cavity?
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Cool characteristics
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Exoskeleton of chitin, molt
Segmentation is modified for specialization
Well developed nervous system
Variety of respiratory organs
metamorphosis
Further classification of arthropods
3 subphyla of arthropoda
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Crustacea – crayfish, shrimp and craps
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Uniramia – centipedes, millipedes and insects
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Most aquatic, hard exoskeleton, compound eyes and 5 pair of
appendages.
Most live on land and breathe through trachea, thorax and abdomen
have only 1 pair of appendages
Chelicerata – horseshoe crabs, spiders ticks and mites
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Live in all environments, first pair of appendages are pinchers
(chelicerae), 2nd pair pedipalps (feeding)
Fused head and thorax, cephalothorax
Echinoderms
Spiny skin
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Primarily bottom dwellers
Larvae are free swimming filter feeders with bilateral
symmetry
Endoskeleton made of spiny calcium rich plates called
ossicles
Water vascular system - locomotion