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A powerpoint presentation on Invertebrates. It includes the 8 classes of inverterbates and some examples for each phylum. Enjoy the presentation!
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INVERTEBRATES
Invertebrates Animals without backbones
97% of all animal species
Invertebrates
Phylum Molluska
Phylum Echinodermata
Phylum Platyhelminthes
Phylum Nematoda
Phylum Arthropoda
Phylum Cnidaria
Phylum Porifera
Phylum Annelida
PHYLUM PORIFERA (Sponges)
• “Porifera” means pore – bearing• lacks true tissues & organs; incomplete
digestive system • has skeleton that supports & protects the
body; made up of “spicules”
PHYLUM CNIDARIA
• Radially symmetric• digestive chambers with a single
opening, which serves as both mouth & anus
• Includes: hydras, jellyfish, corals and sea anemones
2 body forms: polyp form and medusa form 1. polyp form - cylindrical; mouth & tentacles at the upper end 2. medusa form – shaped like an upside-down bowl; mouth & tentacles facing downwardhas tentacles with stinging cells called “cnidocytes” that paralyzes their preys
PHYLUM CNIDARIA
Jellyfish -medusa
Coral - polyp
Hydra
JellyfishSea anemones
Coral
PHYLUM PLATYHELMINTHES (Flatworms)
• with flattened bodies; bilateral symmetry• lacks body cavity• most flatworms are parasites
• 3 major groups: flukes, planaria & tapeworms 1. Flukes – parasites that absorb the
nutrients from the body of a host harming it; causes a disease called schistosomiasis
2. Planarians – non-parasitic, lives in moist environments & free-living
3. Tapeworms – long ribbon-like flatworm; can infect humans through eating undercooked meat of an infected cow or pig
PHYLUM PLATYHELMINTHES (Flatworms)
Planaria
Fluke
Tapeworm
PHYLUM NEMATODA (Roundworms)
• has cylindrical bodies tapered at both ends & covered by a tough cuticle
• includes parasitic types: trichina, filaria, pinworms, & hookworms
• Many are introduced through poorly cooked pork or walking barefoot in contaminated areas.
• Some diseases caused by roundworms: elephantiasis, trichinosis.
Pinworm
TrichinaHookworms
Filaria
PHYLUM ANNELIDA (Segmented Worms)
• With segmented bodies which has a ringed appearance
• Includes: earthworms & leeches
PHYLUM MOLLUSKA (Mollusks)
• Second largest animal phylum• Includes: oyster, clams, snails, squids
and octopuses• Some are sources of food for
humans.
Oysters
Clams
Snail
Squid
Octopus
PHYLUM ECHINODERMATA (Spiny-skinned)
• Includes: starfish, sea urchin and sea cucumbers• Has internal skeleton for support &
protection
Starfishes
Sea cucumber
Sea urchins
PHYLUM ARTHROPODA (Arthropods)
• Largest group in the animal kingdom• Has exoskeleton; segmented body & joint
appendages• Divided into 4 groups: 1. Crustaceans – lobsters, shrimps, crabs & crayfish 2. Insects – ants, mosquitoes, bees, wasps, bugs & flies 3. Arachnids – spiders, mites & scorpions 4. Myriapods – centipedes & millipedes
LobsterShrimp
Crayfish
Hermit crab Crabs
Crustaceans
Name the insects!
Spiders
Scorpion
Ticks
Mites
Arachnids
Myriapods
The End