Transcript Invertebrates

Invertebrates
Animals without a backbone
Phylum Porifiera: Sponges
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Filter Feeders
Move fluid and bodies by Choanocytes
Spines called spicules
Asymmetrical
Asexual and Sexual
– Hermaphrodites; produce eggs and sperm at
different times
Phylum Cnidarians: Jellyfish,
Hydras, Coral, Sea Anemone
• Radial Symmetry
• Two body Types Medusa and Polyp
– Medusa: Jellyfish
Anemone
Polyp: Hydra or Sea
• Cnidocytes: Harpooning cells to sting prey
• Only one body cavity for digestion.
Phylum Platyhelminthes:
Flat Worms.
• Bilateral Symmetry
• Flat bodies allows for diffusion of food and
gases.
• No circulatory or digestive system.
• Class Turbellaria: Marine flatworms
• Class Cestoda: Tape worms
• Class Trematoda: Flukes cause
schitsomiasis
Phylum Nematoda:
Roundworms
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Bilateral Symmetry
One way digestive system!!!!!
Pseudocoelum
Whip-like movement: muscles push against
body cavity.
• Trichinella- from uncooked pork
• Heart worm -Dogs
• Pin Worm – itchy anus
Phylum Molluska:
Snails, slugs, oysters, clams, octopus,
and squid
• Bilateral Symmetry
• True Coelum
– Allows for circulatory, respiratory, etc. systems
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Mantle surrounds body
Most have a Radula-Rasping tongue
Others have Beaks
One way digestive system
Phylum Molluska: continued
• All have sexual reproduction
• Gastropods: Snails and slugs
• Bi-Valves: Oysters, Muscles, and Clams (Filter
Feeders).
• Cephalopods: Nautilus (only one with shell),
Squids, Octopus, and cuttlefish
– Hightly Intelegent: well developed brain
– 1st closed circulatory system found in Octopus and
Squid.
– Giant Squid 15 inch eyes
Phylum Annelida: Earthworms
and Leeches
• 1st segmented Animals. Body is ring shaped
• Coelmates: True body cavities with two way
digestive systems
• Primitive brain = cerebral ganglia
• Nerve chord and blood vessels
• Light sensitive organs at both ends
• 5 hearts.
• Digestive system: Mouth to Esophagus to Crop
(storage) to Gizzard (grinding) intestine
(absorbing) to anus (out)
Phylum Echinodermata:
Starfish, Sea cucumbers, Sea Urchins
• Found in Oceans
• Spines cover body: sharp projections
• Tube feet use water to create suction and
move.
• Starfish: Mouth that is pushed out of the
body and liquefies prey.
• Can regenerate arms or Rays of Starfish.
Phylum Arthorpoda:
Lobsters, Spiders, and Ants
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Animals with jointed appendages.
Exoskeleton: Outgrow they Molt
Two or three body sections
Crustaceans: Lobsters, shrimp, crab. 2 body
sections, 10 legs. Breath with gills.
• Arachnids: Spiders, scorpions, ticks. Eat garden
pests: 2 body sections, 8 legs.
• Insects: Wasp, Ant, Grasshopper. 3 body sections
and 6 legs. Bad for crops. Good for honey and
silk. Food source for many
Economic importance of
Invertebrates
• Earthworms: Decomposers, make good
dirt.
• Ladybugs: Voracious Predators
• Crustaceans and Mollusks: Food Source
• Insects can be pollinators or destructive to
crops.
• Round and Flat worms: can be parasitic to
animals and plants- crop damage.
Ask about the Guinea Worm