Invertebrates Animals without a backbone Phylum Porifiera Sponges

Invertebrates Animals without a backbone

Phylum Porifiera: Sponges • • • 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 • • 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 • • 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 – 1 st closed circulatory system found in Octopus and Squid. – Giant Squid 15 inch eyes

Phylum Annelida: Earthworms and Leeches • 1 st 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 • • 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.

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