Invertebrates Animals with out Backbones Sponges Asymmetrical animals

Invertebrates Animals with out Backbones

Sponges Asymmetrical animals that are a variety of colors, shapes, and sizes

Sponges �Phylum Porifera- means pore-bearer �Sessile organisms �Filter Feeders �Feed by filtering small particles of food from water �Reproduction �Hermaphrodites- produce both sperm and eggs �Fertilization � Internal � External

Cnidarians Jellyfish, Corals, and Sea Anemones

Cnidarians �Two body forms �Polyp- the stage that has a tube-shaped body form with a mouth surrounded by tentacles �Medusa- body form shaped like an umbrella with tentacles hanging down �Digestion �Nematocyst- a capsule that contains a coiled, threadlike tube that may be sticky or barbed and contain a toxin. � Capture prey �Gastrovascular Cavity- a space inside the body where digestion takes place, one opening (Mouth)

Cnidarians �Nerve Net �Conducts nerve impulses from all parts of the body �No control center �Impulses produce contractions of the muscle like cells �Reproduction �Asexually- budding of the polyp �Sexually- eggs and sperm released into the water

Flatworms Tapeworms, Flukes, Planarians

Flatworms �Contain a brain like structure called the Ganglion �Sends messages to body through two nerve cords �Receive messages from Eyespots and Sensory Pits �Digestive System �Contains one opening the Mouth �Tapeworms and Flatworms are parasitic

Roundworms

Roundworms �Smaller then Flatworms �Tapered at both ends �First Animals with two openings in the digestive system �Free-living and Parasitic

Mollusks

Mollusks �Bilateral Symmetry �Two body openings �Muscular Foot �Mantle � A thin membrane that surrounds the internal organs � Secretes the shell

Mollusks �Gastropods- one shelled mollusk �Stomach-footed �Includes � Snails, Slugs, and Sea Slugs �Simple Nervous System � Small Brain and associated nerves �Circulatory System � Contain a heart � Have open circulatory system- heart pumps blood to vessels then to open spaces �First with Respiratory structures called Gills �First with Evolved Excretory structures � Nephridia- organs that remove waste from body

Mollusks �Bivalves- two shelled mollusks �Clams, oysters, and scallops �Sessile animals- filter feed �Cephalopods- head footed mollusks �Octopus, squid and chambered nautilus �Closed Circulator System �Foot is Tentacles �Advanced Nervous System

Segmented Worms Bristleworms, Earthworms, Leeches

Segmented Worms �Body divided into Segments �Allows for specialization � Bilateral with two digestive openings

Arthropods Jointed-Leg Animals

Arthropods �Jointed appendages allowed for more powerful movements and increased locomotion �Exoskeleton-protects and provides structure for internal organs �Most Molt (Shedding of Exoskeleton) in order to increase size �Respiration- three types of respiration structures �Gills- Crabs, Lobsters �Tracheal Tubes- branching networks of hollow air passages with openings in side called Spiracles- Insects �Book Lungs- air-filled chambers that contain leaflike plates. Spiders

Arthropods Groups of Arthropods �Arachnids- Spiders, Scorpions, Mites, Ticks �Crustaceans- Crabs, Lobsters, Shrimps, Crayfish, Barnacles, water fleas, Pill bugs �Centipedes �Millipedes �Insects

Echinoderms Starfishes, Brittle Stars, Sea Urchins and Sand Dollars, Sea Cucumbers, Sea Lilies and Feather Stars

Echinoderms �Contain an Internal Skeleton �Radial Symmetry �Water Vascular System- used to move, exchange gas, capture food, and excrete waste �Tube-Feet with Suction Cups on the end with the Ampulla (round muscular structure) on the opposite end that works like an eyedropper �Hydraulic water pressure system �Simple Nervous System-Nerve Net with cells that detect light and touch

Invertebrate Chordates Sea Squirts and Lancelets

Invertebrate Chordates �Contain no Backbone All Chordates have the following �Notochord- long, semi-ridgid, rod-like structure �Dorsal Nerve Cord- a bundle of nerves housed in a fluid filled canal above the notochord �Gill Slits

Invertebrate Chordates Sea Squirts �Sessile �As adults the y only contain Gill Slits �As larva they posses all the features common to chordates Lancelets �Retain all Chordate features in Adult life �Live in Borrows