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Invertebrates Eight Major Phyla
Phylum Porifera Poriferans/Sponges Contains many pores Grows back together if cut or chopped up
Phylum Porifera Poriferans/Sponges Sexual and asexual reproduction Made of spicules
Phylum Cnidaria Cnidarians Hollow, central body cavity with only one opening (cup shaped) “tube within a tube” Nematocysts – special stinging structures around the mouth
Phylum Cnidaria Cnidarians Sexual and asexual reproduction radial symmetry
Phylum Platyhelminthes Flatworms Flat bodies Regeneration – grows part back digestive tract is tube
Phylum Platyhelminthes Flatworms Live in ponds and streams, bottom of plants or rocks Some live in animal or human host, others are freeliving
Phylum Nematoda Roundworms Resemble strands of spaghetti Live on land or in water Can be parasites
Phylum Nematoda Roundworms Have both a head end and a tail end with a digestive tube for food entrance and exits
Phylum Annelida Segmented worms Ringed Body is divided into several rings or segments – at least 100
Phylum Annelida Segmented worms Setae – bristles that help the worm to move Earthworms’ wastes enrich soil
Phylum Arthropoda Largest phyla of all animals All have jointed legs, exoskeleton, segmented body
Crustaceans Shed their exoskeleton (molting) Live in water and have gills Can regenerate some parts
Centipedes and Millipedes Centipedes have one pair of legs in a segment and are carnivores Millipedes have two sets of legs in a segment and are herbivores
Arachnids Bodies are divided into two main sections: A head- chest section and an abdominal section All have 8 legs Only arthropod w/o antennae
Insects Body is divided into three main sections: head, thorax (chest), and abdomen Has three pairs of legs, antennae, and most have wings
Insects Open circulatory system Shed their exoskeleton as they grow
Insects Metamorphosis stage changes (egg to larva to pupa to adult) Pheromones – powerful chemicals released to attract a mate
Phylum Mollusca Mollusks All have soft bodies All have a mantle to produce shell
Univalves/Gastropods (one-shelled) Live in ocean, freshwater, or on land (need moisture) Radula files off bits of plants
Univalves/Gastropods (one-shelled) Some inject poison, dangerous to people Moves along mucus
Bivalves (two-shelled) Move by clapping the two shells together
Bivalves (two-shelled) Bivalves are often called filter feeders because they spend most of their time straining water for food
Tentacled/Cephlopods Have some part of a shell within their body (except nautilus)
Tentacled/Cephalopods Number of tentacles for capturing food varies Water jet propulsion for movement
Phylum Echinodermata Echinoderms Name means “Spiny- skinned” Regenerate lost/broken body parts
Phylum Echinodermata Echinoderms Water vascular system five-part radial symmetry
You are done with the notes. Now you have everything you NEED to be ready for next week’s test. There is no excuse to do poorly - you have a week to prepare and memorize these facts!
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