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Phylum CnidariaCnidarians
Hollow, central body cavity with only one opening (cup shaped) “tube within a tube”
Nematocysts – special stinging structures around the mouth
Phylum PlatyhelminthesFlatworms
Live in ponds and streams, bottom of plants or rocks
Some live in animal or human host, others are freeliving
Phylum NematodaRoundworms
Have both a head end and a tail end with a digestive tube for food entrance and exits
Phylum AnnelidaSegmented worms
Setae – bristles that help the worm to move
Earthworms’ wastes enrich soil
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
Metamorphosis stage changes (egg to larva to pupa to adult)
Pheromones – powerful chemicals released to attract a mate
Univalves/Gastropods (one-shelled)
Live in ocean, freshwater, or on land (need moisture)
Radula files off bits of plants
Bivalves (two-shelled)
Bivalves are often called filter feeders because they spend most of their time straining water for food
Tentacled/Cephalopods
Number of tentacles for capturing food varies
Water jet propulsion for movement