Invertebrates

Life Science - Middle School

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Invertebrates Invertebrates are animals that have no backbone. The Animal Kingdom is broken down into groups called Phyla and all, except one, are invertebrates. Invertebrates are adapted for life in freshwater, salt water and on land. The Phylum Annelida is made up of segmented worms like earthworms (1) and leeches. The Phylum Nematoda has more than 25,000 species of tiny roundworms (2) mostly parasites. The Phylum Arthropoda has many groups (Classes) of invertebrates, all with protective exoskeletons and segmented bodies. One Class includes crabs (3), lobsters and shrimp (4) with protective outer shells and powerful pinching claws. Another Class includes barnacles (5), adapted for life in and out of the water with the changing tides . Another Class includes horseshoe crabs (6). All these Classes are found in wet environments. On land, more Arthropod Classes are: insects (7) with six legs , spiders (8) with eight legs , scorpions (9) with legs modified for grasping , and centipedes (10) and millipedes (11) with many legs. The Phylum Platyhelminthes are simple flatworms like the planaria (12). The Phylum Porifera includes sponges (13) attached to the ocean floor where they live on small bits of food brought by wave action. The Phylum Echinodermata includes starfish (14), sea urchins (15) and sand dollars (16). These animals may seem motionless but they are actually deadly predators. The starfish can work the shell of a mussel open and push its stomach out of its mouth and into the mussel, where it digests them. The Phylum Cnidaria contains jellyfish (17), coral (18) and sea anemones (19) that use poison stinging cells to stun their prey. The Phylum Mollusca has three groups (Classes), including one group with oysters, clams (20), and mussels (21) with hinged shells . Another group has squid (22) and octopuses (23) with changing camouflage, jets of water to escape predators and sharp beaks to stab prey. The third group includes snails (24) and slugs (25), many living on dry land . Land and Freshwater Invertebrates: Ocean Invertebrates: Phyla Arthropoda (Crabs, Centipedes, Insects, Spiders) Platyhelminthes (Flat Worms) Porifera (Sponges) Echinodermata (Starfish, Sea Urchins) Cnidaria (Coral, Jellyfish) Annelida (Segmented Worms) Nematoda (Round Worms) Mollusca (Snails, Clams, Octopi) Chordata (animals with backbones) 4 1 3 5 8 9 6 7 10 11 13 12 17 15 14 2 16 22 18 19 20 21 23 24 25
94-4033 18 Invertebrates are animals that have no _____________________________. The Animal Kingdom is broken down into groups called Phyla and all, except one, are invertebrates. Invertebrates are adapted for life in freshwater, salt water and on land. Land and Freshwater Invertebrates: Ocean Invertebrates: Invertebrates Phyla Arthropoda (Crabs, Centipedes, Insects, Spiders) Platyhelminthes (Flat Worms) Porifera (Sponges) Echinodermata (Starfish, Sea Urchins) Cnidaria (Coral, Jellyfish) Annelida (Segmented Worms) Nematoda (Round Worms) Mollusca (Snails, Clams, Octopi) Chordata (animals with backbones) The Phylum Annelida is made up of segmented worms like ________________________________ (1) and leeches. The Phylum Nematoda has more than 25,000 species of tiny _________________________ (2) mostly parasites. The Phylum Arthropoda has many groups (Classes) of invertebrates, all with protective exoskeletons and segmented bodies. One Class includes _____________________ (3), lobsters and ______________________ (4) with protective outer ________________ and powerful pinching claws. Another Class includes _________________________ (5) adapted for life in and out of the water with the tides . Another Class has _________________________ crabs (6). All of these Classes are found in wet environments. On land, more Arthropod Classes are: ______________________ (7) with six legs , _____________________ (8) with eight legs , __________________________ (9) with legs modified for grasping , and centipedes (10) and millipedes (11) with many legs. The Phylum Platyhelminthes are simple flatworms like the _____________________ (12). The Phylum Porifera includes sponges (13) attached to the ocean floor where they live on small bits of food brought by wave action. The Phylum Echinodermata includes ________________________ (14), ________________________ (15) and sand dollars (16). These animals may seem motionless, but they are actually deadly predators. The starfish works the shell of a mussel open and pushes its stomach out of its mouth and into the mussel, where it digests them. The Phylum Cnidaria contains ___________________________ (17), __________________________ (18) and _______________________________ (19) that use poison stinging cells to stun their prey. The Phylum Mollusca has three groups (Classes), including one group with oysters, ____________________ (20), and mussels (21) with hinged shells . Another group has ____________________ (22) and ______________________________ (23) with camouflage, jets of water to escape predators and sharp beaks to stab prey. The third group has ____________________ (24) and ____________________ (25), many living on dry land . 4 1 3 5 8 9 6 7 10 11 13 12 17 15 14 2 16 22 19 20 21 23 24 25