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Invertebrate Unit

QuestionAnswer
closed circulatory system transports fluids in tubes through the body.
exoskeleton rigid, outer covering of an organism
invertebrate animal without a backbone
open circulatory system circulatory fluids are not contained within vessels (instead are free to move between tissues/organs with body cavity)
regeneration ability to regrow lost body parts
vertebrate animal with a backbone
water vascular system system of fluid-filled interal tubes that carry food, oxygen & waste.
asymmetrical objects that do not have symmetry
bilateral symmetry type of symmetry in which parts are arranged around a center line. Objects with this symmetry can be divided into two identical halves.
radial symmetry type of symmetry in which parts are arranged around a center point.
Animal Characteristics heterotrophs (consumers), multicellular, eukaryotes, lack cell wall, contain lysosomes, most can move, most reproduce sexually
Invertebrate Characteristics no backbone, most have nerves, gut, symmetry used to describe shape
Nerves sense change in environment, carry messages, allow oragisms to respond
Gut site of digestion
stinging cells structures on tentacles that Cnidarians use to sting their prey
Common Characteristics of Arthropods exoskeleton, segmented bodies, jointed limbs, well developed nervous system
Arachnids 2 body segments (cephlothorax, abdomen) & 8 legs
Insects 3 body segments (head, thorax, abdoment) & 6 legs
Echinoderm Characteristics spiny skin, 5 part body, tube feet, water vascular system, endoskeleton
segmented bodies characteristics that annelids & arthopods share (evidence of evolution)
Phylum Porifera Members of this phylum are covered with pores and have one large opening at the top of their body to excrete wastes.
Phylum Cnidaria Animals that belong to this phylum have a hollow central cavity, one opening, tentacles with stinging cells, and one of two body forms (polyp and medusa).
Phylum Platyhelminthes This phylum of worms have a flat body shape, bilateral symmetry, and can regenerate
Phylum Nematoda Worms that belong to this phylum have a round body structure
Phylum Annelida Animals that belong to this phylum are worms that have segmented bodies, a closed circulatory system, and bristles for burrowing.
Phylum Mollusca This phylum is broken into three groups (Gastropods, Bivalves, and Cephalopods) based upon the type of shell and muscular foot the animal has. Some of these animals have tentacles.
Phylum Arthopoda Members of this phylum have four common characteristics: exoskeleton, segmented body, jointed appendages and nervous system.
Phylum Echinodermata Members of this phylum have spiny skin, a five part body, endoskeleton, tube feet, and can regenerate.
Phylum Porifera sponges
Phylum Cnidaria jellyfish, coral, hydra
Phylum Platyhelminthes flatworms, planarian, flukes, tapeworm
Phylum Nematoda roundworms- hookworm & Trichinella
Phylum Annelida earthworm, leech, marine worms
Phylum Mollusca snails, slugs, squid, octopus, clams, oysters
Phylum Arthopoda insects, crustaceans, spiders, millipedes, centipedes
Phylum Echinodermata starfish, sand dollar, sea urchin, sea lilly
Created by: jmebuckley
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