6th Grade Invertebrate Set

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Arthropod: Arachnids

2 body sections, 4-5 pairs of legs Examples: spiders, scorpions, ticks

Arthropod: Insects

3 body sections, (head, thorax, and abdomen), 3 pairs of legs and usually 2 pairs of wings, ex: flies, beetles, ants, grasshoppers, butterflies

Worms

3 types: flat (simplest worm, flat body, some live inside other animals), round (most live inside other animals), annelids-segmented (live on land and not inside other animals, ex: earthworms)

spider

arthropod-arachnid

tick

arthropod-arachnid

crab

arthropod-crustacean

lobster

arthropod-crustacean

grasshopper

arthropod-insect

anemone

cnidarian

jellyfish

cnidarian

chromatophores-squid

dark spots (pigment cells) that change the color of an organism, allowing it to camouflage

sea urchin

echinoderm

starfish

echinoderm

fins-squid

fanlike structures used for steering, balancing, and moving

gills-squid

feathery organs that exchange oxygen and carbon dioxide with water

Arthropod: Crustaceans

hard shell, 2-3 body sections, jointed appendages, live mostly in water, 2 pairs antenna, ex: crabs, shrimp, lobsters, crayfish,

butterfly

insect

Cnidarians

invertebrates that have stinging cells and take food into a central body cavity

Arthropod

largest invertebrate group, jointed appendages, segmented body with an exoskeleton (hard outer covering that protects)

tentacles-squid

long arm-like limbs with suction cups only on the ends, used for catching prey

clam

mollusk-bivalve

oyster

mollusk-bivalve

octopus

mollusk-cephalopod

squid

mollusk-cephalopod

slug

mollusk-gastropod

snail

mollusk-gastropod

sponges

porifera

ink sac-squid

produces ink ejected from the body to confuse and distract predators

countershade coloration-squid

protective coloration in an animal or insect, characterized by darker coloring of areas exposed to light and lighter coloring of areas that are normally shaded

pen-squid

remnant of the squid ancestor's shell, gives the mantle support and structure

Porifera

simplest invertebrates, no symmetry, cannot move, filter feeders (Example: sponges)

Mollusks

soft bodies, have a shell, some have shell on inside (slug, squid, octopus),some have shell on outside (snail, clams, oyster)

Echinoderms

spiny skin, endoskeleton (inside skeleton), ex:starfish, sea urchins, sand dollars, sea cucumbers, adults show radial symmetry (like a 5 pt star)

arm-squid

squid have 8, covered in suckers, used to bring food to the mouth

mantle-squid

the protective outer covering of the squid's internal organs

siphon/funnel-squid

tubelike structure through which water enters and leaves a mollusk's body, allows squid to use jet propulsion

beak-squid

used to tear food into small pieces

earthworm

worm-annelid

planarian

worm-flatworm

tapeworm

worm-flatworm

nematode

worm-roundworm


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