6th Grade Invertebrate Set
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
