Studied by 85 people
Study these 25 benthic families for our bronze level certificate.
Brown or olive-green in color
Providing habitat and food
Brown algae
Broad oral disk
Short tentacles
Upturned mouth in centre
Corallimorph
Flattened body
Exoskeleton
Single pair of claws
Crab
Hard calcium crust
Substrate for coral larvae
Crustose coralline algae
Calcium carbonate shell
Tentacles and sensory organs
Sea snails feed on algae
Sea snail
Flattened body shape
Opening both mouth and anus
Flatworm
Bright green color
Provide food and oxygen
Recycle nutrients
Green algae
Calcium carbonate skeleton
Reef builders
Polyps with x6 tentacles
Hard coral
Colonial animal
Growing on rocks
Bushy appearance
Hydroid
Umbrella-shaped bell
Trailing tentacles
Transparent appearance
Jellyfish
Tough exoskeleton
Pair of large claws
Long sensory antennae
Lobster
Sea snail without shell
Exposed respiratory gills
Nudibranch
Soft, bag-like body
Eight long tentacles
Tentacles lined with suckers
Octopus
Red in color
Blade structure
Red algae
Tubular body
Long tentacles
Inward turning mouth
Flat base attachment
Sea anemone
Long cylindrical body
Tiny tube feet
Filter-feeder
Sea cucumber
Narrow leaves and roots
Stabilize sediment
Sea grass
Five-point radial symmetry
Preying on mollusks
Sea star
Hard calcareous structure
Moveable spines
Sea urchin
Hard exoskeleton
Long, slender antennae
Often translucent
Shrimp
Polyps with x8 tentacles
Lack a hard skeleton
Soft coral
Simple body plan
No true tissues or organs
Filter water and recycle nutrients
Sponge
Built like a barrel
Two openings called siphons
Filter water and recycle nutrients
Tunicate
Growing as a dense mat
Living on muds and sands
Turf algae
Look like tiny sea anemones
Living in colonies
Tentacles are all marginal
Zoanthid
Note 
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