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- Important primary light producers
- Dinoflagellata: Any of numerous one-celled organisms bearing two dissimilar flagella and having characteristics of both plants and animals
-Important component of phytoplankton
-Produce bioluminescence.
-Can release toxins in large predators
- Nutrition among dinoflagellates is autotrophic, heterotrophic, or mixed; some species are parasitic or commensal. About one-half of the species are photosynthetic; even among those, however, many are also predatory. Although sexual processes have been demonstrated in a few genera, reproduction is largely by binary or multiple fission. Under favourable conditions, dinoflagellate populations may reach 60 million organisms per litre of water

-Examples include: sponges, corals, jellyfish, and flatworms, as well as within protists such as ciliates

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Phyla are families and genera that have some species that live in the sea and some that live on land

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-5-part radial symmetry (adults)
-bilateral symmetry (larvae); tube feet
-Water vascular system for locomotion and respiration
-Calcareous endoskeleton composed of separate plates or ossicles.
Examples include: sea stars, sea urchins, sea cucumbers; sand dollars.

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-Bilateral symmetry
-Sessile
-Always colonial
-Form a flat, hard crust or a soft bush.
-Hermaphroditic
-One class, Phylactolaemata, live only in freshwater
-Members of the phylum Bryozoa have been referred to as "moss animals" or "ectoprocts"

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-Bilateral symmetry
-Segmented body (head, thorax, abdomen)
-Jointed appendages; exoskeleton made of chitin that is shed or molted.
Examples include: insects, lobsters, shrimp, barnacles

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--Large, well defined muscular foot; slimy; bilateral symmetry; two shells.
Examples include: mussels, clams, scallops
-A bivalve can reproduce sexually or asexually.
-Filter feeders, using their gills to capture phytoplankton from the water.

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-Bilateral symmetry
-Segmented body
-Free living or in tubes
-Bristles on each segment.
Examples include: tube worms, fire worms

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-Large, well defined muscular foot; slimy; bilateral symmetry; "head-foot".
-Most intelligent, most mobile, and largest of all molluscs
-Tentacles, camera-like eyes, color changing skin
-Strictly marine
Sexually reproduces
-Most behaviorally and morphologically complex class in the phylum.
-The arms, tentacles, and funnel are all derivatives of the foot.
-The mantle surrounds the visceral sac and possesses strong muscles required for contraction of the cavity and respiration. An opening in the mantle cavity serves as an inhalant aperture, whereas the funnel serves as the exhalent aperture. All cephalopods have one pair of unciliated ctenidia within the mantle cavity, with the exception of Nautilus, which has two pairs of ctenidia. The movement of water over the ctenidia is controlled by muscular contractions of the mantle wall.
-All cephalopods are carniverous. The beak is at the entrance to the buccal cavity
-Two pairs of salivary glands.
-Locomotion is accomplished by jet propulsion
Examples include: octopus, squid, nautilus, cuttlefish

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-Large, well defined muscular foot; slimy
-Bilateral symmetry; one-shelled.
Examples include: snails, limpets, nutibranchs
-Asexual reproduction, but some snails are hermaphrodites and can reproduce sexually
-Are successful in all three major habitats: ocean, freshwater, and land

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-Bilateral symmetry
unsegmented body
-Very flat bodY
-One opening (acts as both mouth and anus).
Examples include: flatworms

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-Contain a notochord & hollow dorsal nerve cord
--Pharyngeal gill slits; post-anal tail.
Examples include: tunicates, sea squirts, lancelets, fish

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-Radial symmetry
-Contain nematocysts
-Ring of tentacles around a central mouth
-Polyp & medusa generations.
Examples include: jellyfish, coral, sea anemones; hydroids

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- Have pores
-Asymetrical
-Sessile
-No true tissues
-Sponges act as living pumps; drawing water and then expelling it.
-Reproduce sexually and asexually
-Has a larvae stage
-Examples include:sponges
-Coanocytes