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20 Cards in this Set

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  • Back
Radial Symmetry
Organisms tend to be sessile, passive ‘floaters’, or have limited sensory capabilities.
Phylum Porifera. Mostly marine.
Cells are loosely organized, no true tissues or organs.
Filter food particles using choanocytes.
Sponge Reproduction
Reproduce sexually (most hermaphrodites); or
Asexually by pieces breaking off (fragmentation).
Phylum Cnidaria
‘Nerve net’ organisms such as Medusa-jellyfish & Polyp-corals
In Cnidocytes, the stinging cell.
Cnidarian Classes
Class Hydrozoa;
Class Scyphozoa;
Class Anthozoa.
Class Hydrozoa
Hydras, Obelia
Meduse stage
Portuguese man of war
Class Scyphozoa
Meduas stage is common.
All marine
Most jellyfish, sea wasps,
Sea nettles.
Phylum Ctenophora
Comb jellies: all are marine.
8 rows of comb-like fused cilia used for locomotion.
Capture prey with long stick tentacles.
Many are bioluminescent!
Phylum Platyhelminthes
Flat worms.
Approx 20,000 species.
Fresh, marine, & terrestrial.
Phylum Platyhelminthes Anatomy
Simple digestive & excretory systems.
Nervous system more developed than cnidarians.
Cephalization, with some ability to learn responding to stimuli.
Live as parasites. Blood flukes.
Most species have complex life cycles.
Parasitic, mostly in vertebrates.
Up to 20m long…yummy!

Phylum Platyhelminthes
Phylum Nematoda
Round worms.
Approx 90,000 known species.
Extremely widespread.
Phylum Nematoda Anatomy
Complete digestive tract.
Longitudinal muscles produce thrashing motion.
Trichinella spiralis
Disease causing: trichinosis.
Results from eating undercooked pork.
Worm are encysted in the muscle. Bad news.
Phylum Mollusca
Snails, sea slugs, Radula
Clams, oysters, scallops.
2 halves of a shell.
Adductor mussels
Octopi, squid, nautilus.
Beak & injectable poison in mouth at center of arms & tentacles.