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15 Cards in this Set
- Front
- Back
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What are the 4 different types of symmetry?
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1. Asymmetric
2. Radial 3. Pentameral 4. Bilateral |
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Asymmetric Symmetry
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No equal halves.
Ex) sponge |
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Radial Symmetry
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Unlimited ways to divide into equal halves.
Ex) Sea anemone |
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Pentameral Symmetry
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Five ways to divide into equal halves.
Ex) Sea star |
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Bilateral Symmetry
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One way to divide into equal halves.
Ex) Puppy |
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What is "Functional Morphology"?
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The morphology of an organism is adapted to a particular life and feeding mode; must infer from living creatures what dead organisms might have done (how they lived, ate, etc.)
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Characteristics: Phylum Porifera
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Fresh marine waters
Cells but no real tissue Sessile (permanently attached; not free to move about) Epifaunally benthic Suspension feeders Lack organs Asymmetric (sometimes radial) Ex) Sponges |
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Phylum Cnidaria
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Mostly marine
Radial symmetry Sessile Epifaunally benthic Solitary or colonial Passive carnivores Tentacles w/ stinging cells Ex) jellyfish, sea anemone, coral |
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Phylum Bryozoa
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Mostly marine
Bilateral Sessile Epifaunally benthic Suspension feeder Colonial Ex) Moss animals |
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Phylum Brachiopoda
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Marine
Bilateral Sessile Epifaunally benthic Suspension feeder Solitary Lophophore for feeding Ex) Lamp shells |
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Phylum Mollusca (3) Classes
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1. Class Bivalvia
2. Class Gastropoda 3. Class Cephalopoda |
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Class Bivalvia
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Marine and freshwater
Bilateral or asymmetrical Mostly sessile Epi- and Infaunally benthic Suspension feeder Some bury themselves deep in sediment Ex) clams, oysters, scallops |
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Class Gastropoda
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Marine, freshwater, terrestrial
Asymmetrical Mobile Mostly epifaunal Mostly herbivores or carnivores Ex) snails, slugs |
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Class Cephalopoda
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Entirely marine
Bilateral Nektonic Extremely intelligent Typically carnivores Ex) squids, octopus |
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How are the symmetries of brachiopods and bivalves different?
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Bivalves have symmetry parallel to their opening.
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