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16 Cards in this Set
- Front
- Back
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Phylum Annelida
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Segmented worms.
Specialized digestive & excretory system. |
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Septa
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In segmented worms, separate body segments.
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Setae
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Hair-like or hook-like extensions made of chitin.
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Annelid classes
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Class Oligochaeta.
Class Polychaeta. Class Hirudinea. |
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Class Oligochaeta
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Earthworms.
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Class Polychaeta
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Marine worms.
Most have complex segmentation, with parapodia & elaborate setea. |
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Class Hirudinea
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Leeches.
Mostly freshwater & terrestrial. Parasites that connect & extract blood with hirudin. Once common in medical treatment, still sometimes used. |
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Hirudin
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Anti-coagulate used to extract blood.
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Phylum Arthropoda
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Crabs, insects, spiders, centipedes, lobsters.
Nearly 1 Million species! |
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Phylum Arthropoda Anatomy
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Segmentation: head, thorax, abdomen.
Exoskeleton: protects & provides sites for muscle attachment. Jointed appendages: specialized for variety of uses. |
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Arachnida
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Spider, scorpions, ticks, horeshoe crabs.
Book lungs. |
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Chelicerates
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In Arachnida, fang-like chelicerae are modified appendages.
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Insecta
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Have many complex organ systems
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Crustacea
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Crabs, lobsters, shrimp, krill.
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Phylum Echinodermata
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Sea stars (asteroidea); brittle stars (ophiuridae); sea cucumbers, sea urchins.
Approx 7,000 species, all marine. |
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Phylum Echinodermata Anatomy
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Radial symmetry .
Water vascular system with tube feet. Some able to regenerate lost appendages. |
