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xxTerwin: Animal Diversity (Worms, Leeches, Crustaceans, Insects)

Terms

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Phylum Annelida

Segmented worms.
Specialized digestive & excretory system.
Septa
In segmented worms, separate body segments.
Setae

Hair-like or hook-like extensions made of chitin.
Annelid classes

Class Oligochaeta.
Class Polychaeta.
Class Hirudinea.
Class Oligochaeta

Earthworms.
Class Polychaeta

Marine worms.
Most have complex segmentation, with parapodia & elaborate setea.
Class Hirudinea

Leeches.
Mostly freshwater & terrestrial.
Parasites that connect & extract blood with hirudin.
Once common in medical treatment, still sometimes used.
Hirudin
Anti-coagulate used to extract blood.
Phylum Arthropoda
Crabs, insects, spiders, centipedes, lobsters.

Nearly 1 Million species!
Phylum Arthropoda Anatomy
Segmentation: head, thorax, abdomen.
Exoskeleton: protects & provides sites for muscle attachment.
Jointed appendages: specialized for variety of uses.
Arachnida
Spider, scorpions, ticks, horeshoe crabs.
Book lungs.
Chelicerates
In Arachnida, fang-like chelicerae are modified appendages.
Insecta
Have many complex organ systems
Crustacea
Crabs, lobsters, shrimp, krill.
Phylum Echinodermata
Sea stars (asteroidea); brittle stars (ophiuridae); sea cucumbers, sea urchins.
Approx 7,000 species, all marine.
Phylum Echinodermata Anatomy
Radial symmetry .
Water vascular system with tube feet.

Some able to regenerate lost appendages.

Deck Info

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