Bio 160 Lab Exam 2

1. Segmented worms2. True coelem, complete digestive tract, usually closed circulatory system3. Nephridia for excretion4. Well-developed muscles5. Either dioecious or hermaphroditic

Phylum: Annelida, Class Polychaeta, Genus: ArenicolaCommon Name: Lugworm

Polychaeta ("many long hairs"Many setae (bristles), usually protruding in bundles. Pronounced differentiation of some body segments, well-differentiated head with sensory appendages.Parapodia (lateral fleshy extensions) on most segments. Used for primitive gills or respiratory organs, anchors while in tubes, crawling, and swimming.

Phylum: Annelida, Class: Polychaeta, Genus: Nereis. Common name: Clamworm

Hirudinea ("characterized by being a leech"1. No setae or parapodia2. Many transverse grooves, creating appearance of more segments than it actually has.3. Well-developed midgut with ceca (blind-ended pouches). Ceca allow for storage of food so the leech may be able to go months without eating.4. Have suckers.

Phylum: Annelida, Class: Hirudinea, Genus: HaemopisPredatory, eats other leeches, oligochaetes, and snails.

Phylum: Annelida, Class: Hirudinea, Phylum: Macrobdella, Species: Macrobdella decoraCommon name: Medical leechParasitic, feeds primarily on frog blood.

Phylum: Annelida, Class: Hirudinea, Genus: TheromyzonFound in the nasal cavities of water birds like ducks and American coots. Blood sucker.

Oligochaeta ("few long hairs")Includes earthworms
1. Segmented worms with few setae and a clitellum.2. No compound eyes, mouth parts, or appendages.3. Cutaneous respiration.

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Phylum: TardigradaCommon name: Water bearsInteresting fact: can survive up to 10 days in vacuum of space while dormant.

Phylum: Ectoprocta (outside anus)