Ch. 32 Bio

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Hirudo medicinalis is used to reduce what?

fluid pressure and prevent blood clotting in damaged tissues
Hirudinea (leeches) characteristics?
- · Terrestrial or freshwater (most)
- · No parapodia, setae or tentacles
- · Have anterior and posterior suckers
- · Secretes anticoagulant and anesthetic monoecious
Oligochaeta characteristics?
- · Freshwater and terrestrial (rarely marine)
- · Poorly developed head
- · No parapodia or tentacles; reduced setae
- · Burrows in and ingests soil
- · Monoecious
Polychaeta (polychaetes) characteristics?
- · Mostly marine; live in tubes, crawl on, or burrow in seafloor
- · Most have one or more pairs of tentacles
- · Mostly dioecious
- · Most segments have a pair of fleshy parapodia (parapodia function in gas exchange and locomotion; have stiff bristles called setae)
What are three classes of annelids?
- Polychaeta (polychaetes)
- Oligochaeta
- Hirudinea (leeches)
Annelida (segmented worms) characteristics?
- · Coelomate
- · Segmented body
- · Digestive tract (most)
- · Closed circulatory system (most)
Brahciopoda (brachiopods) characteristics?
- · Coelomate
- · Have lophophore
- · Hinged dorso-ventral shell
- · Sessile
- · Marine
Phoronida (phoronids) characteristics?
- · Coelomate
- · Lophophorate
- · U-shaped digestive tract
- · Live inside chitin tubes they secrete
- · Sessile Marine
Nemertea (ribbon worms) characteristics?
- · Coelomate
- · Complete digestive tract
- · Unique retractable proboscis; housed in rhynchocoel
- · Marine (most)
Rotifera (rotifers) characteristics?
- · Pseudocoelomate
- · Head with crown of cilia (corona)
- · Complete digestive tract
- · Freshwater (most)
- · Dioecious (most); some parthenogenic
Cestoda (tapeworms) characteristics?
- · Parasites of vertebrates
- · Head (scolex) has hooks and suckers
- · Body composed of successive proglottidsMonoecious
Trematoda (flukes) characteristics?
- · Parasites of mollusks and vertebrates
- · Inhabit digestive tract and/ or liver
- · Complex life cycles with intermediate hostsMonoecious (most); some dioecious
Examples of Trematoda (flukes) are?
- Fasciola hepatica (liver fluke)
- schistosoma mansoni (blood fluke)
Turbellaria (turbellarians) flatworm characteristics?
- · Free-living carnivores
- · Marine (most) or freshwater
- · Move via cilia or undulation
- · Have ocelli (eyespots)
- · Monoecious (One individual can produce both egg and sperm)
The three classes of flatworms are?
- Turbellaria (turbellarians)
- Trematoda (flukes)
- Cestoda (tapeworms)
Phylum Platyhelminthes (flatworms) characteristics?
- · Acoelomate
- · Unsegmented
- · Dorsoventrally flattened body
- · Gastrovascular cavity or no digestive tractSome free-living; most parasitic
Phylum Ectoprota (bryozoans) characteristics?
- · Coelomate
- · Have lophophore
- · Marine (most)
- · Colonial
- · Reproduce sexually and asexually
What are the phylum's of lophotrochozoans?
- Phylum Ectoprota (bryozoans)
- Phylum Platyhelminthes (flatworms)
- Rotifera (rotifers)
- Nemertea (ribbon worms)
- Phoronida (phoronids)
- Brahciopoda (brachiopods)
- Annelida (segmented worms)
- Mollusks
Ecdoysozoans?

have an exoskeleton (chitin) or a cuticle; must undergo ecdysis to grow.
Lophotrochozoans?

possess a lophophore or have a tropchophore larval stage.
What are the two major protostomes clades?

Lophotrochozoans and Ecdoysozoans
Protostomes?
- · Triploblastic (ectoderm, mesoderm and endoderm)
- · Bilateral symmetry
- · Anterior brain
- · Ventral nervous system with paired or fused longitudinal nerves
- · Embryonic blastopore becomes mouth (most)Exhibit spiral cleavage (most)

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Ch. 32 Bio

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Ch. 32 Bio

Updated

2010-11-24T22:38:47Z

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