Phylum Ctenophore - Maclay School

Phylum Ctenophore - Maclay School

Phylum Ctenophore The comb jellies Less than 100 species Radial symmetry 8 rows of ciliary

combs, that beat in waves Marine Worms October 31st, 2014 Phylum

Platyhelminthes Flatworm Flatworms -20,000 species -flattened

-bilaterally symmetry -central nervous system with simple brain -organ and organ system -some free-living -some parasiticlive in

or on other organisms and harm them (flukes and tapeworms) planari a

Flatworms Flatworms Flatworms

Internal parasite Flatworms scole

tapewor ms Worm body Phylum Nemertea

Ribbon worms Look like long flatworms but more complex Complete digestive tract Circulatory system Proboscis long fleshy tube used to

entangle prey. 900 species-mostly marine. In all oceans, mostly shallow temperate waters Ribbon worms

Phylum Nematoda Rarely seen-25,000 sp. Some parasitic, some not Small, cylindrical

bodies, pointed at both ends Live in sediments, eat bacteria Roundworms

Phylum Annelida Phylum Annelida Segmented worms Phylum Annelida

Examples: polychaete worms, earthworm Bilateral symmetry Advanced marine worms Closed circulatory system Organ organization

Larger ones have gills More advanced muscles system Segmented bodies Often live in tubes of mucus, protein, seaweed, mud, sand, shells

20,000 species Symmetry Bilater al Radi

al Segmented worms Annelid a

Segments: a series of compartments Parapodia: each segment has flattened extensions Setea: stiff hair-like

projections. Project from parapodia and are connected to internal muslces. Allow for contractions and movement.

Annelid a Annelid a

Annelid a Annelid a Annelid

a

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