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Round Worms – Phylum Nematoda
• Live in sediments or tissues of other organismsLive in sediments or tissues of other organisms
• Over 12,000 described species (may be 500,000)Over 12,000 described species (may be 500,000)
• Very abundant (hundreds per mL of sediment)Very abundant (hundreds per mL of sediment)
• Hydrostatic skeletonHydrostatic skeleton
Peanut Worms – Phylum Sipuncula
• Unsegmented marine wormsUnsegmented marine worms
• Borrow in mud, corals or empty shellsBorrow in mud, corals or empty shells
• Deposit feedersDeposit feeders
Spoon Worms – Phylum Echiura
• Exclusively marine, unsegmentedExclusively marine, unsegmented
• Non-retractable probiscisNon-retractable probiscis
Segmented Worms – Phylum Annelida• Segmented worms• Gut - coelom• Hydrostatic skeleton
• Longitudinal and radial muscles• Efficient locomotion and burrowing
• More than 15,000 species• Cosmopolitan
Segmented Worms – Phylum Annelida1. Class PolychaetaClass Polychaeta
• Diverse lifestyles• Free-living predators
• Often well-developed eyes and sense organs, jaws
Segmented Worms – Phylum Annelida1. Class PolychaetaClass Polychaeta
• Diverse lifestyles• Burrowing deposit feeders• Burrowing suspension feeders
Segmented Worms – Phylum Annelida1. Class PolychaetaClass Polychaeta
• Diverse lifestyles• Burrowing deposit feeders• Burrowing suspension feeders
Phylum Mollusca1.1. GastropodsGastropods
Nudibranchs withsymbiotic algae
Petropods