invertebrates. jellies – phylum cnidaria round worms – phylum nematoda live in sediments or...
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Invertebrates
Jellies – Phylum Cnidaria
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
Peanut Worms – Phylum Sipuncula
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
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 Mollusca
Phylum MolluscaA.A. Body StructureBody Structure
Phylum Mollusca• RadulaRadula
Phylum Mollusca• ReproductionReproduction
Trocophore Trocophore VeligerVeliger
Phylum Mollusca1.1. GastropodsGastropods
Phylum Mollusca1.1. GastropodsGastropods
Nudibranchs withsymbiotic algae
Petropods
Phylum Mollusca2.2. BivalvesBivalves• Laterally compressed• Two-valved shell• No head or radula• Gills used for suspension feeding (active) & respiration
• Water enters and leaves through siphons
• Some anchor to substrate with byssal threads