'Phylum rotifera' presentation slideshows

An Introduction to Invertebrates

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PSEUDOCOELOMATE PHYLA

PSEUDOCOELOMATE PHYLA. CHARACTERISTICS. Pseudocoelom space between gut and mesoderm parts of body wall space filled with fluid for differentiation of systems storage of waste products used as hydrostatic skeleton. CHARACTERISTICS. Cuticle acellular outer covering, over epidermis

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Platyhelminthes: flatworms

Platyhelminthes: flatworms. Cestoda: tapeworms Turbellaria: free living flatworms like Planaria Trematoda: flukes like Schistosoma. Platyhelminthes. Have bilateral symmetry Can be free living or parasitic Have 3 germ layers and are acoelmate (lacking a cavity between gut and outer wall)

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The Lesser Protostomes

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Phylum Rotifera

Phylum Rotifera. > 1,800 described species < 1 mm Complex, variety of body forms Solitary Pseudocoelomate Generally freshwater. Rotifer body. Head, trunk, foot Ciliary organ on anterior end = corona Complete gut Protonephridia Tendency to constant cell number

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PSEUDOCOELOMATES

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PSEUDOCOELOMATES

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PSEUDOCOELOMATES

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9 /13`/2011

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PSEUDOCOELOMATES

PSEUDOCOELOMATES. PHYLUM NEMATODA PHYLUM ROTIFERA. PHYLUM NEMATODA. Phylum Nematoda: cs through esophagus, note pseudocoel & thick cuticle [fig 5.4]. Phylum Nematoda: Cross-section through female (A) & male (B) nematode worm.

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