Phylum Nematoda

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18 Terms

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Kingdom

Animalia

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Phylum Nematoda

roundworms

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Embryonic germ layers

Triploblastic (ectoderm, mesoderm, endoderm)

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Cephalization

Present

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Adult symmetry

Bilateral

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Body cavity

pseudocoelom

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Respiratory structures

diffusion

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Digestive system

complete

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Skeletal structure

Hydrostatic and cuticule

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circulatory system

absent

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body segmentation

absent

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nervous system

nerve ring

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Reproduction

Dioecious

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Protostomes

blastopore becomes mouth

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Pseudocoelomates

the pseudocoel is a fluid-filled body cavity not fully lined by mesoderm

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Spiral cleavage

Cleavage is variable in nematodes and not clearly spiral

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Mosaic Embryo

Mosaic (determinate) development

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Metamerism

no segmentation