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Kingdom
Animalia
Phylum Nematoda
roundworms
Embryonic germ layers
Triploblastic (ectoderm, mesoderm, endoderm)
Cephalization
Present
Adult symmetry
Bilateral
Body cavity
pseudocoelom
Respiratory structures
diffusion
Digestive system
complete
Skeletal structure
Hydrostatic and cuticule
circulatory system
absent
body segmentation
absent
nervous system
nerve ring
Reproduction
Dioecious
Protostomes
blastopore becomes mouth
Pseudocoelomates
the pseudocoel is a fluid-filled body cavity not fully lined by mesoderm
Spiral cleavage
Cleavage is variable in nematodes and not clearly spiral
Mosaic Embryo
Mosaic (determinate) development
Metamerism
no segmentation