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Comparison Of Phylum Cnidaria And Jellyfishes

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Crayfishes are part of the subphylum Crustacea, and are part of the Phylum Arthropoda. Phylum Arthropoda have a bilateral body symmetry which means the body is divided into similar external right and left halves. The tissue organization of Phylum Arthropoda have three tissue layers, ectoderm, endoderm, and mesoderm; thus it is triploblastic. The body cavity of the phylum is coelomate meaning its organs are lined with mesoderm. Phylum Arthropoda embryonic development is protostome which means that the blastopore develops into the mouth first. Crustacea have compound eyes; thus, allowing to see images. They also have exoskeletons that are reinforced with calcium carbonate. Crayfishes have swimmerets which are appendages that are used for swimming and reproduction. …show more content…

Jellyfishes have a radial body symmetry; therefore, the body is arranged in a central axis. Jellyfishes are diploblastic, they have only two tissue layers, ectoderm and endoderm. Phylum Cnidaria are acoelomate, lacking a body cavity. Because Phylum Cnidaria are acoelomate, embryonic development does not apply to the phylum. Phylum Cnidaria name derives from cnidocytes which are special stinging cells that are used to trap its prey. Phylum Cnidaria have two body forms known as polyps, sessile or free-living, and medusas, free-swimming. Phylum Cnidaria also have no vascular system; thus, the gastrovascular cavity reaches all parts of the

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