Cnidnarians

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Cnidnarians

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Cnidarians are mostly made up of mesoglea, a jelly-like substance located between their "outer" and "inner" layers. They have a sac-like body plan with only one opening that serves as both the mouth and anus, so they do not have a complete gut. Cnidarians can be found in both fresh and saltwater habitats and typically use specialized stinging cells called cnidocytes to capture prey rather than cilia. They alternate between a polyp and medusa form during their life cycle, but their larvae are generally diploid rather than haploid.