Scyphozoa
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The Scyphozoa are an exclusively marine class of the phylum Cnidaria, referred to as the true jellyfish.
Fossilized stranded scyphozoans on a Cambrian tidal flat at Blackberry Hill, Wisconsin.
The developmental stages of scyphozoan jellyfish's life cycle: 1–3 Larva searches for site 4–8 Polyp grows 9–11 Polyp strobilates 12–14 Medusa grows
Hydrozoa
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Hydrozoa, also called hydroids are a taxonomic class of individually very small, predatory animals, some solitary and some colonial, most of which inhabit saline water. The colonies of the colonial sp
The hydroid Tubularia indivisa, fertile
The highly apomorphic Siphonophorae—like this Portuguese man o' war (Physalia physalis)—have long misled hydrozoan researchers.
Limnomedusae like the flower hat jelly (Olindias formosa) were long allied with Anthomedusae and Leptomedusae in the "Hydroida".