Semaeostomeae
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The order consists of five families.
- Family Cyaneidae
- Family Drymonematidae
- Family Pelagiidae
- Family Phacellophoridae
- Family Ulmaridae
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Differentiation
The three traditional families, Pelagiidae, Cyaneidae, and Ulmaridae, are distinguishable by these characteristics:
- Gastrovascular cavity divided by radial septa into rhopalar and tentacular pouches
- Pouches simple and unbranched – Pelagiidae
- Pouches branched – Cyaneidae
- Gastrovascular system in form of unbranched and branching canals, or with anastomosing radial canals – Ulmaridae
In addition, members of the Pelagiidae have no ring canal, and the marginal tentacles arise from umbrella margin. Three genera are in this family.
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Monotypic taxonTaxonomic group with only one subordinate taxonSpecies descriptionFormal description of a discovered speciesParaphylyType of taxonomic groupIUCN Red ListInventory of the global conservation status of biological speciesSubtropicsGeographic and climate zoneCommon nameName generally used for a taxon, group of taxa or organism(s)