Order Siphonophorida

Hydrozoa - Siphonophorida

Parent taxon: Hydrozoa according to J. J. Sepkoski 2002

Sister taxa: Actinulida, Chondrophorina, Delheidia, Eoporpita, Fistulella, Graptogeitonia, Hydrocorallinae, Hydroida, Jillua, Lemniscaterina, Likinia, Milleporidae, Milleporina, Ovatoscutum, Plumalina, Rhizostromella, Roseoporella, Sphaeractinida, Spongiomorphida, Spriggia, Stoliczkaria, Stoliczkiella, Stylasterina, Trachylinida, Tubulariae, Tubuloparietes

Subtaxa: Paropsonema Protolyella Rotadiscus Velellidae

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Ecology: nektonic carnivore-suspension feeder

Distribution:

• Eocene of Argentina (1 collection)

• Silurian of United States (2: New York)

• Cambrian of China (1)

Total: 4 collections each including a single occurrence

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