AnimalsJellyfish & KinHydras & Jellyfish — Class Hydrozoa
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Hydromedusa —  Nemopsis bachei [1]
Order Anthoathecatae. Family Bougainvilliidae.
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Hydras — Family Hydridae
Order Anthoathecatae.
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Freshwater Hydroid —  Cordylophora caspia [2]
Order Anthoathecatae. Family Oceanidae.
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By-the-wind Sailor —  Velella velella [1]
Order Anthoathecatae. Family Porpitidae.
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Many-ribbed Jellyfish —  Rhacostoma atlanticum [1]
Order Leptothecatae. Family Aequoreidae.
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Freshwater Jellyfish —  Craspedacusta sowerbyi [2]
Order Limnomedusae. Family Olindiidae.
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Portuguese Man o' War —  Physalia physalis [1]
Order Siphonophorae. Family Physaliidae.
Evidence that species is found in Texas:
  1. Identification Guide to Marine Organisms of Texas, Texas A&M University, Galveston Campus.
  2. The Aquatic Invertebrates of Texas, Stephen W. Ziser, Austin Community College, Department of Biology, 2011.