Obelia dichotoma
(sea thread hydroid)
Coelenterates-Hydrozoans
Exotic
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9 results for Obelia dichotoma (sea thread hydroid)
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Specimen IDStateCountyLocalityYear HUC Number What's this? Drainage nameStatus
1838 CA San Francisco Bay1894 18050004 San Francisco Bayestablished
272458 CAHumboldtCoast Guard "Ready Dock", Humboldt Bay.2001 18010102 Mad-Redwoodestablished
1886046 DESussexIndian River Marina, Indian River Bay2023 02040303 Chincoteague 
162573 HIHonoluluKoko Marina nearshore, approx. 250m from bridge and main channel to Hawaii Kai marinas, Oahu2002 20060000 Oahuestablished
162685 HIHonoluluMaunalua Bay, Oahu2002 20060000 Oahuestablished
1871 HIHonoluluPearl Harbor1975 32515200 Hawaiiestablished
1872 HIHonoluluPearl Harbor1978 32515200 Hawaiiestablished
1886048 NJCape MayBlue Water Marina, Crook Horn Creek2023 02040302 Great Egg Harbor 
1886047 NJCape MayBree-Zee-Lee Marina, Cape May Harbor2023 02040302 Great Egg Harbor 

Data Disclaimer: Number of records does not imply species abundance. This summary represent collection records only and may not reflect the actual distribution of established populations. These data are preliminary or provisional and are subject to revision. They are being provided to meet the need for timely best science. The data have not received final approval by the U.S. Geological Survey (USGS) and are provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the data.

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The data represented on this site vary in accuracy, scale, completeness, extent of coverage and origin. It is the user's responsibility to use these data consistent with their intended purpose and within stated limitations. We highly recommend reviewing metadata files prior to interpreting these data.

Citation information: U.S. Geological Survey. [2025]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [12/5/2025].

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For general information and questions about the database, contact Wesley Daniel. For problems and technical issues, contact Matthew Neilson.