The Nonindigenous Occurrences section of the NAS species profiles has a new structure. The section is now dynamically updated from the NAS database to ensure that it contains the most current and accurate information. Occurrences are summarized in Table 1, alphabetically by state, with years of earliest and most recent observations, and the tally and names of drainages where the species was observed. The table contains hyperlinks to collections tables of specimens based on the states, years, and drainages selected. References to specimens that were not obtained through sighting reports and personal communications are found through the hyperlink in the Table 1 caption or through the individual specimens linked in the collections tables.

Siren intermedia
Siren intermedia
(Lesser Siren)
Native Transplant

Copyright Info
Siren intermedia Barnes, 1826

Common name: Lesser Siren

Taxonomy: available through www.itis.govITIS logo

Native Range: Atlantic and Gulf Coastal Plain from Virginia to Mexico, northward up the Mississippi River Basin to Illinois and Indiana (Conant and Collins 1991).

Hydrologic Unit Codes (HUCs) Explained
Interactive maps: Point Distribution Maps

Nonindigenous Occurrences:

Table 1. States with nonindigenous occurrences, the earliest and latest observations in each state, and the tally and names of HUCs with observations†. Names and dates are hyperlinked to their relevant specimen records. The list of references for all nonindigenous occurrences of Siren intermedia are found here.

StateFirst ObservedLast ObservedTotal HUCs with observations†HUCs with observations†
CA200820081San Francisco Bay

Table last updated 5/26/2024

† Populations may not be currently present.

Means of Introduction: May have come in via a plant shipment from Arkansas in 2005 (Micheletti 2010).

Status: Two adults and 40 larvae were removed when the pond was drained (Micheletti 2010).

Impact of Introduction: The impacts of this species are currently unknown, as no studies have been done to determine how it has affected ecosystems in the invaded range. The absence of data does not equate to lack of effects. It does, however, mean that research is required to evaluate effects before conclusions can be made.

Remarks: Also found several American bullfrogs in the pond. The taxonomy of sirens is under review.

References: (click for full references)

Conant, R.  and J.T. Collins. 1991. A Field Guide to Reptiles and Amphibians of Eastern and Central North America. Houghton Mifflin Co., Boston.

Micheletti, S. J. 2010. Siren intermedia (Lesser Siren),extralimital introduction/reproduction. Herpetological Review 41(4):470.

Revision Date: 6/29/2023

Citation Information:
U.S. Geological Survey, 2024, Siren intermedia Barnes, 1826: U.S. Geological Survey, Nonindigenous Aquatic Species Database, Gainesville, FL, https://nas.er.usgs.gov/queries/FactSheet.aspx?SpeciesID=2846, Revision Date: 6/29/2023, Access Date: 5/26/2024

This information is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The information has not received final approval by the U.S. Geological Survey (USGS) and is 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 information.


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. [2024]. Nonindigenous Aquatic Species Database. Gainesville, Florida. Accessed [5/26/2024].

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