Share your observations

Share your observations of plants or non-game animals with the Natural Heritage Inventory

Rare animals
Find rare and non-game animals.
Rare plants
Learn about plants on the Natural Heritage Working List.
Rare lichens
Discover Wisconsin's lichens.
Natural communities
Explore Wisconsin's natural communities.
Other features
Discover unique resources.
Eagle license plate

Help care for rare plants and animals by ordering an Endangered Resources plate.

Contact information
For information on Wisconsin's rare vertebrate animals, contact:
Rich Staffen
Conservation Biologist
For information on Wisconsin's rare invertebrates, contact:
Jay Watson
Conservation Biologist

Extra-striped Snaketail (Ophiogomphus anomalus)



Extra-striped Snaketail (Ophiogomphus anomalus), listed as Endangered in Wisconsin, has been found in medium to large clean, warm streams. The flight period extends from late May through late June.

State status

Status and Natural Heritage Inventory documented occurrences in Wisconsin

The table below provides information about the protected status - both state and federal - and the rank (S and G Ranks) for Extra-striped Snaketail (Ophiogomphus anomalus). See the Working List Key for more information about abbreviations. Counties shaded blue have documented occurrences for this species in the Wisconsin Natural Heritage Inventory database. The map is provided as a general reference of where occurrences of this species meet NHI data standards and is not meant as a comprehensive map of all observations.

Note: Species recently added to the NHI Working List may temporarily have blank occurrence maps.

Documented locations of Ophiogomphus anomalus in the Natural Heritage Inventory Database as of July 2015.
Summary Information
State StatusEND
Federal Status in Wisconsinnone
State RankS2S3
Global RankG4
Tracked by NHIY

Species guidance

Note: a species guidance document is not available at this time. Information below was compiled from publication PUB-ER-085-99 (now out-of-print).

Identification: O. anomalus adults are about 1.5 to 1.7 inches (39-44 mm) long, with the abdomen being 28-33 mm and the hind wing being 24-27 mm long. The occiput (top part of the head) is green with black on the outermost angles that continues on a black ridge behind the green eyes. The face is also green with full length black cross stripes on the frontal and lateral sutures (looks like two mustaches). The female has two pairs of minute nipple-shaped, black horns on head. The thorax is bright green, heavily striped with black. The abdomen is mainly black with wide pale yellow bands on the base that reduce to rows of spots on middle segments. The end of the abdomen bears two dorsal appendages and one ventral appendage that are distinctive in shape.

Habitat: Prefers fast-flowing, medium-sized, warm water streams (100 to 800 ft. wide) with abundant gravel and excellent water quality in heavily forested watersheds.

State Distribution: Occurs in the upper Chippewa River basin in the Chippewa, Flambeau, South Fork Flambeau, Elk, and Jump Rivers; in the Saint Croix River in Burnett County; and from the Peshtigo River in Forest County.

Phenology: Adults are seldom seen even at sites where larvae or exuviae are common and apparently forage above the forest canopy. They are sometimes found around streamside bushes.

Management Guidelines: See the Ophiogomphus discussion section.



Extra-striped Snaketail

Female Extra-striped Snaketail.

Photo © Dennis Paulson.

Wildlife Action Plan

Wisconsin Wildlife Action Plan graphic

Natural community (habitat) associations

The table below lists the natural communities that are associated with Extra-striped Snaketail. Only natural communities for which Extra-striped Snaketail is "high" (score=3) or "moderate" (score=2) associated are shown. See the key to association scores for complete definitions. Please see the Wildlife Action Plan to learn how this information was developed.

Natural community Score
Warmwater rivers 3
Warmwater streams 2

Ecological landscape associations

The table below lists the ecological landscape association scores for Extra-striped Snaketail. The scores correspond to the map (3=High, 2=Moderate, 1=Low, 0=None). For more information, please see the Wildlife Action Plan.

This map shows the probability of Extra-striped Snaketail occurring in each of Wisconsin's Ecological Landscapes.  Actual scores can be found in the table to the left.

Back to Top

Landscape-Community combinations of highest ecological priority*

Ecological priorities are the combinations of natural communities and ecological landscapes that provide Wisconsin's best opportunities to conserve important habitats for a given Species of Greatest Conservation Need. The 10 highest scoring combinations are considered ecological priorities and are listed below. More than 10 combinations are listed if multiple combinations tied for 10th place. For more information, please see the Wildlife Action Plan.

* Ecological priority score is a relative measure that is not meant for comparison between species. This score does not consider socio-economical factors that may dictate protection and/or management priorities differently than those determined solely by ecological analysis. Further, a low ecological priority score does not imply that management or preservation should not occur on a site if there are important reasons for doing so locally.

Back to Top

Issues/threats and conservation actions

Conservation actions respond to issues or threats, which adversely affect species of greatest conservation need (SGCN) or their habitats. Besides actions such as restoring wetlands or planting resilient tree species in northern communities, research, surveys and monitoring are also among conservation actions described in the WWAP because lack of information can threaten our ability to successfully preserve and care for natural resources.

Threats/issues and conservations actions for rare animals

Back to Top

Last revised: Thursday, October 08, 2020