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Rich Staffen
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608-266-4340

Extra-striped Snaketail (Ophiogomphus anomalus)

Need a main photo for this animal


Overview

Overview

Extra-striped snaketail (Ophiogomphus anomalus), a dragonfly listed as a Federal Species of Concern and 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
WWAP SGCN

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.

Photos/Video

Photos


Extra-striped Snaketail

Female Extra-striped Snaketail.

Photo © Dennis Paulson.


Last revised: Thursday, May 04, 2017