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A Mayfly - Caenis youngi
Native Species
Global Rank:
G5
State Rank:
S4
(see State Rank Reason below)
Agency Status
USFWS:
USFS:
BLM:
External Links
State Rank Reason (see State Rank above)
This species was added to the Species of Concern list as an S2 in 1987 for “undocumented reasons” (MNHP 2015). However, more recent macroinvertebrate surveys across various regions of the state have greatly increased the number of occurrences to 29, and it is now considered to be less habitat-restricted and present state-wide (MNHP 2015). In light of this, MNHP has removed it from the SOC list.
General Description
This mayfly species has been reported from slow-moving vegetated streams, sloughs or wetlands across Montana. The larvae are small and brown with protective opercules over their gills to protect them from silt and sediment.
Diagnostic Characteristics
The larvae are small and brown with protective opercules over their gills to protect them from silt and sediment.
Species Range
Montana Range
Range Descriptions
Native
Range Comments
Locations and habitat presented in the original species description indicated that this species was limited to slow moving waters in the Yellowstone Park area of Montana (Roemhild 1984). However, more recent macroinvertebrate surveys across various regions of the state have greatly increased the number of occurrences to 29, and it is now considered to be less habitat-restricted with a statewide range extent (MNHP 2015).
Observations in Montana Natural Heritage Program Database
Number of Observations: 38
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Map Help and Descriptions
Relative Density
Recency
(Observations spanning multiple months or years are excluded from time charts)
Migration
This species is not known to migrate as adults and the larvae are fairly sedentary.
Habitat
This mayfly species has been reported from slow-moving vegetated streams, sloughs or wetlands across Montana.
Stewardship Responsibility
References
- Literature Cited AboveLegend:
View Online Publication
Roemhild, G. 1984. A new species of Caenis (Ephemeroptera: Caenidae) from Montana, U.S.A. Aquatic Insects 6(1): 7-11.
- Additional ReferencesLegend: View Online Publication
Do you know of a citation we're missing?- Hendricks, P., S. Lenard, D.M. Stagliano, and B.A. Maxell. 2013. Baseline nongame wildlife surveys on the Fort Peck Indian Reservation. Report to the Assiniboine and Sioux Tribes of the Fort Peck Indian Reservation. Montana Natural Heritage Program, Helena, MT. 83 p.
- Provonsha, A. V. 1990. A Revision of the Genus...
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- Additional Sources of Information Related to "Insects"
