PROTECTING WISCONSIN'S BIODIVERSITY

 
 
 
   
 
Scientific Name Common Name Global Rank State Rank Federal Status WI Status Animal Group

A Flat-headed Mayfly (Spinadis simplex)

 

 

 

 

 

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Counties with Mapped NHI Occurrences

Spinadis simplex (A Flat-headed Mayfly), a State Endangered species, prefers large, fast-flowing rivers where nymphs live among wood or other solid substrates over sand in deep water. The larvae have flattened bodies with broad heads and distinctive single platelike gills with tufts at the base. Nymphs are 6-9mm long and yellowish-brown with darker markings and with conspicuous filamentous gill tufts visible dorsally. Two bare tail filaments nearly as long as the length of head and body and the presence of spines or tubercles on the dorsal surface distinguishes this species from most other mayfly larvae. The small adult mayfly is 6-8mm long with a wingspan of 7.5-9.5mm.

 
 
 

Species of Greatest Conservation Need (SGCN) are associated with habitats (or natural communities) and places on the landscape. Understanding relationships among SGCN, natural communities and ecological landscapes help us make decisions about issues affecting SGCN and their habitat and how to respond. Download the Wildlife Action Plan association score spreadsheet to explore rare species, natural communities and ecological landscape associations

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 Wisconsin Wildlife Action Plan because lack of information can threaten our ability to successfully preserve and care for natural resources.