Cornish Biodiversity Network  -  Supporting Wildlife Recording

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Cornish Red Data (2009)

The descriptive text, below the map, is from the Cornish Red Data Book (2009). The map on this web page depicts the organisms distribution and shows the records made pre-2000 and those made since.

Glossosoma intermedium

Range & Status

Rare; the only recent records are from two small streams in the English Lake District.

Regional Distribution

There is a single record for Cornwall (in 1971). This is almost certainly a misidentification of one of the other two common Glossosoma species as the key then available to larvae led to many such errors occurring.

Habitat & Ecology

Occurs in streams, in fine silt, sand, gravel and small pebble substratum.


Not known.


Special recognition for host watercourses.


I.J. Bennallick, S. Board, C.N. French, P.A. Gainey, C. Neil, R. Parslow, A. Spalding and P.E. Tompsett. eds. 2009. Red Data Book for Cornwall and the Isles of Scilly. 2nd Edition.Croceago Press.

The Cornish Red Data Book Project was led by the Cornwall and Isles of Scilly Federation for Biological Recorders (CISFBR). The full text and species accounts (minus the maps) are available on the CISFBR website.

Cornish Biodiversity Network. 2017.