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.

Ylodes simulans

Range & Status

Previously recorded in Wales and the River Forth.

Regional Distribution

A colony of larvae were recorded on the De Lank River, a tributary of the River Camel.

Larvae were recovered by the author in 1992 from a patch of Alternate Water-milfoil

Myriophyllum alterniflorum from which they appeared to have constructed their cases. Ylodes simulans was last recorded at the site in 2001. Since 2001 summer sampling has discontinued, therefore their subsequent absence from Environment Agency survey data cannot be regarded as an indicator that the species has been lost from the site.

Habitat & Ecology

Occurs in rivers amongst vegetation.


Pollution and changes to the flow regime (such as small weirs and dams).


Special recognition for host watercourses. The De Lank River is a SSSI and Special Area of Conservation.


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.