Caloneis Cleve (1894)

Caloneis was first introduced and described by Cleve in Cleve and Grove 1891 p.66 as a subgroup of Navicula.

Valves linear to broadly lanceolate sometimes centrally inflated or undulate. Ends cuneate, rounded, rostrate to sub-capitate. Axial area often broad and centrally inflated and slightly asymmetrical or "scruffy". Raphe +/- straight with ends hooked to one side. Striae visible and usually coarse, some species lacking striae in central area.

Round et al. (1990) argue that there is no basis for separating Caloneis from Pinnularia.

M.G. Kelly, H. Bennion, E.J. Cox, B. Goldsmith, J. Jamieson, S. Juggins D.G. Mann & R.J. Telford (2005). Common freshwater diatoms of Britain and Ireland: an interactive key. Environment Agency, Bristol.

Species described:-

Caloneis amphisbaena (Bory) Cleve
Caloneis limosa (Kützing) Patrick