Isotoma anglicana


Isotoma caerulea/viridis and Isotoma anglicana are very similar and can only be reliably separated (using slide-mounted specimens) by examining the manubrial 'teeth' and setae on the dens. Isotoma viridis has a single pair of 'teeth' on the thickened apical edge of the manubrium, whereas Isotoma anglicana/caerulea have two pairs of manubrial teeth. I. caerulea has 2 basal dorsal setae on the dens, I. anglicana has 3. 

Similar Species

Isotoma caerulea, Isotoma viridis. 

Identification difficulty
Recording advice

Confirmation requires microscopic proof of presence of two pairs of manubrial teeth and correct confirmation of manubrial setae. 


Damp places.

When to see it

All year round.

UK Status

Widespread and fairly frequent in Britain.

VC55 Status

Status in Leicestershire and Rutland not known.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map