Marsh Snail agg. - Stagnicola palustris/fuscus/corvus agg.

Length 20 to 25 mm. Three species Stagnicola palustris, S. fuscus and S. corvus have now been recognised that can only be separated by dissection so they are usually treated as an aggregate. They have  a thicker shell than other species in the genus, with striations running longitudinally across its length.

Lymnaea stagnalis is the other large 'conical' pond snail to be encountered but it can be distinguished by its sharper and more elongated spire and by its body whorl (the largest next to the mouth) being broader such that the outline is slightly concave. S. fuscus/palustris an almost straight edge profile.

Found in marshes and temporary pools that can dry up.

All year round.

Common in much of Britain except in Northern Scotland.

Uncommon or under-recorded in Leicestershire and Rutland.