Scalaria frondicula sensu AA non S. Wood S.,1848
is
Epitonium linctum (De Boury & Monterosato, 1890) [Scalaria]
Scalaria frondicula was firstly introduced by S. Wood, in 1842
Ann. Mag. Nat. Hist. IX: 533 but this is a nomem nudum.
The name was validated
WOOD S.V., 1848 - A monograph of the Crag Mollusca with
descriptions of shells from the Upper Tertiaries of the British
Isles. 2. Bivalves. Paleont. Soc. Monogr. (London)
parte 1: pp. I-XII, 1-208, pl. 1-21 [1848]
All the best
Riccardo Giannuzzi-Savelli