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Type form from „Ridicofano“ = San Vito: Anterior upper palatal plica mostly present.
Form from remaining species range: Anterior upper palatal plica mostly missing.
n. episoma Brandt 1961, coast near S. Vito: Shell smaller; whorls more distinctly ribstriated; anterior upper palatal plica
missing.
S. spezialensis H. Nordsieck 1984
Diagnosis: Shell decollated; with welldeveloped white surface layer; whorls ribbed or weakly ribstriated, with sutural
papillae; dorsal keel missing; inferior lamella mostly high; anterior upper palatal plica missing, basalis missing, posterior
lower palatal plica connected with lunella; clausilium plate fit in the frame of lunella and posterior lower palatal plica;
palatal edge distally not bent up.
Distribution: San Vito peninsula from Macari and Castelluzzo to Monte Acci and Monte Speziale.
Geographic forms:
Type form is ribbed.
Form from remaining species range: Whorls weakly ribstriated.
S. eminens (A. Schmidt 1868)
Diagnosis: Shell decollated; whorls ribbed; dorsal keel indistinct or missing; inferior lamella mostly high; anterior upper
palatal plica present, mostly separated from upper palatal plica, basalis tending to be shortened; palatal edge of
clausilium plate distally not receding, palatal edge distally somewhat or not bent up.
Distribution: From Custonaci in the west to Castellammare in the east, environs of Calatafimi, M. Bonifato near Alcamo.
S. crassicostata (L. Pfeiffer 1856)
Fig. 6
Diagnosis: Shell decollated; whorls ribbed, in part percostate; dorsal keel distinct or indistinct; inferior lamella
moderately high or high; anterior upper palatal plica present, separated from upper palatal plica, in part missing, basalis
tending to be shortened; palatal edge of clausilium plate distally not receding, palatal edge distally somewhat or not
bent up.
Distribution:: Monte Cofano, (probably introduced on) island of Favignana.
Geographic forms:
Type form is percostate.
Form from near Monte Cofano and part of Monte Cofano: Whorls not percostate = normally ribbed.
S. nobiliscalcarae group, no subgroup
S. ferrox Brandt 1961
Diagnosis: Shell mostly not decollated; whorls ribbed, sutural papillae recognizable; dorsal keel distinct or indistinct;
inferior lamella moderately high or high; two anterior upper palatal plicae present, upper one mostly separated from
upper palatal plica; palatal edge of clausilium plate distally less or not receding, palatal edge distally not bent up.
Distribution: From Altavilla Milicia to Termini Imerese.
Synonyms: C. confinata var. commeata Westerlund 1892 could be an older synonym, but the description is too poor
(lower anterior upper palatal plica not mentioned) and types are not available (Reitano et al. 2007: 328).
