Joculator semiperlucidus A. Cecalupo & I. Perugia,2013
Horologica semipicta (A.A. Gould, 1861)
Tubercliopsis septapilia (C.F. Laseron, 1951)
Synthopsis serenae A. Cecalupo & I. Perugia,2012
Cerithiopsis serina W.H. Dall, 1927
Horologica siapoi Cecalupo & Perugia, 2017
Horologica siazei Cecalupo & Perugia, 2017
Seila sienii Cecalupo & Perugia, 2017
Cerithiopsina signa (P. Bartsch, 1921)
Synthopsis silviae A. Cecalupo & I. Perugia,2012
Seila silviae A. Cecalupo & I. Perugia,2012
Synthopsis similior A. Cecalupo & I. Perugia,2013
Joculator simulans A. Cecalupo & I. Perugia,2012
Cerithiopsis simulator (FOSSIL) (C.R. Laws, 1939 †)
Cerithiopsis singularis E. Rolán& R. Fernández-Garcés, 2013
Prolixodens sknips M. Jay & J. Drivas, 2002
Joculator skolix M. Jay & J. Drivas, 2002
Seila societatis A. Cecalupo & I. Perugia,2014
Cerithiopsis sohli (FOSSIL) Kauffman, 1961 †
Cerithiopsis sorex P.P. Carpenter, 1857
Cerithiopsis soror K.H.J. Thiele, 1925
Synthopsis spadai Cecalupo & Perugia, 2017
Synthopsis spectabilis A. Cecalupo & I. Perugia,2012
Zaclys spiculum (FOSSIL) C.R. Laws, 1940 †
Marshallopsis spinosa A. Cecalupo & I. Perugia,2013
Mendax spiritussanctis A. Cecalupo & I. Perugia,2013
Prolixodens splendens A. Cecalupo & I. Perugia,2012
Horologica splendida A. Cecalupo & I. Perugia,2012
Cerithiopsis spongicola T. Habe, 1960
Sundaya spurca Cecalupo & Perugia, 2017
Cerithiopsis stejnegeri W.H. Dall, 1884
Seila stenopyrgisca (FOSSIL) Darragh, 2017 †
Cerithiopsis stephensae P. Bartsch, 1909
Joculator steykerae A. Cecalupo & I. Perugia,2013
Cyrbasia stictica (J.H.F. Link, 1807)