Joculator itiensis A. Cecalupo & I. Perugia,2014
Horologica iucunda A. Cecalupo & I. Perugia,2013
Cerithiopsis iudithae A. Reitano & G. Buzzurro,2006
Cerithiopsis iuxtafuniculata (E. Rolán, J. Espinosa& R. Fernández-Garcés, 2007)
Socienna jacksonensis (C.F. Laseron, 1951)
Cerithiopsis janira P. Bartsch in A.N. Golikov& O.A. Scarlato, 1967
Paraseila japonica T. Habe, 1970
Horologica jayi A. Cecalupo & I. Perugia,2012
Cerithiopsis jeffreysi R.B. Watson, 1885
Clathropsis joannotae Cecalupo & Perugia, 2017
Marshallopsis jolandae A. Cecalupo & I. Perugia,2013
Cerithiopsis jousseaumei M. Jay & J. Drivas, 2002
Seila kaiparaensis (FOSSIL) (C.R. Laws, 1941 †)
Joculator kanoi A. Cecalupo & I. Perugia,2013
Marshallopsis kantori A. Cecalupo & I. Perugia,2013
Joculator keratochroma M. Jay & J. Drivas, 2002
Cerithiopsilla kerguelensis (K.H.J. Thiele, 1912)
Cerithiopsis kinoi F.C. Baker, G.D. Hanna& A.M. Strong, 1938
Koilofera koilofera M. Jay & J. Drivas, 2002
Horologica konops M. Jay & J. Drivas, 2002
Cerithiopsis krisbergi E. Rolán& R. Fernández-Garcés, 2007
Belonimorphis kronenbergi (FOSSIL) M. Harzhauser, 2014 †
Seila kuiperi E. Rolán & J. Pelorce,2006
Sundaya laboutei Cecalupo & Perugia, 2017
Cerithiopsis ladae J. Prkic & G. Buzzurro,2007
Synthopsis laguncula A. Cecalupo & I. Perugia,2012
Cerithiopsis lamyi (M. Jay & J. Drivas,2002)
Tubercliopsis lanceolata A. Cecalupo & I. Perugia,2013
Synthopsis lapernai A. Cecalupo & I. Perugia,2014
Seila laqueata (A.A. Gould, 1861)
Joculator laregnereensis Cecalupo & Perugia, 2017
Joculator laseroni M. Jay & J. Drivas, 2002
Cerithiopsis lata (C.B. Adams, 1850)
Tubercliopsis lata C.F. Laseron, 1956
Synthopsis laurae A. Cecalupo & I. Perugia,2012