Meco, Joaquín, et al. “Early Pliocene Tracer of North Atlantic and South Pacific Sea Surface Currents: Janthina Typica (Bronn, 1860) (Mollusca: Gastropoda)”. Revista Mexicana De Ciencias Geológicas, vol. 33, no. 2, May 2017, doi:10.22201/cgeo.20072902e.2016.2.496.