Type specimens of fossil " Architectibranchia " and Cephalaspidea (Mollusca, Heterobranchia) in the Academy of Natural Sciences of Philadelphia Author Cunha, Carlo M. Author Salvador, Rodrigo B. text Zoosystematics and Evolution 2018 94 2 505 527 http://dx.doi.org/10.3897/zse.94.27401 journal article http://dx.doi.org/10.3897/zse.94.27401 1860-0743-2-505 09EC3F78C68C4F9CA76D008DDAE13B3E Retusa biforis Pilsbry & Johnson, 1917 Figure 5 E-F Retusa biforis Pilsbry & Johnson, 1917: 151 Type locality. Dominican Republic. Type stratum: "Santo Domingan Beds" (either Cercado or Gurabo Formations); age: Miocene/Pliocene. Type material. Holotype, ANSP IP3192 (as "type" in Richards 1968 : 106). Current taxonomic status. Retusa biforis Pilsbry & Johnson, 1917 ( Pilsbry 1922 ).