Simone, Luiz Ricardo L. “ Comparative Morphology Among Representatives of Main Taxa of Scaphopoda and Basal Protobranch Bivalvia (Mollusca) ”. Papéis Avulsos De Zoologia, vol. 49, no. 32, Jan. 2009, pp. 405-57, https://doi.org/10.1590/S0031-10492009003200001.