This mentioned taxonomy is an attempt to make an conclusive assignment from the different classifications of various scientists. Because the taxonomy may change due to the latest investigative methods and other findings, our map is a guide only.
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R. Rivera, 1957 - Moluscos fosiles de la Formacion Paracas, Dpto. de Ica - Sociedad Geologica del Peru Primer Congreso Nacional de Geologia Anales - Parte II (32), 165-219 (journal article, English)
P. N. Mukerjee, 1939 - Fossil fauna from the Tertiary of Garo Hills, Assam - Palaeontologia Indica (28), 1-101 (serial monograph, English)
A. A. Olsson, 1931 - Contributions to the Tertiary Paleontology of Northern Peru: Part 4, The Peruvian Oligocene - Bulletins of American Paleontology (17), - (journal article, English)
A. A. Olsson, 1928 - Contributions to the Tertiary paleontology of northern Peru: Part 1 - Bulletins of American Paleontology (14), - (serial monograph, English)
C. E. Weaver, 1922 - Fauna from the Eocene of Washington - University of Washington Publications in Geology (1), 1-56 (journal article, English)
A. A. Olsson, 1922 - The Miocene of Northern Costa Rica - Bulletins of American Paleontology (9), 1-309 (serial monograph, English)
C. J. Maury, 1912 - A contribution to the paleontology of Trinidad - Journal of the Academy of Natural Sciences of Philadelphia (15), 1-112 (serial monograph, English)
A. P. Brown, 1911 - Fauna of the Gatun Formation, Isthmus of Panama - Proceedings of the Academy of Natural Sciencesof Philadelphia (63), 336-373 (journal article, English)
I. Born, 1778 - - Index rerum naturalium Musei Cæsarei Vindobonensis - Pars I ma Testacea - Verzeichniß der natürlichen Seltenheiten des k k Naturalien Cabinets zu Wien - Erster Theil - Schalthiere - Vindobonae (), 1-458 (book/book chapter, German)