Marks, J. G., 1951. Miocene Stratigraphy and Paleontology of Southwestern Ecuador. Bulletins of American Paleontology, 23 (139 ).
New Species-Group Names:
- ecuadorensis Marks, 1951. p. 142. pl. 9. f. 10. 11.
-
masasensis Marks, 1951. p. 139. pl. 8. f. 9-10.
-
roigi Marks, 1951. p. 140. pl. 9. f. 7. 9.