1. Allison, R C., 1967. The Cenozoic Stratigraphy of Chiapas, Mexico, with Discussions of the Classification of the Turritellidae and Selected Mexican representatives. Berkeley, University of California. Ph. D. thesis, 449 p., Unpublished.
2. The Turritella rina group (Gastropoda) and its relationship to Torcula Gray;Allison;Journal of Paleontology,1969
3. New terrestrial amphipod from Tertiary amber deposits of Chiapas province, southern Mexico;Bousfield;Historical Biology,1994
4. Fauna of the Gatun formation, Isthmus of Panama; pt. 2;Brown;Proceedings of the Academy of Natural Science of Philadelphia,1913