| Reference no. | Description | year | Name used | Page |
|---|---|---|---|---|
| 833 | Ruppert, E.E., R.S. Fox and R.D. Barnes 2004 Invertebrate Zoology. A functional evolutionary approach. 7th Ed. Brooks/Cole, Thomson Learning learning, Inc. 990 p. | 2004 | Cadulus simillimus | --> |
| 1821 | Steiner, G. and A.R. Kabat 2004 Catalog of species-group names of recent and fossil Scaphopoda (Mollusca). Zoosystema 26(4):549-726. | 2004 | Cadulus simillimus | 644 |
| 98950 | Smithsonian Institution 2015 Cadulus simillimus. http://collections.si.edu/search/results.htm?q=Cadulus%09simillimus [Accessed 01/20/2015]. | 2015 | Cadulus simillimus | --> |