| Reference no. | Description | year | Name used | Page |
|---|---|---|---|---|
| 88965 | Bale, W.M. 1924 Report on some hydroids from the New Zealand Coast, with notes on New Zealand Hydroida generally, supplementing Farquhar's list. Transactions and Proceedings of the New Zealand Institute 55:225-268, figs.1-18. | 1924 | Synthecium orthogonium | 226,250-251 |
| 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 | Synthecium orthogonium | --> |
| 8278 | Bouillon, J., C. Gravili, F. Pagès, J.-M. Gili and F. Boero 2006 An introduction to Hydrozoa. Mémoires du Muséum national d'Histoire naturelle 194:1-591. | 2006 | Synthecium orthogonium | --> |
| 98163 | Smithsonian Institution 2014 Synthecium orthogonium (Busk, 1852). http://collections.si.edu/search/results.htm?q=Synthecium%09orthogonium [Accessed 12/01/2014]. | 2014 | Synthecium orthogonium | --> |
| 99267 | Atlas of Living Australia 2015 Occurrence of Synthecium orthogonium. http://biocache.ala.org.au/occurrences/a7950133-f988-434c-b628-0b6bf46c7fbe [Accessed 1/23/2015]. | 2015 | Synthecium orthogonium | --> |
| 99733 | Smithsonian Institution 2015 Synthecium orthogonium (Busk, 1852). http://collections.si.edu/search/record/nmnhinvertebratezoology_13479 [Accessed 2/9/2015]. | 2015 | Synthecium orthogonium | --> |