|Carapace of H. excelsior|
Hallipterus was a gigantic Hardieopterid eurypterid. Though some previous estimates have placed its size at over 1.5 meters in length, these were likely excessive. Still, assigned specimens suggest a size of over 1 meter long.
The carapace was subelliptical, greater in length than in width, with a prominent and unornamented marginal rim. The eyes were very small, close to each other and separated by a prominent median ridge with large ocelli at the posterior extremity.
Hallipterus contains one valid species, H. excelsior, from the Devonian of New York. Another species was once recognized from similarly aged deposits in Pennsylvania, "H. lacoanus", but it is today seen as synonymous with H. excelsior.
- Tetlie, O. E. (2008). "Hallipterus excelsior, a Stylonurid (Chelicerata: Eurypterida) from the Late Devonian Catskill Delta Complex, and Its Phylogenetic Position in the Hardieopteridae". Bulletin of the Peabody Museum of Natural History. 49: 19–99. doi:10.3374/0079-032X(2008)49[19:HEASCE]2.0.CO;2.
- "Page:A Revision of the Families and Genera of the Stylonuracea (Eurypterida).djvu/28 - Wikisource, the free online library". en.wikisource.org. Retrieved 2017-12-28.
- Dunlop, J. A., Penney, D. & Jekel, D. 2015. A summary list of fossil spiders and their relatives. In World Spider Catalog. Natural History Museum Bern, online at http://wsc.nmbe.ch, version 16.0 http://www.wsc.nmbe.ch/resources/fossils/Fossils16.0.pdf (PDF).
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