Agassiz, L. (1838)
Recherches sur les poissons fossiles, 11th livraison (November 1838). Petitpierre et Prince (text) and H. Nicolet (plates), Neuchâtel, vol. 3: [73]-140, pl. 1a, 8a, 8b, 15, 17, 19, 20, 24, 25b, 30, 31, 32, 33, 34, 35, 39, 40.
Pictet, F.-J. (1845)
Traité élémentaire de paléontologie; ou, Histoire naturelle des animaux fossiles, considérés dans leurs rapports zoologiques et géologiques. Paris, Langlois et Leclerq, 1844-46, vol. II, pp. 259-310
Giebel, C.G. (1848)
Die Fische der Vorwelt, mit steter Berücksichtigung der lebenden Fische. Erster Band: Wirbelthiere. Dritte Abtheilung: Fische: i–xii, 1–467. Leipzig (Brockhaus).
Salter, J.W. (1861)
On the fossils of the South Wales. Memoirs of the Geological Survey, Part 3, Irons ores of South Wales: 219-239
Hancock, H. & Atthey, T. (1872)
A few Remarks on Dipterus and Ctenodus, and on their Relationship to Ceratodus Forsteri, Krefft. Transactions of the Natural History Society of Northumberland, Durham, and Newcastle–upon–Tyne, 4(17), 397–423
Woodward, A.S. (1889)
Catalogue of the fossil fishes in the British Museum. Part. I. British Museum (Natural History): 474 p., fig., 17 pl.
Traquair, R.H. (1903)
On the distribution of fossil fish-remains in the Carboniferous rocks of the Edinburgh district. Transactions of the Royal Society of Edinburgh, 40(3), 687–707
DOI: 10.1017/S0080456800034761
Moy-Thomas, J.A. (1936)
On the structure and affinities of the Carboniferous cochliodont Helodus simplex. Geological Magazine, 73, 488–503
Van der Heide, S. (1943)
La faune ichthyologique du Carbonifère supérieur des Pays-Bas. Mededeelingen van de Geologische Stichting, Serie C, IV, 3, No. 2, 65 pp. 4 pls.
Kuhn, O. (1967)
Die vorzeitlichen Fischartigen und Fische. Die Neue Brehm-Bücherei Heft 384. A. Ziemsen Verlag, Wittenberg.
Lund, R. & Garton, E.R. & Weishampel, D.B. (1979)
Fossil vertebrates of the Pennsylvanian system of West Virginia. In 9th Int. Congr. Carboniferous Stratigr. and Geol., Field Trip No. 1, AGI Selected Guidebook Series No.1, 105–107
Brusatte, S.L. (2007)
Pennsylvanian (Late Carboniferous) chondrichthyans from the LaSalle Limestone Member (Bond Formation) of Illinois, USA. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 244(1), 1–8
DOI: 10.1127/0077-7749/2007/0244-0001
Brazeau, M.D. & Friedman, M. (2014)
The characters of Palaeozoic jawed vertebrates. Zoological Journal of the Linnean Society, 170(4), 779–821
DOI: 10.1111/zoj.12111
Itano, W.M. & Lambert, L.L. (2018)
A new cochliodont anterior tooth plate from the Mississippian of Alabama (USA) having implications for the origin of tooth plates from tooth files. Zoological Letters, 4, Article 12
DOI: 10.1186/s40851-018-0097-8
Richards, K.R. & Sherwin, J.E. & Smithson, T.R. & Bennion, R.F. & Davies, S.J. & Marshall, J.E.A. & Clack, J.A. (2018)
Diverse and durophagous: Early Carboniferous chondrichthyans from the Scottish Borders. Earth and Environmental Science Transactions of the Royal Society of Edinburgh, 108(1), 67–87
DOI: 10.1017/s1755691018000166
Johanson, Z. & Manzanares, E. & Underwood, C. & Clark, B. & Section, V.F. & Smith, M. (2020)
Evolution of the Dentition in Holocephalans (Chondrichthyes) Through Tissue Disparity. Integrative and Comparative Biology: 60(3): 630–643
DOI: 10.1093/icb/icaa093
Coates, M.I. & Tietjen, K. & Johanson, Z. & Friedman, M. & Sang, S. (2021)
The cranium of Helodus simplex (Agassiz, 1838) revised. In: Ancient Fishes and their Living Relatives: a Tribute to John G. Maisey. Alan Pradel, John S. S. Denton & Philippe Janvier (eds.): pp. 193-204, Verlag Dr. Friedrich Pfeil, München, Germany
Johanson, Z. & Underwood, C. & Coates, M.I. & Fernandez, V. & Clark, B. & Smith, M.M. (2021)
The stem-holocephalan Helodus (Chondrichthyes; Holocephali) and the evolution of modern chimaeroid dentitions. In: Ancient Fishes and their Living Relatives: a Tribute to John G. Maisey. Alan Pradel, John S. S. Denton & Philippe Janvier (eds.): pp. 205-214, Verlag Dr. Friedrich Pfeil, München, Germany
Brownstein, C.D. & Near, T.J. & Dearden, R.P. (2024)
The Palaeozoic assembly of the holocephalan body plan far preceded post-Cretaceous radiations into the ocean depths. Proceedings of the Royal Society B-Biological Sciences, 291(2033), Article 20241824
DOI: 10.1098/rspb.2024.1824
Schnetz, L. & Dunne, E.M. & Feichtinger, I. & Butler, R.J. & Coates, M.I. & Sansom, I.J. (2024)
Rise and diversification of chondrichthyans in the Paleozoic. Paleobiology, in press
DOI: 10.1017/pab.2024.1