Bonnerichthys

{{Short description|Extinct genus of fishes}}

{{speciesbox

| fossil_range = Late Cretaceous, {{fossilrange|89|66}}

| image = Bonnerichthys gladius.png

| image_caption = Restoration

| genus = Bonnerichthys

| parent_authority = Friedman et al., 2010

| species = gladius

| authority = (Cope, 1873)

| synonyms =

• Portheus gladius Cope, 1873
• Protosphyraena gladius (Cope, 1873)

}}

Bonnerichthys is a genus of fossil fishes within the family Pachycormidae that lived during the Coniacian to Maastrichtian stage of the Late Cretaceous.{{cite journal |author=Matt Friedman |author2=Kenshu Shimada |author3=Larry D. Martin |author4=Michael J. Everhart |author5=Jeff Liston |author6=Anthony Maltese |author7=Michael Triebold |name-list-style=amp |year=2010 |title=100-million-year dynasty of giant planktivorous bony fishes in the Mesozoic seas |journal=Science |volume=327 |issue=5968 |pages=990–993 |pmid=20167784 |doi=10.1126/science.1184743|bibcode=2010Sci...327..990F |s2cid=206524637 |url=http://doc.rero.ch/record/211158/files/PAL_E4413.pdf }} Fossil remains of this taxon were first described from the Smoky Hill Member of the Niobrara Chalk Formation of Kansas (Late Coniacian-Early Campanian), and additional material was later reported from the Pierre Shale, Mooreville Chalk, Demopolis Chalk, Wenonah Formation, and Moreno Formation, among other localities.{{cite journal |last1=Friedman |first1=Matt |last2=Shimada |first2=Kenshu |last3=Everhart |first3=Michael J. |last4=Irwin |first4=Kelly J. |last5=Grandstaff |first5=Barbara S. |last6=Stewart |first6=J. D. |title=Geographic and stratigraphic distribution of the Late Cretaceous suspension-feeding bony fish Bonnerichthys gladius (Teleostei, Pachycormiformes) |journal=Journal of Vertebrate Paleontology |date=8 January 2013 |volume=33 |issue=1 |pages=35–47 |doi=10.1080/02724634.2012.713059 |bibcode=2013JVPal..33...35F |s2cid=128958842 |url=https://www.tandfonline.com/doi/abs/10.1080/02724634.2012.713059|url-access=subscription }} It has also been reported in European Russia, specifically from the Rybushka Formation of the Saratov Region.{{cite journal|author1=Kanarkina, A.|author2=Zverkov, Nikolay G.|author3=Popov, Evgeny V.|year=2025|title=The first record of the pachycormid fish Bonnerichthys in Eurasia marks a global distribution of Late Cretaceous suspension-feeding giants|journal=Journal of Palaeogeography|at=100255|doi=10.1016/j.jop.2025.100255|doi-access=free}} It grew to at least {{convert|5|m|ft}} in total body length, substantially less than the related Leedsichthys from the Jurassic which likely grew up to {{convert|16.5|m|ft}}.{{cite book|author=Liston, J., Newbrey, M., Challands, T., and Adams, C., 2013|chapter=Growth, age and size of the Jurassic pachycormid Leedsichthys problematicus (Osteichthyes: Actinopterygii)|editor=Arratia, G., Schultze, H. and Wilson, M.|title=Mesozoic Fishes 5 – Global Diversity and Evolution|year=2013 |publisher=Verlag Dr. Friedrich Pfeil|location=München, Germany|pages=145–175|isbn=9783899371598|chapter-url=https://eprints.gla.ac.uk/81797/1/81797.pdf}}