Bathynotus

{{Short description|Extinct genus of trilobites}}

{{Italic title}}

{{Taxobox

| fossil_range = {{Geological range|517}} late Botomian

| name = Bathynotus

| image = Bathynotus holopyga 13thAnnRepNYStateCabNatHis.jpg

| image_width = 240px

| image_caption =

| regnum = Animalia

| phylum = Arthropoda

| classis = Trilobita

| ordo = Redlichiida

| subordo = Bathynotina

| familia = Bathynotidae

| genus = Bathynotus

| genus_authority = Hall, 1860.{{cite journal|last1=Hall|year=1860|title=Contributions to Palaeontology 1858-1859|journal=Thirteenth Annual Report of the New York State Cabinet of Natural History|pages=117–119|url=https://www.biodiversitylibrary.org/item/110751#page/183/mode/1up}}{{cite journal|last1=Peng|first1=Jin|last2=Zhao|first2=Yuanlong|last3=Yuan|first3=Jinliang|last4=Yao|first4=Lu|last5=Yang|first5=Hong|year=2009|title=Bathynotus: A key trilobite taxon for global stratigraphic boundary correlation between Cambrian Series 2 and Cambrian Series 3 |journal=Progress in Natural Science|volume=19|pages=99–105|doi=10.1016/j.pnsc.2008.03.034|doi-access=free}}

| subdivision_ranks = Species

| subdivision =

• B. holopygus (Hall, 1859) (Type){{cite journal|last1=Hall|year=1859|title=Contributions to Palaeontology of New York; being some of the results of the Investigations made during the years 1855, 1856, 1857 and 1858|journal=Twelfth Annual Report of the New York State Cabinet of Natural History|pages=61|url=https://www.biodiversitylibrary.org/item/109931#page/255/mode/1up}}
• B. elongatus Zhao, Gong & Wang, 1987
• B. kueichouensis Lu in Wang et al, 1964

}}

Bathynotus is a genus of trilobites of the family Bathynotidae. Its fossils have been found in the paleocontinents Laurentia (specifically in what are now Nevada and Vermont), Gondwana (in South China and South-Australia), and - doubtfully - Siberia. It is characterized by a very wide axis in the thorax and an enlarged 11th segment that bears a long, backwardly directed spine on each side. Additionally, the 12th and 13th segments are narrow and fuse with the edge of the spine of the 11th segment.