Gnathodus

{{Short description|Extinct genus of jawless fishes}}

{{Italic title}}

{{taxobox

| fossil_range = {{fossil_range|Early Carboniferous}}

| image = Conodonts.jpg

| image_caption = Conodont elements from the Deer Valley Member of the Mauch Chunk Formation
{{hidden|detail|Figures 3–9. Conodonts from the uppermost Loyalhanna Limestone Member of the Mauch Chunk Formation, Keystone quarry, Pa. This collection (93RS–79b) is from the upper 10 cm of the Loyalhanna Member. Note the highly abraded and reworked aeolian forms. 9. Gnathodus texanus?, Pa element, upper view, X140.
Figures 10–14. Conodonts from the basal 20 cm of the Loyalhanna Limestone Member of the Mauch Chunk Formation, Keystone quarry, Pa. (93RS–79a), and Westernport, Md. (93RS–67). Note the highly abraded and reworked aeolian forms. 12. Gnathodus sp., Pa element, upper view, reworked Late Devonian(?) through Mississippian morphotype, 93RS–67, X140.}}

| regnum = Animalia

| phylum = Chordata

| classis = †Conodonta

| ordo = †Ozarkodinida

| familia = †Idiognathodontidae

| genus = †Gnathodus

| genus_authority = Pander, 1856Monographie der fossilen fische des silurischen systems des Russisch-baltischen gouvernements. CH Pander, 1856

| subdivision_ranks = Species

| subdivision =

• †Gnathodus bilineatus
• †Gnathodus bollandensis
• †Gnathodus postbilineatus
• †Gnathodus pseudosemiglaber
• †Gnathodus semiglaber
• †Gnathodus texanus
• †Gnathodus typicus

| synonyms =

}}

Gnathodus is an extinct conodont genus in the family Idiognathodontidae.