Ectoconus

{{Short description|Genus of mammals (fossil)}}

{{Automatic Taxobox

| image = Ectoconus skeletal 2.png

| fossil_range = early Paleocene

| taxon = Ectoconus

| authority = Cope, 1884

| type_species = †Ectoconus ditrigonus

| subdivision_ranks = Species

| subdivision =

• E. cavigellii Eberle and Lillegraven, 1998
• E. ditrigonus (Cope, 1882) (syn. E. majusculus Matthew, 1937),
• E. symbolus Gazin, 1939

}}

Ectoconus (Greek: "outside" (ektos), "cone" (konos){{cite web|url=https://research.amnh.org/paleontology/perissodactyl/concepts/glossary|archive-url=https://web.archive.org/web/20211120123130/https://research.amnh.org/paleontology/perissodactyl/concepts/glossary|archive-date=20 November 2021|title=Glossary. American Museum of Natural History}}) is an extinct genus of terrestrial herbivorous mammal of the family Periptychidae, endemic to North America during the Early Paleocene subepochs (66—63.3 mya) existing for approximately {{Mya|66-63.3|million years}}.[https://paleobiodb.org/classic/checkTaxonInfo?taxon_no=42272 PaleoBiology Database: Bathygenys, basic info] its skull is about 16 cm in length.{{cite book

| isbn = 9780191545177

| url = https://books.google.com/books?id=iBRREAAAQBAJ&dq=Phenacodus+1.5+m&pg=PA237

| title = The Origin and Evolution of Mammals

| publisher = Oxford University Press, USA

| date = November 4, 2004

| access-date = 3 March 2024

| page = 237

| author = T. S. Kemp

}}