E. stockeyae Montellano-Ballesteros et al., 2021[2]
E. superstes Granger, 1915
Ectocion (sometimes Ectocyon) is an extinct genus of placental mammals of the family Phenacodontidae. The genus was earlier classified as Gidleyina (Simpson 1935) and Prosthecion (Patterson and West 1973)[3] It reached 6 to 12 kg and was similar in size and morphology to Copecion. Both these herbivorous ungulates likely occupied similar ecological niches.[4]
Paleocene specimens of these hoofed, ground-dwelling herbivores have been found in Canada (Alberta, Saskatchewan) and the United States (Colorado, Montana, North Dakota, and Wyoming). Eocene specimens have been found in Mexico and the United States (Colorado, Mississippi, Wyoming).[3]
One of the dramatic effects of the Paleocene–Eocene Thermal Maximum (PETM) was some animals evolving smaller bodies. Fossilized Ectocion jaw bones show that this genus was smaller during (E. parvus, 55.5 mya) the PETM than its relatives before (E. osbornianus, 55.6 mya) and after (E. osbornianus, 55.3 mya) the brief climatic peak period.[5]
^Beard, K. C.; Dawson, M. R. (2009). "Early Wasatchian Mammals of the Red Hot Local Fauna, Uppermost Tuscahoma Formation, Lauderdale County, Mississippi". Annals of Carnegie Museum. 78 (3): 193–243. doi:10.2992/007.078.0301. S2CID 86281527.
^Montellano-Ballesteros, M.; Fox, R. C.; Scott, C. S. (2021). "A new, "dwarfed" species of the phenacodontid "condylarth" Ectocion from the late Paleocene of Alberta, Canada, and its implications". Canadian Journal of Earth Sciences. 58 (11): 1155–1169. doi:10.1139/cjes-2019-0234. hdl:1807/107869.
^ abEctocion in the Paleobiology Database. Retrieved May 2013.
^Andrew Schwartz (November 2023). "Investigating Niche Overlap in Two Sympatric Phenacodonts using Dental Microwear Texture Analysis". 83rd Annual Meeting Society of Vertebrate Paleontology at Cincinnati, Ohio.
^Gingerich, Phil (2009). "Big Little Big". Smithsonian National Museum of Natural History.
Ectocion (sometimes Ectocyon) is an extinct genus of placental mammals of the family Phenacodontidae. The genus was earlier classified as Gidleyina (Simpson...
(established as stem-Perissodactyla) Subfamily Meniscotheriinae Genus Ectocion Genus Meniscotherium Genus Almogaver Genus Copecion Genus Eodesmatodon...
Phenacodontidae. It reached 6 to 12 kg and was similar in size and morphology to Ectocion. Both these herbivorous ungulates likely occupied similar ecological niches...
ungulates.[citation needed] It contains the genera Almogaver, Copecion, Ectocion, Eodesmatodon, Meniscotherium, Ordathspidotherium, Phenacodus and Pleuraspidotherium...
lower cheek teeth more closely resemble those of phenacodontids, such as Ectocion, Phenacodus, and Copecion. Due to these conflicting similarities, Tong...
locality for species †Ectocion †Ectocion cedrus – type locality for species †Ectocion collinus – type locality for species †Ectocion major – or unidentified...
similarities to the arctocyonid Lambertocyon as well as the phenacodontid Ectocion. Upon reviewing new material in 2010, which included a more complete jawbone...
S. (2021). "A new, "dwarfed" species of the phenacodontid "condylarth" Ectocion from the late Paleocene of Alberta, Canada, and its implications". Canadian...
Paleocene Eocene Thermal Maximum along with other mammals like Phenacodus and Ectocion, both of which were ground-dwelling mammals. Azygonyx probably was a generalist...
Contents A B C D E F G H I J K L M N O P Q R S T U V W X Y Z †Ectocion †Ectocion cedrus †Ectocion collinus †Ectoganus †Ectoganus lobdelli †Ectypodus †Ectypodus...
L M N O P Q R S T U V W X Y Z †Echmatemys †Echmatemys testudinea †Ectocion †Ectocion collinus †Ectypodus †Ectypodus hazeni †Ectypodus lovei †Elliptio †Elliptio...
Mandible (YPM-PU 16159). A mesonychid also known from the Willwood Formation. Ectocion E. mediotuber Princeton Quarry, Wyoming. Dentary. A phenacodontid. Periptychus...
kohlsi – type locality for species †Ectocion †Ectocion major †Ectocion medituber †Ectocion osbornianus †Ectocion parvus †Ectoconus †Ectoconus ditrigonus...
its name implies, Ameghino considered that Proectocion was ancestral to Ectocion, a North American Phenacodontidae, and ascribed both genera to the family...
mesonychid. D. willwoodensis Bighorn Basin, Wyoming. Mandibles. A mesonychid. Ectocion E. osbornianus Locality SC-67 and SC-351. 2 fragmentary dentaries. and...
Coryphodon sp. Pholidota Palaeanodon sp. Placentalia Copecion brachypternus Ectocion collinus E. osbornianus E. superstes Hyopsodus loomisi H. minor H. minusculus...
Duerotherium Valid Cuesta Badiola Middle Eocene An anoplotheriine artiodactyl Ectocion nanabeensis Valid Beard & Dawson Early Wasatchian United States Eogale...
species †Dryobius Dryopteris Dyschirius †Dysdercus †Echmatemys †Ectobius †Ectocion †Ectoconus †Elaeomyrmex – type locality for genus †Elaeomyrmex coloradensis...