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Ectocion information


Ectocion
Temporal range: Paleocene - Eocene
Ectocion osbornianus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Family: Phenacodontidae
Genus: Ectocion
Cope, 1882
Species
  • E. cedrus Thewissen, 1990
  • E. collinus Russell, 1929
  • E. ignotum Novacek et al., 1991
  • E. major Patteron & West, 1973
  • E. mediotuber Thewissen, 1990
  • E. nanabeensis Beard & Dawson, 2009[1]
  • E. osbornianus Cope, 1882
  • E. parvus Granger, 1915
  • 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]

  1. ^ 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.
  2. ^ 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.
  3. ^ a b Ectocion in the Paleobiology Database. Retrieved May 2013.
  4. ^ 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.
  5. ^ Gingerich, Phil (2009). "Big Little Big". Smithsonian National Museum of Natural History.

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Ectocion

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Ectocion (sometimes Ectocyon) is an extinct genus of placental mammals of the family Phenacodontidae. The genus was earlier classified as Gidleyina (Simpson...

Word Count : 292

Phenacodontidae

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1989 Genus Ectocion Cope, 1882 Ectocion cedrus Thewissen, 1990 Ectocion collinus Russell, 1929 Ectocion ignotum Novacek et al., 1991 Ectocion major (Patteron...

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Condylarthra

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(established as stem-Perissodactyla) Subfamily Meniscotheriinae Genus Ectocion Genus Meniscotherium Genus Almogaver Genus Copecion Genus Eodesmatodon...

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Copecion

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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...

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Tiffanian

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Condylarthra - archaic ungulates Claenodon, large, arctocyonid condylarth Ectocion, phenacodontid condylarth Lambertocyon, arctocyonid condylarth Phenacodus...

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Evolution of the horse

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ungulates.[citation needed] It contains the genera Almogaver, Copecion, Ectocion, Eodesmatodon, Meniscotherium, Ordathspidotherium, Phenacodus and Pleuraspidotherium...

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Olbitherium

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lower cheek teeth more closely resemble those of phenacodontids, such as Ectocion, Phenacodus, and Copecion. Due to these conflicting similarities, Tong...

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List of the Cenozoic life of Wyoming

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locality for species †EctocionEctocion cedrus – type locality for species †Ectocion collinus – type locality for species †Ectocion major – or unidentified...

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Las Tetas de Cabra Formation

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Caenolambda jepseni Perissodactyls Eohippus cf. angustidens Placentalia Ectocion ignotum Meniscotherium chamense Phenacodus vortmani cf. Hyopsodus sp. Theriiformes...

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Ocepeia

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similarities to the arctocyonid Lambertocyon as well as the phenacodontid Ectocion. Upon reviewing new material in 2010, which included a more complete jawbone...

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2021 in paleomammalogy

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S. (2021). "A new, "dwarfed" species of the phenacodontid "condylarth" Ectocion from the late Paleocene of Alberta, Canada, and its implications". Canadian...

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Azygonyx

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Paleocene Eocene Thermal Maximum along with other mammals like Phenacodus and Ectocion, both of which were ground-dwelling mammals. Azygonyx probably was a generalist...

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List of the Cenozoic life of Montana

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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 †EctocionEctocion cedrus †Ectocion collinus †Ectoganus †Ectoganus lobdelli †Ectypodus †Ectypodus...

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Indian Meadows Formation

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Homogalax sp. Equidae indet. Placentalia Hyopsodus loomisi Phenacodus vortmani Ectocion cf. osbornianus Hyopsodus sp. Phenacodus sp. Theriiformes Oxyaenidae indet...

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List of the Cenozoic life of Mississippi

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scintillatus †Eburneopecten subminutus Echinolampas †Echinolampas aldrichi †EctocionEctocion nanabeensis – type locality for species †Egertonia †Egertonia isodonta...

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List of the Cenozoic life of North Dakota

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L M N O P Q R S T U V W X Y Z †Echmatemys †Echmatemys testudinea †EctocionEctocion collinus †Ectypodus †Ectypodus hazeni †Ectypodus lovei †Elliptio †Elliptio...

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List of the prehistoric life of Montana

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†Dissacus Dolichoderus †Domnina †Dromomeryx †Dromomeryx borealis Dryopteris †Ectocion †Elomeryx – tentative report †Eoconodon †Eoconodon nidhoggi †Eotitanops...

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Fort Union Formation

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Mandible (YPM-PU 16159). A mesonychid also known from the Willwood Formation. Ectocion E. mediotuber Princeton Quarry, Wyoming. Dentary. A phenacodontid. Periptychus...

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List of the Cenozoic life of Colorado

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kohlsi – type locality for species †EctocionEctocion major †Ectocion medituber †Ectocion osbornianus †Ectocion parvus †Ectoconus †Ectoconus ditrigonus...

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Clarkforkian

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carnivoran Condylarthra - archaic ungulates Apheliscus, hyopsodontid condylarth Ectocion, phenacodontid condylarth Phenacodus, phenacodontid condylarth Thryptacodon...

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Proectocion

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its name implies, Ameghino considered that Proectocion was ancestral to Ectocion, a North American Phenacodontidae, and ascribed both genera to the family...

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Willwood Formation

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mesonychid. D. willwoodensis Bighorn Basin, Wyoming. Mandibles. A mesonychid. Ectocion E. osbornianus Locality SC-67 and SC-351. 2 fragmentary dentaries. and...

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Wasatch Formation

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Coryphodon sp. Pholidota Palaeanodon sp. Placentalia Copecion brachypternus Ectocion collinus E. osbornianus E. superstes Hyopsodus loomisi H. minor H. minusculus...

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2009 in paleomammalogy

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Duerotherium Valid Cuesta Badiola Middle Eocene An anoplotheriine artiodactyl Ectocion nanabeensis Valid Beard & Dawson Early Wasatchian  United States Eogale...

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List of the prehistoric life of North Dakota

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†dicot †Didymictis †Dinictis †Dissacus †Dombeya †Domnina †Echmatemys †Ectocion †Elliptio †Elomeryx †Equisetum †Error †Eucommia Ficus †Fraxinus Ginkgo...

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List of the prehistoric life of Mississippi

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Dinocardium Diodon Diodora Discopsis Distorsio †Dolicholatirus Donax †Dorudon †Ectocion †Egertonia Elphidium Emydoidea †Emydoidea blandingii Enaeta †Eosurcula...

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List of the prehistoric life of Wyoming

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†Distylium Dolichopus †Dombeya †Domnina †Drimys Dryopteris †Echmatemys †Ectocion †Ectoconus †Ectopistes †Ectopistes migratorius †Ectopocynus †Elaeodendron...

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List of the prehistoric life of Colorado

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species †Dryobius Dryopteris Dyschirius †Dysdercus †Echmatemys †Ectobius †Ectocion †Ectoconus †Elaeomyrmex – type locality for genus †Elaeomyrmex coloradensis...

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