PBDB Taxon

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Ectocion collinus

Mammalia - Phenacodontidae

Taxonomy

Ectocion collinus was named by Russell (1929). Its type locality is Cochrane 1, which is in a Ti1 terrestrial horizon in the Paskapoo Formation of Canada.

It was synonymized subjectively with Phenacodus vortmani by West (1976).

Synonyms

Gidleyina montanensis was named by Gidley (1935) [genotype; in Simpson]. Its type locality is Princeton Locs. (Miscellaneous), which is in a Tiffanian terrestrial horizon in the "Fort Union No. 3" (= Melville) Formation of Montana. It is the type species of Gidleyina.

It was recombined as Ectocion montanensis by West (1971) and Schiebout (1974); it was synonymized subjectively with Ectocion collinus by Gingerich (1982), Krause and Gingerich (1983), Thewissen (1990) and Novacek et al. (1991).
Gidleyina silberlingi was named by Gidley (1935) [in Simpson]. Its type locality is Melville Locality 27, which is in a Tiffanian terrestrial horizon in the "Fort Union No. 3" (= Melville) Formation of Montana.

It was synonymized subjectively with Ectocion collinus by Gazin (1956), Krause and Gingerich (1983) and Thewissen (1990).
Gidleyina wyomingensis was named by Gazin (1956). Its type specimen is USNM 20790, a mandible, and it is not a trace fossil. Its type locality is West End, which is in a Tiffanian terrestrial horizon in Wyoming.

It was recombined as Ectocion wyomingensis by West (1971) and West (1976); it was synonymized subjectively with Ectocion collinus by Thewissen (1990).
Meniscotherium semicingulatum was named by Russell (1929).

It was synonymized subjectively with Ectocion collinus by Gingerich (1982), Thewissen (1990), Novacek et al. (1991), Williamson and Lucas (1992) and Scott et al. (2002).
Tetraclaenodon superior was named by Simpson (1935). Its type locality is Melville Localities 11/13, which is in a Tiffanian terrestrial horizon in the "Fort Union No. 3" (= Melville) Formation of Montana.

It was recombined as Gidleyina superior by Simpson (1937); it was synonymized subjectively with Ectocion montanensis by West (1976); it was synonymized subjectively with Ectocion wyomingensis by Krause and Gingerich (1983); it was synonymized subjectively with Ectocion collinus by Gazin (1956) and Thewissen (1990).

Synonymy list

Year	Name and author
1929	Ectocion collinus Russell
1929	Meniscotherium semicingulatum Russell
1935	Gidleyina montanensis Gidley
1935	Gidleyina silberlingi Gidley
1935	Tetraclaenodon superior Simpson
1937	Gidleyina superior Simpson
1956	Gidleyina wyomingensis Gazin pp. 42-43
1971	Ectocion montanensis West
1971	Ectocion wyomingensis West
1974	Ectocion montanensis Schiebout
1976	Ectocion wyomingensis West
1982	Ectocion collinus Gingerich
1990	Ectocion collinus Thewissen
1991	Ectocion collinus Novacek et al.

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Rank	Name	Author
kingdom	Animalia	()
—	Bilateria
—	Eubilateria	Ax 1987
—	Deuterostomia
phylum	Chordata	Haeckel 1874
subphylum	Vertebrata
superclass	Gnathostomata
—	Osteichthyes	()
subclass	Sarcopterygii	()
subclass	Dipnotetrapodomorpha	(Nelson 2006)
subclass	Tetrapodomorpha	()
—	Tetrapoda
—	Reptiliomorpha
—	Anthracosauria
subclass	Amphibiosauria	Kuhn 1967
—	Cotylosauria	()
—	Amniota
subclass	Synapsida
—	Therapsida	()
infraorder	Cynodontia	()
—	Mammaliamorpha

Rank	Name	Author
—	Mammaliaformes
class	Mammalia
—	Theriamorpha	(Rowe 1993)
—	Theriiformes	()
—	Trechnotheria
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Panperissodactyla
—	Phenacodonta
family	Phenacodontidae	Cope 1881
subfamily	Meniscotheriinae	(Cope 1882)
genus	Ectocion	Cope 1882
species	collinus	Russell 1929

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

†Ectocion collinus Russell 1929

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Invalid names: Gidleyina montanensis Gidley 1935 [synonym], Gidleyina silberlingi Gidley 1935 [synonym], Gidleyina wyomingensis Gazin 1956 [synonym], Meniscotherium semicingulatum Russell 1929 [synonym], Tetraclaenodon superior Simpson 1935 [synonym]

Diagnosis

No diagnoses are available

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialsubc

Locomotion:

actively mobilec

Life habit:

ground dwellingf

Diet:

herbivoref

Reproduction:

viviparoussubc

Created:

2005-08-31 14:04:22

Modified:

2011-04-24 18:24:26

Source: f = family, subc = subclass, c = class, subp = subphylum

References: Lillegraven 1979, Hendy et al. 2009, Ji et al. 2002, Archibald 1998, Carroll 1988

Age range: base of the Tiffanian to the top of the Danian or 61.70000 to 61.60000 Ma

Collections (27 total)

Time interval	Ma	Country or state	Original ID and collection number
Danian	66.0 - 61.6	USA (North Dakota)	Ectocion wyomingensis (14962)
Ti1	61.7 - 56.8	Canada (Alberta)	Ectocion collinus (type locality: 14938 14939 195856)
Tiffanian	61.7 - 56.8	Canada (Alberta)	Ectocion wyomingensis (14941 14954 14959)
Tiffanian	61.7 - 56.8	USA (Montana)	Ectocion collinus (15025 15047) Ectocion wyomingensis (14937) Gidleyina montanensis (15053) Gidleyina silberlingi (15040) Gidleyina superior (15037)
Tiffanian	61.7 - 56.8	USA (North Dakota)	Ectocion collinus (15006) Ectocion wyomingensis (14931 14977)
Tiffanian	61.7 - 56.8	USA (Wyoming)	Ectocion collinus (14936 15031 15060 198262) Ectocion wyomingensis (14926 14983) Gidleyina wyomingensis (14964 14989 14997 14999 15001)