PBDB Taxon

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Diacodexis secans

Mammalia - Diacodexeidae

Taxonomy

Pantolestes secans was named by Cope (1881). Its type specimen is AMNH 4899, a set of teeth (left and right P4 - M3), and it is a 3D body fossil.

It was recombined as Trigonolestes secans by Matthew (1899) and Hay (1902); it was recombined as Diacodexis secans by Cope (1882), Sinclair (1914), Guthrie (1971), Krishtalka and Stucky (1985), Stucky (1998), Thewissen et al. (2001) and Theodor et al. (2007).

Sister species lacking formal opinion data

D. varleli

Synonyms

Diacodexis olseni was named by Sinclair (1914).

It was synonymized subjectively with Diacodexis secans by Guthrie (1971), Krishtalka and Stucky (1985), Krishtalka and Stucky (1986) and Theodor et al. (2007).
Mioclaenus brachystomus was named by Cope (1882). It is the type species of Trigonolestes.

It was recombined as Pantolestes brachystomus by Cope (1884); it was recombined as Trigonolestes brachystomus by Cope (1894), Matthew (1899) and Hay (1902); it was synonymized subjectively with Diacodexis chacensis by Sinclair (1914); it was synonymized subjectively with Diacodexis metsiacus by Gazin (1952), Guthrie (1967), Krishtalka and Stucky (1985) and Krishtalka and Stucky (1986); it was synonymized subjectively with Diacodexis secans by Theodor et al. (2007).
Phenacodus laticuneus was named by Cope (1882).

It was recombined as Diacodexis laticuneus by Cope (1883), Cope (1884) and Sinclair (1914); it was recombined as Hyopsodus laticuneus by Matthew (1899), Osborn (1902) and Hay (1902); it was synonymized subjectively with Diacodexis secans by Krishtalka and Stucky (1985) and Theodor et al. (2007).

Synonymy list

Year	Name and author
1881	Pantolestes secans Cope p. 187
1882	Diacodexis secans Cope
1882	Phenacodus laticuneus Cope p. 181
1882	Mioclaenus brachystomus Cope pp. 187-188
1883	Diacodexis laticuneus Cope
1884	Diacodexis laticuneus Cope
1884	Pantolestes brachystomus Cope
1894	Trigonolestes brachystomus Cope
1899	Hyopsodus laticuneus Matthew
1899	Trigonolestes brachystomus Matthew
1899	Trigonolestes secans Matthew
1902	Trigonolestes brachystomus Hay p. 649
1902	Trigonolestes secans Hay p. 649
1902	Hyopsodus laticuneus Hay p. 790
1902	Hyopsodus laticuneus Osborn p. 184 figs. Figure 10
1914	Diacodexis laticuneus Sinclair
1914	Diacodexis olseni Sinclair
1914	Diacodexis secans Sinclair
1971	Diacodexis secans Guthrie
1985	Diacodexis secans Krishtalka and Stucky
1998	Diacodexis secans Stucky
2001	Diacodexis secans Thewissen et al. p. suppl.
2007	Diacodexis secans Theodor et al. p. 40

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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	()

Rank	Name	Author
infraorder	Cynodontia	()
—	Mammaliamorpha
—	Mammaliaformes
class	Mammalia
—	Cladotheria
—	Zatheria
subclass	Tribosphenida	()
subclass	Theria
—	Eutheria	()
—	Placentalia
—	Boreoeutheria
—	Laurasiatheria
—	Scrotifera
—	Euungulata
—	Artiodactylamorpha
—	Artiodactyla	()
family	Diacodexeidae
genus	Diacodexis
species	secans	()

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.

†Diacodexis secans Cope 1881

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Invalid names: Diacodexis laticuneus Cope 1882 [synonym], Diacodexis olseni Sinclair 1914 [synonym], Mioclaenus brachystomus Cope 1882 [synonym]

Diagnosis

Reference	Diagnosis
L. Krishtalka and R. K. Stucky 1985	Larger than all penecontemporaneous species of Dia- codexis and more robust than D. gracilis, D. minutus and Artiodactyla sp. A and sp. B, with more inflated molar protocones, metaconids and hypoconids. Additionally, differs from D. gracilis in having a less re- duced and less medial paraconid on M1_3, and more nearly square M1_2; M1_3 talonids more shallow and cusps more bunodont than in Artiodactyla sp. A and sp. B and D. minutus; M1_3 metaconids less inflated in proportion to tooth size than in D. woltonensis; M 1_ 3 para- conids and paracristids more developed than in Artiodactyla sp. A and sp. B, paraconids and metaconids less elevated, entoconid lower than hypoconid and hypoconulid not lingually placed near entoconid.

Measurements

No measurements are available

Composition:

phosphaticsubp

Environment:

terrestrialo

Locomotion:

actively mobilec

Life habit:

ground dwellingg

Diet:

herbivoreg

Reproduction:

viviparoussubc

Created:

2005-08-31 14:10:21

Modified:

2011-04-24 18:45:24

Source: g = genus, o = order, subc = subclass, c = class, subp = subphylum

References: Nowak 1999, Stucky 1998, Hendy et al. 2009, Lillegraven 1979, Carroll 1988

Age range: base of the Wasatchian to the top of the Bridgerian or 55.80000 to 46.20000 Ma

Collections (39 total)

Time interval	Ma	Country or state	Original ID and collection number
Lostcabinian	55.8 - 50.3	USA (Wyoming)	Diacodexis olseni (15915 16078) Diacodexis secans (15917 15930 15950 15997) Diacodexis secans, Diacodexis olseni (16073)
Wasatchian	55.8 - 50.3	USA (Wyoming)	Diacodexis olseni (15908 15910 15943) Diacodexis secans (15486 15557 15565 15566 15839 15851 15852 15922 15946 15948 15949 15954 15962 15989 15993 186931 186933 186944 186946 186952) Diacodexis secans, Diacodexis olseni (15942)
Wasatchian	55.8 - 50.3	USA (Colorado)	Diacodexis secans (15224)
Wasatchian - Bridgerian	55.8 - 46.2	USA (Wyoming)	Diacodexis secans (15669)
Bridgerian	50.3 - 46.2	USA (Wyoming)	Diacodexis olseni (16207) Diacodexis secans (16183 16246 16439 16504) Diacodexis secans, Diacodexis olseni (16388)