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Ticholeptus calimontanus

Mammalia - Merycoidodontidae

Taxonomy
Merychyus calimontanus was named by Dougherty (1940). Its type specimen is CIT 2543, a partial skeleton (Partial skull with I1-M3, right calcaneum, left astragalus, metatarsal, and proximal phalanx), and it is a 3D body fossil. Its type locality is Padrones Spring, which is in a Miocene terrestrial horizon in California.

It was synonymized subjectively with Merychyus elegans by Kelly and Lander (1988); it was synonymized subjectively with Merychyus smithi by Lander (1998); it was recombined as Ticholeptus calimontanus by Schultz and Falkenbach (1941), Repenning and Vedder (1961), Munthe (1979), Stevens and Stevens (2007) and Stevens et al. (2023).

Synonyms
  • Ticholeptus tooheyi was named by Schultz and Falkenbach (1941). Its type specimen is UNSM 1-15-9-36SP, a partial skeleton (Anterior portion of skull with I1-M3, partial mandible with i1-m3, partial humerus, 2 partial radii, 2 partial tibiae, 2 calcanea, astragalus, manus and pes ele), and it is a 3D body fossil.

    It was synonymized subjectively with Merychyus elegans by Kelly and Lander (1988); it was synonymized subjectively with Merychyus smithi by Lander (1998); it was synonymized subjectively with Ticholeptus calimontanus by Stevens et al. (2023).
Synonymy list
YearName and author
1940Merychyus calimontanus Dougherty
1941Ticholeptus calimontanus Schultz and Falkenbach p. 75
1941Ticholeptus tooheyi Schultz and Falkenbach p. 84
1961Ticholeptus calimontanus Repenning and Vedder
1979Ticholeptus calimontanus Munthe
2007Ticholeptus calimontanus Stevens and Stevens p. 164
2023Ticholeptus calimontanus Stevens et al. p. 93 figs. Figures 75-76; Appendix 9B; Table A31

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RankNameAuthor
kingdomAnimalia()
—Bilateria
—EubilateriaAx 1987
—Deuterostomia
phylumChordataHaeckel 1874
subphylumVertebrata
superclassGnathostomata
—Osteichthyes()
subclassSarcopterygii()
subclassDipnotetrapodomorpha(Nelson 2006)
subclassTetrapodomorpha()
—Tetrapoda
—Reptiliomorpha
—Anthracosauria
subclassAmphibiosauriaKuhn 1967
—Cotylosauria()
—Amniota
subclassSynapsida
—Therapsida()
infraorderCynodontia()
—Mammaliamorpha
RankNameAuthor
—Mammaliaformes
classMammalia
—Theriamorpha(Rowe 1993)
—Theriiformes()
—Trechnotheria
—Cladotheria
—Zatheria
subclassTribosphenida()
subclassTheria
—Eutheria()
—Placentalia
—Boreoeutheria
—Laurasiatheria
—Scrotifera
—Euungulata
—Artiodactylamorpha
—Artiodactyla()
familyMerycoidodontidae
subfamilyTicholeptinae
genusTicholeptus
speciescalimontanus()

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.

†Ticholeptus calimontanus Dougherty 1940
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Invalid names: Ticholeptus tooheyi Schultz and Falkenbach 1941 [synonym]
Diagnosis
ReferenceDiagnosis
C. B. Schultz and C. H. Falkenbach 1941SKULL.-Known only from palate and fragmentary maxilla; smallest form of the genus.
MANDIBLE.-Known only from fragmentary specimen. DENTITION.-Smallest dental series of the genus. LIMBs.-Known only from foot bones.
C. B. Schultz and C. H. Falkenbach 1941 (Ticholeptus tooheyi)SKULL.-Smaller and lighter construction throughout than examples of T. hypsodus; nasals longer than in T. hypsodus but with approximately the same amount of retraction; premaxillre joined somewhat lower than in T. hypsodus; muzzle narrow; palate narrow.
MANDIBLE.-Smaller and lighter construction than examples of T. hypsodus.
DENTITION.-Superior and inferior dental series shorter than in T. hypsodus and premolars more crowded.
LIMBs.-Lighter than those of T. hypsodus.
M. S. Stevens et al. 2023Ticholeptus slightly smaller (M1-3 length = 40- 45 mm; P2-M3 length 75-79 mm; m1-3 length = 45-50 mm; p2-m3 length = 75-82 mm) and more lightly built than typical T. zygomaticus, with slightly longer nasals, narrow rostrum, and fusion of the premaxillae slightly lower than in other Ticholeptus.