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Merycoidodon presidioensis

Mammalia - Merycoidodontidae

Taxonomy
Merycoidodon (Merycoidodon) presidioensis was named by Stevens and Stevens (1996). Its type specimen is TMM 40505-2, a partial skull (the anterior part of a skull and lower jaws), and it is a 3D body fossil.

It was recombined as Merycoidodon presidioensis by Stevens and Stevens (2007) and Stevens et al. (2023).

Synonymy list
YearName and author
1996Merycoidodon (Merycoidodon) presidioensis Stevens and Stevens p. 515 figs. Figures 2A, 3A; Tables 3-6; Appendix B
2007Merycoidodon presidioensis Stevens and Stevens p. 158
2023Merycoidodon presidioensis Stevens et al. p. 143

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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
subfamilyMerycoidodontinae
genusMerycoidodon
speciespresidioensis()

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.

†Merycoidodon presidioensis Stevens and Stevens 1996
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Diagnosis
ReferenceDiagnosis
M. S. Stevens and J. B. Stevens 1996The cranial characterization is the same as for the genus, as the most primitive known species. The Subnasal L. is 53% of the Nasal L., premolars are unreduced with a mean pl_P4tpl_M3 of 50% (Table 3), values for the APM3trM3 and APM3/Ht. M3 ratios are 0.98 (mean) and 1.80 (sole) respectively (Tables 4, 5), and TM3/Ht. M3 is 1.80 (sole; Table 6). M.presidioen-
sis differs from M. culbertsoni by a narrower, deeper, and more convex nasal profile, steeper premaxillae, longer face, a more anterior infraorbital foramen, slightly thinned enamel on the middle surfaces of the premolar-molar selenes, and a significantly larger size [Subnasal L., tooth row and tooth measurements, except APM3, Ht. M3s; 11 of 15 measurement categories available for comparison for M. presidioensis (Appendix B) lie within observed ranges of those of M. culbertsoni; exceptions: P1-M3, M1-M3, APM3, TM3] as known from a very small sample which does not include a measurable Sk. L.