Equus conversidens

[RSN]

Equus conversidens

The ancestor of Equus conversidens was Equus scotti

Age range

Equus conversidens existed from about 1 Ma to 0 Ma

Taxonomic history

Equus conversidens was named by Owen (1869); it was synonymized with Equus tau by Cope (1884) and Miller (1976); it was revalidated by Gidley (1901), Skinner (1942) and Hibbard (1955); it was reassigned to Asinus conversidens by Quinn (1957); it was revalidated by Hibbard and Taylor (1960), Dalquest (1964), Dalquest and Hughes (1965) and Kurten and Anderson (1980); it was synonymized with Equus alaskae by Harris (1993)

Equus tau was named by Owen (1870); it was synonymized with Equus conversidens by Hibbard (1955) and Dalquest and Hughes (1965); it was revalidated by Kurten and Anderson (1980); it was synonymized with Equus francisci by Harris (1993); it was considered a nomen dubium by Hulbert (1995b)

Equus barcenaei was named by Cope (1884); it was synonymized with Equus tau by Gidley (1901), Hay (1902) and Trouessart (1905); it was revalidated by Hay (1924) and Hay (1930); it was synonymized with Equus conversidens by Hibbard (1955) and Dalquest and Hughes (1965)

Equus semiplicatus was named by Cope (1893); it was synonymized with Equus intermedius by Matthew (1903); it was synonymized with Equus conversidens by Kurten and Anderson (1980); it was considered a nomen dubium by Dalquest and G Schultz (1992) and Hulbert (1995b)

Equus littoralis was named by Hay (1913); it was synonymized with Equus conversidens by Hibbard (1955), Hibbard and Taylor (1960) and Dalquest and Hughes (1965); it was reassigned to Onager littoralis by Quinn (1957); it was synonymized with Equus tau by Kurten and Anderson (1980); it was considered a nomen dubium by Hulbert (1995b)

Equus francisci was named by Hay (1915); it was reassigned to Asinus francisci by Quinn (1955) and Hibbard (1958); it was synonymized with Equus conversidens by Hay (1915), Hibbard (1939), Hibbard and Taylor (1960) and Dalquest and Hughes (1965); it was revalidated by Lundelius and Stevens (1970); it was synonymized with Equus tau by Kurten and Anderson (1980); it was revalidated by Lundelius (1984), Harris (1993) and Hulbert (1995b)

Equus achates was named by Hay and Cook (1930); it was synonymized with Equus conversidens by Quinn (1957) and Dalquest and Hughes (1965); it was synonymized with Equus tau by Kurten and Anderson (1980); it was synonymized with Equus francisci by Hulbert (1995b)

Onager zoyatalis was named by Mooser (1959); it was synonymized with Equus conversidens by Mooser and Dalquest (1975); it was synonymized with Equus francisci by Lundelius and Stevens (1970) and Winans (1989)

Source:
species.wikipedia.org/wiki/Equus_conversidens

[Melanie]

Extinction date most likely older than 10.000 BC

www.adias-uae.com/mleisa.html

[surroundx]

Waters, Michael R., Stafford, Thomas W. Jnr., Kooyman, Brian and Hills, L. V. (2015). Late Pleistocene horse and camel hunting at the southern margin of the ice-free corridor: Reassessing the age of Wally’s Beach, Canada. PNAS 112(14): 4263-4267.

[surroundx]

Churcher, C. S. (2019). Pleistocene Mammals From Extinction Cave, Belize. Canadian Journal of Earth Sciences. doi: doi.org/10.1139/cjes-2018-0178 [Abstract]

[Sebbe]

Population dynamics of Equus conversidens (Perissodactyla, Equidae) from the late Pleistocene of Hidalgo (central Mexico): Comparison with extant and fossil equid populations.

The Mexican horse Equus conversidens is a representative member of the Quaternary North American megafauna. Systematics, phylogeny, and stable isotope ecology of this species are known in some detail, although information regarding population ecology is unexplored. Numerous fossil remains (isolated teeth, mandibles, skulls, and postcranial elements) of this horse have been collected from Pleistocene deposits that outcrop at southeastern Hidalgo, central Mexico. The available dental sample is suitable for recovering some aspects of its population dynamics. Our study compares life history traits of cohorts of E. conversidens from the state of Hidalgo to extant and Pleistocene species of equids from North America (United States and Canada), Europe (France), and Africa (Rwanda, Namibia). Life tables and age-structured models allow us to describe demographic parameters and mortality patterns. We highlight that E. conversidens was a typical K-strategist with high probability of surviving to adulthood with asymptotic growth rate (λ = 1.05) indicating a population close to balance. Considering the mammalian associations from different habitats in southeastern Hidalgo and the flexible diet of E. conversidens, we suggest that ambush (Panthera atrox) and cursorial predators (Canis dirus) played a major role in the prime-dominated mortality pattern of this species. The presence of a woodland-grassland ecosystem that sustained a high diversity of herbivores and the occurrence of large-sized predators suggest that the population dynamics were regulated by resource availability and selective predation, as it occurs in populations of the extant plains zebra, E. quagga.

www.sciencedirect.com/science/article/abs/pii/S089598112030643X