Fereuungulata

Ferungulata (" wild beasts and ungulates") is a grandorder of placental mammals that groups together mirorder Ferae and clade Pan-Euungulata. It has existed in two guises, a traditional one based on morphological analysis and a revised one taking into account more recent molecular analyses. The Fereungulata is a sister group to the order Chiroptera (bats) and together they make clade Scrotifera.

General characteristics

According to a 2022 study by Anne E. Kort, members of grandorder Ferungulata, in addition to their genetic similarities, share common synapomorphy in the lumbar vertebrae (the S-shaped postzygapophysis). In extant ferungulate mammals, this is known only within members of order Artiodactyla. However, this feature is found also in many extinct members of Ferungulata, including hyaenodonts, oxyaenids, mesonychids, arctocyonids and the stem-relatives of perissodactyls (like '' Cambaytherium'').Anne E. Kort (2022.) "Bizarre Backbones: A Synapomorphy in the Lumbar Vertebrae for Ferungulata", in
"The Society of Vertebrate Paleontology 82nd annual meeting"
' This synapomorphy suggests that this may be basal to all Ferungulata and secondarily lost in modern members, like carnivorans and crown Perissodactyla. Previous study has shown that these S-shaped zygapophyses prevent torsion between vertebrae. As said in this study, it is possible this feature evolved in response to a need for stabilization in posterior spine as ribs became reduced. Also, in this and several other 2022 studies the extinct eutherians pantodonts, tillodonts and genus '' Deltatherium'' (family Deltatheriidae) are recognised as crown-group placental mammals,Thomas E. Williamson, Sarah L. Shelley, Gregory Funston, John R. Wible, Stephen L. Brusatte (2022.) "Triangular beast: New fossils shed light on ''Deltatherium'', an enigmatic early Paleocene mammal from New Mexico", in
"The Society of Vertebrate Paleontology 82nd annual meeting"
' who also possess S-shaped postzygapophysis like other members of Ferungulata.

Classification and phylogeny

History of phylogeny

The traditional Ferungulata was established by George Gaylord Simpson in 1945. It grouped together the extant orders Carnivora, Perissodactyla and Artiodactyla with the Tubulidentata and the superorder Paenungulata, as well as a number of orders known only from fossils.

Simpson established the grouping on the basis of morphological criteria, but this traditional understanding of Ferungulata has been challenged by a more recent classification, relying upon genetic criteria.Xue Lv, Jingyang Hu, Yiwen Hu, Yitian Li, Dongming Xu, Oliver A. Ryder, David M. Irwin, Li Yu (2021.
"Diverse phylogenomic datasets uncover a concordant scenario of laurasiatherian interordinal relationships"
Molecular Phylogenetics and Evolution, Volume 157 These studies separated his ungulate orders into two distinct placental groups, within Afrotheria and Laurasiatheria, respectively. The 'true' ungulates (mirorder Euungulata), Perissodactyla and Artiodactyla, are included in the revised group, along with the Carnivora, and with the addition of pangolins (order Pholidota), but the Tubulidentata and paenungulates are excluded. Although Simpson placed whales (Cetacea) in a separate cohort, recent evidence linking them to Artiodactyla would mean that they belong here as well. To reflect this difference, the revised clade is usually referred to as Fereungulata.

The karyotypes of ferungulates are highly conserved: "the fereungulatan ancestor chromosomes (n = 23 + X) ... differ from those of the antecedent scrotiferan ancestor by five rearrangements that occurred over 1 My (''citation excluded''). For the fereungulatan ancestor, we discovered four ancestral syntenies..."

Point coloration has been observed in a wide variety of ferungulates, including cats, foxes, horses, and dogs.

Taxonomy

See also

* Mammal classification

References

{{Taxonbar, from=Q5445608, from2=Q5444079

Mammal taxonomy