Mammaliaformes ("mammalian forms") is a clade that contains the crown group mammals and their closest extinct relatives; the group radiated from earlier probainognathian cynodonts.[1] It is defined as the clade originating from the most recent common ancestor of Morganucodonta and the crown group mammals; the latter is the clade originating with the most recent common ancestor of extant Monotremata, Marsupialia, and Placentalia.[2] Besides Morganucodonta and the crown group mammals, Mammaliaformes includes Docodonta and Hadrocodium as well as the Triassic Tikitherium, the earliest known member of the group.[3][4]
Mammaliaformes is a term of phylogenetic nomenclature. In contrast, the assignment of organisms to Mammalia has traditionally been founded on traits and, on this basis, Mammalia is slightly more inclusive than Mammaliaformes. In particular, trait-based taxonomy generally includes Adelobasileus and Sinoconodon in Mammalia, though they fall outside the Mammaliaformes definition. These genera are included in the broader clade Mammaliamorpha, defined phylogenetically as the clade originating with the last common ancestor of Tritylodontidae and the crown group mammals.[2] This wider group includes some families that trait-based taxonomy does not include in Mammalia, in particular Tritylodontidae and Brasilodontidae.
Animals in the Mammaliaformes clade are often called mammaliaforms, without the e. Sometimes, the spelling mammaliforms is used. The origin of crown-group mammals extends back to the Jurassic, with extensive findings in the Late Jurassic outcrops of Portugal and China. The earliest confirmed specimens of fur are found in them, demonstrating that the ancestors of mammals had already developed fur.
^Abdala, F. (2007). "Redescription of Platycraniellus Elegans (Therapsida, Cynodontia) from the Lower Triassic of South Africa, and the cladistic relationships of eutheriodonts". Palaeontology. 53 (3): 591–618. Bibcode:2007Palgy..50..591A. doi:10.1111/j.1475-4983.2007.00646.x. S2CID 83999660.
^ abRowe, T. S. (1988). "Definition, diagnosis, and origin of Mammalia" (PDF). Journal of Vertebrate Paleontology. 8 (3): 241–264. Bibcode:1988JVPal...8..241R. doi:10.1080/02724634.1988.10011708.
^Cite error: The named reference LuoMartin was invoked but never defined (see the help page).
^Datta, P. M. (2005). "Earliest mammal with transversely expanded upper molar from the Late Triassic (Carnian) Tiki Formation, South Rewa Gondwana Basin, India". Journal of Vertebrate Paleontology. 25 (1): 200–207. doi:10.1671/0272-4634(2005)025[0200:EMWTEU]2.0.CO;2. S2CID 131236175.
mammals, Mammaliaformes includes Docodonta and Hadrocodium as well as the Triassic Tikitherium, the earliest known member of the group. Mammaliaformes is a...
in the Late Triassic. Mammaliaformes originated from probainognathian cynodonts during the Late Triassic. Early Mammaliaformes were small bodied insectivores...
Early Cretaceous age for Juramaia sinensis, in line with similar early mammaliaformes. A recent review of the Southern Hemisphere Mesozoic mammal fossil record...
Triassic period. The cynodont group Probainognathia, which includes Mammaliaformes (mammals and their closer ancestors), were the only synapsids to survive...
Haramiyida were not crown mammals, but were part of an earlier offshoot of mammaliaformes instead. It is also disputed whether the Late Triassic species are closely...
equivalently aged sediments in France and the Anoual Formation of Morocco. Mammaliaformes, including mammals, having originated from cynodonts at the end of the...
is a clade of cynodonts. It contains the clades Tritylodontidae and Mammaliaformes, as well as a few genera that do not belong to either of these groups...
latter even into the Cretaceous (Montirictus and Xenocretosuchus)—and Mammaliaformes, which includes the mammals. Below is a cladogram from Ruta, Botha-Brink...
The Cedar Mountain Formation is the name given to a distinctive sedimentary geologic formation in eastern Utah, spanning most of the early and mid-Cretaceous...
Jurassic. It was part of an explosive Middle Jurassic radiation of Mammaliaformes moving into diverse habitats and niches. Its discovery in 2006, along...
that it is a synapomorphy between them and mammaliaformes. They are omnipresent in non-placental mammaliaformes, though Megazostrodon and Erythrotherium...
Morganucodonta ("Glamorgan teeth") is an extinct order of basal Mammaliaformes, a group including crown-group mammals (Mammalia) and their close relatives...
Mammaliaformes reported from the Tendaguru Formation Genus Species Location Member Material Notes Images Allostaffia A. aenigmatica Quarry Ig Middle Dinosaur...
During the Late Triassic, some advanced cynodonts gave rise to the first Mammaliaformes. All this climatic change, however, resulted in a large die-out known...
therapsids include the cynodonts, the group that gave rise to mammals (Mammaliaformes) in the Late Triassic, around 225 million years ago. Of the non-mammalian...
Ivantsov, S. V.; Skutschas, P. P. (2020). "A New Finding of a Docodontan (Mammaliaformes, Docodonta) in the Lower Cretaceous of Western Siberia". Doklady Earth...
accommodate some related taxa falling outside the crown group, he defined the Mammaliaformes as comprising "the last common ancestor of Morganucodontidae and Mammalia...
Mammaliaformes reported from the Kitadani Formation Genus Species Location Stratigraphic position Material Notes Images Symmetrolestes S. parvus North...
akin to those of the modern platypus are found in most non-therian Mammaliaformes groups. Venom is much more common among other vertebrates; there are...
insectivores) Mammal classification Boreoeutheria Gondwanatheria – a clade of mammaliaformes named after supercontinent of Gondwana Waddell, Peter J.; Okada, Norihiro;...
presence of tarsal spurs akin to those of the platypus in many non-therian Mammaliaformes groups suggests that venom was an ancestral characteristic among mammals...
marsupials, or laid eggs like modern monotremes. Paleontology portal Mammaliaformes Cynodonts Cynognathus Evolution of mammals Li; et al. (2001). "A new...
Wu in 1994; to Mammalia by Kielan-Jaworowska et al. in 2004; and to Mammaliaformes by Luo et al. in 2001 and Bi et al. in 2014. Lucas, Spencer (2001)....
traversodontids), and the tiny, shrew-like, Tritheledontidae, related to the Mammaliaformes. The tritheledontids died out during the Jurassic, and the tritylodontids...
size evolution were lower in prozostrodontians ancestral to the first Mammaliaformes than in other lineages. Averianov & Voyta (2024) reinterpret fossil...
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