Kuehneotherium
| Kuehneotherium Temporal range: Late Triassic - Early Jurassic,
| |
|---|---|
| |
| Upper and lower molars of Kuehneotherium | |
Scientific classification 
| |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Chordata |
| Clade: | Synapsida |
| Clade: | Therapsida |
| Clade: | Cynodontia |
| Clade: | Mammaliaformes |
| Family: | †Kuehneotheriidae |
| Genus: | †Kuehneotherium D.M. Kermack et al., 1968 |
| Type species | |
| †Kuehneotherium praecursoris D.M. Kermack et al., 1968
| |
Kuehneotherium is an early mammaliaform genus that lived during the late Triassic period and is characterized by reversed-triangle pattern of molar cusps.[1] Although many fossils have been found, the fossils are limited to teeth, dental fragments, and mandible fragments. The genus includes Kuehneotherium praecursoris and all related species. It was first named and described by Doris M. Kermack, K. A. Kermack, and Frances Mussett in November 1967. The family Kuehneotheriidae and the genus Kuehneotherium were created to house the single species Kuehneotherium praecursoris. Modeling based upon a comparison of the Kuehneotherium jaw with other mammals indicates they were about the size of a modern-day shrew between 4 and 5.5 g at adulthood.
Kuehneotherium is thought to be an insectivore that could consume only soft-bodied insects such as moths. Their teeth were shaped for vertical shearing and could not crush harder prey. They lived alongside another early mammal, Morganucodon, which had teeth that could crush harder insects such as beetles. This distinction in diet shows that early mammals adapted to have a separate feeding niche so they would not compete for food.[2][3]
Species
Remains of Kuehneotherium praecursoris have been found in the Pontalun Quarry in a single fissure pocket in South Wales. The deposit found in limestone is from the Late Triassic. (Whiteside and Marshall 2008) Additional Kuehneotherium fossils have been found in rock formations of the Early Jurassic of Britain (Somerset), and the Late Triassic of France (Saint-Nicolas-de-Porte), Luxembourg, and Greenland; the Kuehneotherium specimens for Saint-Nicolas-de-Porte have been named K. stanislavi.[4]
Paleoenvironment
During the Late Triassic Period the supercontinent Pangaea was intact, allowing easy interchange and migration of mammals across the connected continents. This explains the wide distribution of Kuehneotherium fossils found throughout Greenland and Europe. When the continents began to rift apart during the Jurassic, shallow seas covered the British Isles, where Kuehneotherium was first found. Mammal remains were swept into limestone caves and fissures formed by the shallow seas and were preserved as fossils in clastic sediment.
The climate Kuehneotherium lived in was hot and dry during this part of the early Mesozoic. Conifer plants thrived and spread throughout Pangaea. As the continents rifted apart during the Early Jurassic the climate was more humid. Ferns, horsetails, cycads, and mosses were common in both the Triassic and Jurassic, however they were more prevalent in the more humid Jurassic Period.[5]
Phylogeny
The phylogenetic position for Kuehneotherium has been widely debated. Kuehneotherium was once classified as a therian mammal (the common ancestor of marsupials, placentals, and their descendants). However, additional fossils of basal mammals have been found that predate the Kuehneotherium on the geological timescale and the relationships of early mammals were re-evaluated. Kuehneotherium is now placed in the more basal clade called Holotheria. Kuehneotherium preacursoris is the earliest mammal categorized as holotherian. Holotheria includes species in which the main and accessory molar cusps are arranged in a triangle. Kuehneotherium’s place in Holotheria is considered unstable, as it is difficult to determine a species characteristics based upon only mandible and dental fragments.[6]
- Phylogeny (Zofia Kielan-Jaworowska et al., 2002)
| Mammaliaformes |
| ||||||||||||||||||||||||||||||
Significance to the evolution of mammalian dentition
Study of the initial development of molar cusp triangulation in Kuehneotherium preacursoris was key in the early understanding of the transition between triconodont and crown therian molars.
Kuehneotherium dentition shows a significant link between mammaliaform triconodont shaped teeth used for in a puncture-crushing pattern, to modern crown therian molars that chew vertically and chew horizontally.[6] Therian mammals such as marsupials and placentals shared a common ancestor that was characterized by an upper molar with three main cusps arranged in a triangle that fits into the lower molar that has a reversed triangle and basin-like heel. Later discovery of the earlier more basal mammal Woutersia, provided additional information on this dental transition.[7] Kuehneotherium, like other mammals had 2 sets of teeth during its life. It is speculated that they may have had up to 6 lower molars with the last molar being added to the back later in life. The evidence for this is that the post canine tooth row shifts backwards as the animal grew. They had 5-6 premolars; the first four premolars are single rooted. Anterior premolars would have been shed in late adulthood and not replaced. The lower jaw is a more basal morphology with a prominent postdentary groove where more developed postdentary bones would attach. The enamel microstructures of Kuehneotherium teeth were synapsid columnar enamel characterized by a pattern of columnar, prism-less structures.[8]
See also
References
- ^ Kermack, Doris M.; Kermack, K.A.; Mussett, Frances (1968). "The Welsh pantothere Kuehneotherium praecursoris". Journal of the Linnean Society of London, Zoology. 47 (312): 407–423. doi:10.1111/j.1096-3642.1968.tb00519.x.
- ^ Gill, Pam, M.D. Morganucodon – lower jaw of an early mammal, Animal Bytes 13 June 2013. Web. retrieved http://animalbytescambridge.wordpress.com/2013/06/05/morganucodon-lower-jaw-of-an-early-mammal/#comments
- ^ Gill, Pamela G.; Purnell, Mark A.; Crumpton, Nick; Brown, Kate Robson; Gostling, Neil J.; Stampanoni, M.; Rayfield, Emily J. (2014). "Dietary specializations and diversity in feeding ecology of the earliest stem mammals". Nature. 512 (7514): 303–305. Bibcode:2014Natur.512..303G. doi:10.1038/nature13622. hdl:2381/29192. PMID 25143112.
- ^ Debuysschere, Maxime (2016). "The Kuehneotheriidae (Mammaliaformes) from Saint-Nicolas-de-Port (Upper Triassic, France): a Systematic Review". Journal of Mammalian Evolution. 24 (2): 127–146. doi:10.1007/s10914-016-9335-z.
- ^ Benton, Michael J. (2005) "Vertebrate Palaeontology" pg. 138-139, 189-190, and 300-306
- ^ a b Luo, Zhe-Xi; Kielan-Jaworowska, Zofia; Cifelli, Richard L. (2002). "In quest for a phylogeny of Mesozoic mammals". Acta Palaeontologica Polonica. 47 (1): 1–78. S2CID 80715429.
- ^ Godefroit, Pascal; Sigogneau-Russell, Denise (1 January 1999). "Kuehneotheriids from Saint-Nicolas-de-Port (late Triassic of France)". Geologica Belgica. ProQuest 51112892.
- ^ Kielan-Jaworowska, Zofia; Cifelli, Richard L.; Luo, Zhe-Xi (2005). Mammals from the Age of Dinosaurs: Origins, Evolution, and Structure. Columbia University Press. pp. 361–362. ISBN 978-0-231-11918-4.
Further reading
- Fraser, N. C.; Walkden, G. M.; Stewart, V. (March 1985). "The first pre-Rhaetic therian mammal". Nature. 314 (6007): 161–163. doi:10.1038/314161a0. ProQuest 51337243.
- Gingerich, Philip D. (1977). "Patterns of evolution in the mammalian fossil record". Patterns of evolution, as illustrated by the fossil record. Elsevier. pp. 469–500. ISBN 978-0-08-086846-2.
{{cite book}}: External link in|chapterurl=|chapterurl=ignored (|chapter-url=suggested) (help) - Mills, J R E (September 2016). "Evolution of Mammalian Dental Structures". Proceedings of the Royal Society of Medicine. 65 (4): 392–396. doi:10.1177/003591577206500440. PMC 1644176. PMID 5063423.
- Kermack, K A (September 2016). "Evolution of Mammalian Dental Structures". Proceedings of the Royal Society of Medicine. 65 (4): 389–392. doi:10.1177/003591577206500439. PMC 1644161. PMID 5063422.
- Parrington, Francis Rex (January 1997). "A further account of the triasic mammals". Philosophical Transactions of the Royal Society of London. B, Biological Sciences. 282 (989): 177–204. doi:10.1098/rstb.1978.0012.
- Setoguchi, T.; Tsubamoto, T.; Hanamura, H.; Hachiya, K. (1999). "An early late Cretaceous mammal from Japan, with reconsideration of the Evolution of tribosphenic molars". Paleontological Research. 3 (1): 18–28.
