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Olsoniformes Temporal range: Late Carboniferous - Late Permian
Skeleton of Acheloma cumminsi
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Order:	†Temnospondyli
Superfamily:	†Dissorophoidea
Clade:	†Olsoniformes Anderson et al., 2008

Olsoniformes is an extinct clade of dissorophoid temnospondyls, including the families Dissorophidae and Trematopidae. Most members of the clade were highly adapted to a terrestrial lifestyle. The clade was named in 2008 and is defined as the least inclusive clade containing Dissorophus multicinctus (a dissorophid) and Acheloma cumminsi (a trematopid) but not Amphibamus grandiceps, Micromelerpeton credneri, or Apateon pedestris. Olsoniforms share various features such as a stout and low ilium and a thin cultriform process. The earliest-branching olsoniform is Palodromeus bairdi, from the Late Carboniferous of Ohio.

Trematopids are known from the Late Carboniferous and the Early Permian of Europe and across much of North America, while dissorophids are primarily found in Early Permian deposits in the central United States, extending into the Middle-Late Permian in Eurasia.

Below is a cladogram from Schoch (2018) showing the phylogenetic position of Olsoniformes within the Dissorophoidea:

References

1. ^ Jason S. Anderson; Amy C. Henrici; Stuart S. Sumida; Thomas Martens & David S. Berman (2008). "Georgenthalia clavinasica, A New Genus and Species of Dissorophoid Temnospondyl from the Early Permian of Germany, and the Relationships of the Family Amphibamidae". Journal of Vertebrate Paleontology. 28 (1): 61–75. doi:10.1671/0272-4634(2008)28[61:GCANGA]2.0.CO;2.
2. Schoch, Rainer, R.; Milner, Andrew, R. (2014). Sues, Hans-Dieter (ed.). Handbuch der Paläoherpetologie Part 3A2. Temnospondyli I. Stuttgart: Dr. Friedrich Pfeil Verlag. ISBN 9783931516260. OCLC 580976.{{cite book}}: CS1 maint: multiple names: authors list (link)
3. Schoch, Rainer R.; Henrici, Amy C.; Hook, Robert W. (2021). "A new dissorophoid temnospondyl from the Allegheny Group (late Carboniferous) of Five Points, Mahoning County, Ohio (USA)". Journal of Paleontology. 95 (3): 638–651. doi:10.1017/jpa.2020.101. ISSN 0022-3360.
4. Schoch, Rainer R. (2018-11-05). "The putative lissamphibian stem-group: phylogeny and evolution of the dissorophoid temnospondyls". Journal of Paleontology. 93 (1): 137–156. doi:10.1017/jpa.2018.67. ISSN 0022-3360.

v t e Dissorophoidea
Kingdom: Animalia Phylum: Chordata Clade: Tetrapodomorpha Order: Temnospondyli Tetrapodomorpha see Tetrapodomorpha Temnospondyli see Temnospondyli Dissorophoidea see below↓ Dissorophoidea
Dissorophoidea Stegops Micromelerpetontidae Branchierpeton Eimerisaurus Limnogyrinus Micromelerpeton Nyranerpeton Olsoniformes Palodromeus Trematopidae Acheloma Actiobates Anconastes Ecolsonia Fedexia Mattauschia Mordex Phonerpeton Rotaryus Tambachia Dissorophidae Anakamacops Arkanserpeton Aspidosaurus Astreptorhachis Iratusaurus Nooxobeia Platyhystrix Dissorophinae Broiliellus Diploseira? Dissorophus Eucacopinae Brevidorsum Cacops Conjunctio Kamacops Parioxys? Reiszerpeton Scapanops Zygosaurus Amphibamiformes Eoscopus Georgenthalia Gerobatrachus Kermitops Limnerpeton Nanobamus Platyrhinops Plemmyradytes Rubeostratilia Micropholidae Micropholis Pasawioops Tersomius Amphibamidae sensu stricto Amphibamus Doleserpeton Branchiosauridae Apateon Branchiosaurus Leptorophus Melanerpeton Milnererpeton Piasimotriton Schoenfelderpeton Tungussogyrinus Xerodromeus Lissamphibia? see Lissamphibia
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• Carboniferous temnospondyls
• Permian temnospondyls
• Fossil taxa described in 2008
• Olsoniforms
• Carboniferous animal stubs
• Permian animal stubs
• Temnospondyli stubs