{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,20]],"date-time":"2026-09-20T19:11:51Z","timestamp":1789931511916,"version":"4.0.1"},"reference-count":45,"publisher":"The Royal Society","issue":"4","license":[{"start":{"date-parts":[[2020,4,1]],"date-time":"2020-04-01T00:00:00Z","timestamp":1585699200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2020,4,1]],"date-time":"2020-04-01T00:00:00Z","timestamp":1585699200000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004063","name":"Knut och Alice Wallenbergs Stiftelse","doi-asserted-by":"crossref","award":["Wallenberg Scholarship (not numbered)"],"award-info":[{"award-number":["Wallenberg Scholarship (not numbered)"]}],"id":[{"id":"10.13039\/501100004063","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["royalsocietypublishing.org"],"crossmark-restriction":true},"short-container-title":["R. Soc. open sci."],"published-print":{"date-parts":[[2020,4]]},"abstract":"<jats:p>A new genus and species of Devonian tetrapod,<jats:italic>Brittagnathus minutus<\/jats:italic>gen. et sp. nov., is described from a single complete right lower jaw ramus recovered from the<jats:italic>Acanthostega<\/jats:italic>mass-death deposit in the upper part of the Britta Dal Formation (upper Famennian) of Stensi\u00f6 Bjerg, Gauss Peninsula, East Greenland. Visualization by propagation phase contrast synchrotron microtomography allows a complete digital dissection of the specimen. With a total jaw ramus length of 44.8 mm,<jats:italic>Brittagnathus<\/jats:italic>is by far the smallest Devonian tetrapod described to date. It differs from all previously known Devonian tetrapods in having only a fang pair without a tooth row on the anterior coronoid and a large posterior process on the posterior coronoid. The presence of an incipient surangular crest and a concave prearticular margin to the adductor fossa together cause the fossa to face somewhat mesially, reminiscent of the condition in Carboniferous tetrapods. A phylogenetic analysis places<jats:italic>Brittagnathus<\/jats:italic>crownward to other Devonian tetrapods, adjacent to the Tournaisian genus<jats:italic>Pederpes<\/jats:italic>. Together with other recent discoveries, it suggests that diversification of \u2018Carboniferous-grade\u2019 tetrapods had already begun before the end of the Devonian and that the group was not greatly affected by the end-Devonian mass extinction.<\/jats:p>","DOI":"10.1098\/rsos.192117","type":"journal-article","created":{"date-parts":[[2020,4,7]],"date-time":"2020-04-07T23:05:17Z","timestamp":1586300717000},"page":"192117","update-policy":"https:\/\/doi.org\/10.1098\/crossmark-policy","source":"Crossref","is-referenced-by-count":19,"title":["The smallest known Devonian tetrapod shows unexpectedly derived features"],"prefix":"10.1098","volume":"7","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9054-2900","authenticated-orcid":true,"given":"Per E.","family":"Ahlberg","sequence":"first","affiliation":[{"name":"Department of Organismal Biology, Uppsala University, Norbyv\u00e4gen 18A, 752 36 Uppsala, Sweden"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0017-5831","authenticated-orcid":true,"given":"Jennifer A.","family":"Clack","sequence":"additional","affiliation":[{"name":"University Museum of Zoology Cambridge, Downing Street, Cambridge CB2 3EJ, UK"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"175","published-online":{"date-parts":[[2020,4,8]]},"reference":[{"key":"e_1_3_5_2_2","first-page":"699","article-title":"New material of the early tetrapod Acanthostega from the upper Devonian of East Greenland","volume":"31","author":"Clack JA","year":"1988","journal-title":"Palaeontology"},{"key":"e_1_3_5_3_2","doi-asserted-by":"publisher","DOI":"10.1038\/342425a0"},{"key":"e_1_3_5_4_2","doi-asserted-by":"crossref","first-page":"1","DOI":"10.7146\/moggeosci.v31i.140691","article-title":"Acanthostega gunnari, a Devonian tetrapod from Greenland: the snout, palate and ventral parts of the braincase","volume":"31","author":"Clack JA","year":"1994","journal-title":"Meddelelser om Gr\u00f8nland Geosci."},{"key":"e_1_3_5_5_2","doi-asserted-by":"publisher","DOI":"10.1038\/369392a0"},{"key":"e_1_3_5_6_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1096-3642.1998.tb02525.x"},{"key":"e_1_3_5_7_2","doi-asserted-by":"publisher","DOI":"10.1017\/S0263593300000304"},{"key":"e_1_3_5_8_2","doi-asserted-by":"publisher","DOI":"10.1017\/S0263593300000390"},{"key":"e_1_3_5_9_2","volume-title":"Gaining ground: the origin and evolution of tetrapods","author":"Clack JA","year":"2012","edition":"2"},{"key":"e_1_3_5_10_2","doi-asserted-by":"publisher","DOI":"10.1038\/347066a0"},{"key":"e_1_3_5_11_2","doi-asserted-by":"publisher","DOI":"10.1038\/352234a0"},{"key":"e_1_3_5_12_2","doi-asserted-by":"publisher","DOI":"10.1017\/S0263593300006787"},{"key":"e_1_3_5_13_2","doi-asserted-by":"publisher","DOI":"10.1017\/S0263593300002340"},{"key":"e_1_3_5_14_2","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0118882"},{"key":"e_1_3_5_15_2","doi-asserted-by":"publisher","DOI":"10.1111\/j.1475-4983.2011.01117.x"},{"key":"e_1_3_5_16_2","doi-asserted-by":"crossref","first-page":"4","DOI":"10.7146\/moggeosci.v43i.140286","article-title":"Localities, distribution and stratigraphical context of the Late Devonian tetrapods of East Greenland","volume":"43","author":"Blom H","year":"2005","journal-title":"Meddelelser om Gr\u00f8nland, Geosci."},{"key":"e_1_3_5_17_2","doi-asserted-by":"publisher","DOI":"10.1002\/spp2.1242"},{"key":"e_1_3_5_18_2","doi-asserted-by":"publisher","DOI":"10.1038\/nature22966"},{"key":"e_1_3_5_19_2","doi-asserted-by":"publisher","DOI":"10.1038\/s41559-016-0002"},{"key":"e_1_3_5_20_2","first-page":"55","article-title":"A partial lower jaw of a tetrapod from \u2018Romer's Gap\u2019","volume":"108","author":"Chen D","year":"2018","journal-title":"Earth Environ. 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