{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,3]],"date-time":"2026-09-03T00:28:17Z","timestamp":1788395297819,"version":"build-2803163510"},"reference-count":111,"publisher":"Public Library of Science (PLoS)","issue":"12","license":[{"start":{"date-parts":[[2020,12,9]],"date-time":"2020-12-09T00:00:00Z","timestamp":1607472000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:p>A new ophthalmosaurid ichthyosaur,<jats:italic>Thalassodraco etchesi<\/jats:italic>gen. et sp. nov., from the Upper Jurassic Kimmeridge Clay Formation of Dorset, UK is described. The specimen, a partial, articulated skull and anterior thorax in the Etches Collection of Kimmeridge, Dorset, is exceptionally well preserved on a slab of laminated coccolith limestone and has been expertly prepared. It comprises a near complete skull in articulation with associated anterior vertebral column and dorsal ribs, complete pectoral girdle, fully exposed left forelimb, and some elements of the right forelimb. Other elements present, including an ischiopubis are preserved on separate slabs. Presumed rapid burial of the anterior portion of the specimen in the coccolith substrate has preserved a number of ossified ligaments lying across the vertebral column and associated ribs as well as stomach contents and decayed internal organs. Aspects of the dentition, skull roof bones and the forelimb configuration distinguishes the new specimen from previously described Late Jurassic ichthyosaurs. Autopmorphies for<jats:italic>T<\/jats:italic>.<jats:italic>etchesi<\/jats:italic>include a large rounded protuberance on the supratemporal bone; a thin L-shaped lachrymal, with a steeply curved posterior border; ~ 70 teeth on the upper tooth row, and deep anterior dorsal ribs. A well resolved phylogenetic analysis shows<jats:italic>T<\/jats:italic>.<jats:italic>etchesi<\/jats:italic>as a member of a basal clade within Ophthalmosauridae comprising<jats:italic>Nannopterygius<\/jats:italic>,<jats:italic>Gengasaurus<\/jats:italic>,<jats:italic>Paraophthalmosaurus<\/jats:italic>and<jats:italic>Thalassodraco<\/jats:italic>. The new specimen adds to the diversity of the Ichthyopterygia of the Kimmeridge Clay Formation and emphasises the important contribution of amateur collectors in palaeontology.<\/jats:p>","DOI":"10.1371\/journal.pone.0241700","type":"journal-article","created":{"date-parts":[[2020,12,9]],"date-time":"2020-12-09T22:46:43Z","timestamp":1607554003000},"page":"e0241700","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":23,"title":["A new ophthalmosaurid ichthyosaur from the Upper Jurassic (Early Tithonian) Kimmeridge Clay of Dorset, UK, with implications for Late Jurassic ichthyosaur diversity"],"prefix":"10.1371","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-2674-9477","authenticated-orcid":true,"given":"Megan L.","family":"Jacobs","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David M.","family":"Martill","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2020,12,9]]},"reference":[{"issue":"2","key":"pone.0241700.ref001","doi-asserted-by":"crossref","first-page":"e88640","DOI":"10.1371\/journal.pone.0088640","article-title":"Terrestrial origin of viviparity in Mesozoic marine reptiles indicated by Early Triassic embryonic fossils","volume":"9","author":"R Motani","year":"2014","journal-title":"PLoS ONE"},{"key":"pone.0241700.ref002","unstructured":"McGowan C, Motani R. 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