Fig 1.
Maps showing the geographic position of the Teete locality (red dot).
Fig 2.
(a, b), Ornithischia indet. (c-e), and Eleutherodontidae indet. cf. Sineleutherus sp. (f, g). a, b, ZIN PH 1/246, in occlusal (a) and labial or lingual (b) views. c-e, ZIN PH 2/246, in occlusal (c), lingual (d), and mesial or distal (e) views. f, g, PIN 5614/4, left upper molariform tooth, in labial (f) and occlusal (g) views. Scale bars equal 1 mm.
Fig 3.
Photograph of the Teete microvertebrate locality (left) and its geological section (right).
Fig 4.
Khorotherium yakutensis gen. et sp. nov., PIN 5614/1, right maxilla fragment with the three last molariform teeth (holotype; a, b, SEM micrographs; a’, b’, explanatory drawings). Teete, Yakutia, Russia; Sangar Series, Lower Cretaceous. a, labial view. b, occlusal view. A, B, C, D, E, X, and Y–cusps of an upper molariform tooth. Scale bar equals 1 mm.
Fig 5.
Khorotherium yakutensis gen. et sp. nov., PIN 5614/2, left dentary fragment with the penultimate molariform tooth, a distal fragment of the antepenultimate molariform tooth, and alveoli for the ultimate and more anterior teeth (a-d, SEM micrographs; a’-d’, explanatory drawings). Teete, Yakutia, Russia; Sangar Series, Lower Cretaceous. a, b, penultimate molariform tooth in occlusal (a) and lingual (b) views. c, d, dentary fragment in occlusal (c) and lingual (d) views. Abbreviations: Mg, Meckel's groove; rg, replacement groove. a, b, bb, c, d, dd, e, and g–cusps of a lower molariform tooth. Scale bars equal 0.1 mm for a, b, and 1 mm for c, d.
Fig 6.
Sangarotherium aquilonium gen. et sp. nov., PIN 5614/3, left dentary fragment with roots of the antepenultimate molariform tooth, the penultimate molariform tooth, and the ultimate molariform tooth in crypt (holotype; a-c, SEM micrographs; d, light photograph; a’-d’, explanatory drawings). Teete, Yakutia, Russia; Sangar Series, Lower Cretaceous. a, penultimate molariform tooth in occlusal view. b-d, dentary fragment in occlusal (b), labial (c), and lingual (d) views. Abbreviations: cf, coronoid facet; mc, mandibular canal; mf, mandibular foramen; Mg, Meckel's groove. a, b, c, d, e–cusps of a lower molariform tooth. Scale bars equal 0.1 mm for a and 1 mm for b-d.