taxonID	type	format	identifier	references	title	description	created	creator	contributor	publisher	audience	source	license	rightsHolder	datasetID
B37A87A33637FF9DFF41FE25FF2E0FE6.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/16972731/files/figure.png	https://doi.org/10.5281/zenodo.16972731	Fig. 2 Tavachelydra stevensoni, gen. et sp. nov., DMNH EPV.141854 (DMNH Loc.19258),holotype, external view of shell. A, photograph and B, interpretive line drawing of the carapace. C, photograph and D, interpretive line drawing of the plastron. Ab abdominal scale,An anal scale, Ce cervical scale, co costal,ent entoplastron, epi epiplastron, Fe femoral scale, Gu gular scale,Hu humeral scale, hyo hyoplastron, hypo hypoplastron, Ig intergular scale, Im inframarginal scale,Ma marginal scale,nu nuchal, per peripheral, Pl pleural scale, pn postneural, spy suprapygal, py pygal, Ve vertebral scale, xi xiphiplastron. Arabic numerals denote neurals	Fig. 2 Tavachelydra stevensoni, gen. et sp. nov., DMNH EPV.141854 (DMNH Loc.19258),holotype, external view of shell. A, photograph and B, interpretive line drawing of the carapace. C, photograph and D, interpretive line drawing of the plastron. Ab abdominal scale,An anal scale, Ce cervical scale, co costal,ent entoplastron, epi epiplastron, Fe femoral scale, Gu gular scale,Hu humeral scale, hyo hyoplastron, hypo hypoplastron, Ig intergular scale, Im inframarginal scale,Ma marginal scale,nu nuchal, per peripheral, Pl pleural scale, pn postneural, spy suprapygal, py pygal, Ve vertebral scale, xi xiphiplastron. Arabic numerals denote neurals	2025-08-05	Lyson, Tyler R.;Petermann, Holger;Bastien, Salvador;Toth, Natalie;Tamez-Galvan, Evan;Sherman, Sadie M.;Joyce, Walter G.		Zenodo	biologists	Lyson, Tyler R.;Petermann, Holger;Bastien, Salvador;Toth, Natalie;Tamez-Galvan, Evan;Sherman, Sadie M.;Joyce, Walter G.			
B37A87A33637FF9DFF41FE25FF2E0FE6.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/16972733/files/figure.png	https://doi.org/10.5281/zenodo.16972733	Fig. 3 Tavachelydra stevensoni, gen. et sp. nov., DMNH EPV.141854 (DMNH Loc.19258),holotype, internal view of shell. A, photograph and B, interpretive line drawing of the carapace. C, closeup photograph of the anterolateral region of the carapace highlighting the costiform process of nuchal superficially extending across peripherals I and II and ending in peripheral III. D, photograph and E, interpretive line drawing of the plastron. co costal,cos.pr. costiform process, d.r. dorsal rib, ent entoplastron, epi epiplastron, gr. groove, hyo hyoplastron, hyo.ins. hyoplastral insertion,hypo hypoplastron, il.s. iliac scar, nu nuchal, py pygal, r.ins. rib insertion, spy suprapygal,xi xiphiplastron	Fig. 3 Tavachelydra stevensoni, gen. et sp. nov., DMNH EPV.141854 (DMNH Loc.19258),holotype, internal view of shell. A, photograph and B, interpretive line drawing of the carapace. C, closeup photograph of the anterolateral region of the carapace highlighting the costiform process of nuchal superficially extending across peripherals I and II and ending in peripheral III. D, photograph and E, interpretive line drawing of the plastron. co costal,cos.pr. costiform process, d.r. dorsal rib, ent entoplastron, epi epiplastron, gr. groove, hyo hyoplastron, hyo.ins. hyoplastral insertion,hypo hypoplastron, il.s. iliac scar, nu nuchal, py pygal, r.ins. rib insertion, spy suprapygal,xi xiphiplastron	2025-08-05	Lyson, Tyler R.;Petermann, Holger;Bastien, Salvador;Toth, Natalie;Tamez-Galvan, Evan;Sherman, Sadie M.;Joyce, Walter G.		Zenodo	biologists	Lyson, Tyler R.;Petermann, Holger;Bastien, Salvador;Toth, Natalie;Tamez-Galvan, Evan;Sherman, Sadie M.;Joyce, Walter G.			
B37A87A33637FF9DFF41FE25FF2E0FE6.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/16972735/files/figure.png	https://doi.org/10.5281/zenodo.16972735	Fig. 4 Tavachelydra stevensoni, gen. et sp. nov., DMNH EPV.141854 (DMNH Loc.19258),holotype, photograph overlain by line drawing of the sulci and photographs of the lateral edges of peripherals showing anteroposterior changes in cross sectional shape of peripherals. Lateral photos of peripherals were taken on the rostral edge and are oriented with their medial side up and the dorsal side to the right	Fig. 4 Tavachelydra stevensoni, gen. et sp. nov., DMNH EPV.141854 (DMNH Loc.19258),holotype, photograph overlain by line drawing of the sulci and photographs of the lateral edges of peripherals showing anteroposterior changes in cross sectional shape of peripherals. Lateral photos of peripherals were taken on the rostral edge and are oriented with their medial side up and the dorsal side to the right	2025-08-05	Lyson, Tyler R.;Petermann, Holger;Bastien, Salvador;Toth, Natalie;Tamez-Galvan, Evan;Sherman, Sadie M.;Joyce, Walter G.		Zenodo	biologists	Lyson, Tyler R.;Petermann, Holger;Bastien, Salvador;Toth, Natalie;Tamez-Galvan, Evan;Sherman, Sadie M.;Joyce, Walter G.			
B37A87A33637FF9DFF41FE25FF2E0FE6.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/16972737/files/figure.png	https://doi.org/10.5281/zenodo.16972737	Fig. 5 Tavachelydra stevensoni, gen. et sp. nov., DMNH EPV.143100 (DMNH Loc. 20,053), referred carapace. A, photograph and B, interpretive line drawing in external view. C, photograph and D, interpretive line drawing in internal view. Ce cervical scale, co costal, cos.pr. costiform process, d.r. dorsal rib, gr. groove, Ma marginal scale, nu nuchal,per peripheral, Pl pleural scale, pn postneural,spy suprapygal, Ve vertebral scale, py pygal. Arabic numerals denote neurals	Fig. 5 Tavachelydra stevensoni, gen. et sp. nov., DMNH EPV.143100 (DMNH Loc. 20,053), referred carapace. A, photograph and B, interpretive line drawing in external view. C, photograph and D, interpretive line drawing in internal view. Ce cervical scale, co costal, cos.pr. costiform process, d.r. dorsal rib, gr. groove, Ma marginal scale, nu nuchal,per peripheral, Pl pleural scale, pn postneural,spy suprapygal, Ve vertebral scale, py pygal. Arabic numerals denote neurals	2025-08-05	Lyson, Tyler R.;Petermann, Holger;Bastien, Salvador;Toth, Natalie;Tamez-Galvan, Evan;Sherman, Sadie M.;Joyce, Walter G.		Zenodo	biologists	Lyson, Tyler R.;Petermann, Holger;Bastien, Salvador;Toth, Natalie;Tamez-Galvan, Evan;Sherman, Sadie M.;Joyce, Walter G.			
B37A87A33637FF9DFF41FE25FF2E0FE6.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/16972739/files/figure.png	https://doi.org/10.5281/zenodo.16972739	Fig. 6 Tavachelydra stevensoni, gen. et sp. nov., referred crania. DMNH EPV.134087 (DMNH Loc.7082), A, photograph (left) and line drawing (right) of in dorsal view, B, photograph (left) and line drawing (right) in ventral view, C, photograph (top) and line drawing (bottom) in right lateral view. DMNH. EPV.136265 (DMNH Loc. 18,852),photographs in D, ventral, E, dorsal, and F, right lateral views. bo basioccipital, fpp foramen palatinum posterius,fst foramen stapedio-temporale, mand mandible, mx maxilla, pal palatine,pmx premaxilla,ppf praepalatine foramen, pt pterygoid, qu quadrate,vo vomer	Fig. 6 Tavachelydra stevensoni, gen. et sp. nov., referred crania. DMNH EPV.134087 (DMNH Loc.7082), A, photograph (left) and line drawing (right) of in dorsal view, B, photograph (left) and line drawing (right) in ventral view, C, photograph (top) and line drawing (bottom) in right lateral view. DMNH. EPV.136265 (DMNH Loc. 18,852),photographs in D, ventral, E, dorsal, and F, right lateral views. bo basioccipital, fpp foramen palatinum posterius,fst foramen stapedio-temporale, mand mandible, mx maxilla, pal palatine,pmx premaxilla,ppf praepalatine foramen, pt pterygoid, qu quadrate,vo vomer	2025-08-05	Lyson, Tyler R.;Petermann, Holger;Bastien, Salvador;Toth, Natalie;Tamez-Galvan, Evan;Sherman, Sadie M.;Joyce, Walter G.		Zenodo	biologists	Lyson, Tyler R.;Petermann, Holger;Bastien, Salvador;Toth, Natalie;Tamez-Galvan, Evan;Sherman, Sadie M.;Joyce, Walter G.			
B37A87A33637FF9DFF41FE25FF2E0FE6.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/16972741/files/figure.png	https://doi.org/10.5281/zenodo.16972741	Fig. 7 Tavachelydra stevensoni, gen. et sp. nov., DMNH EPV.141854 (DMNH Loc.19258),holotype, pelvis.Photographs of entire pelvis in A, dorsal, B, ventral,and C, right lateral views. Photographs of the right ischium in D, ventral and E, dorsal views. Photographs of the right pubis in F, ventral and G, dorsal views.Photographs of the right ilium in H, posterior, I, medial, J, anterior,and K, lateral views. Photograph of the right sacral rib in L, ventral and M, dorsal views. ac acetabulum, il ilium, il.n. ilial notch, isch ischium, lat.isc.pro. lateral ischial process, lat.pu.pro. lateral pubic process,pu pubis, th.pr. thelial process	Fig. 7 Tavachelydra stevensoni, gen. et sp. nov., DMNH EPV.141854 (DMNH Loc.19258),holotype, pelvis.Photographs of entire pelvis in A, dorsal, B, ventral,and C, right lateral views. Photographs of the right ischium in D, ventral and E, dorsal views. Photographs of the right pubis in F, ventral and G, dorsal views.Photographs of the right ilium in H, posterior, I, medial, J, anterior,and K, lateral views. Photograph of the right sacral rib in L, ventral and M, dorsal views. ac acetabulum, il ilium, il.n. ilial notch, isch ischium, lat.isc.pro. lateral ischial process, lat.pu.pro. lateral pubic process,pu pubis, th.pr. thelial process	2025-08-05	Lyson, Tyler R.;Petermann, Holger;Bastien, Salvador;Toth, Natalie;Tamez-Galvan, Evan;Sherman, Sadie M.;Joyce, Walter G.		Zenodo	biologists	Lyson, Tyler R.;Petermann, Holger;Bastien, Salvador;Toth, Natalie;Tamez-Galvan, Evan;Sherman, Sadie M.;Joyce, Walter G.			
B37A87A33637FF9DFF41FE25FF2E0FE6.taxon	http://purl.org/dc/dcmitype/StillImage	image/png	https://zenodo.org/record/16972729/files/figure.png	https://doi.org/10.5281/zenodo.16972729	Fig. 1 Geography, chronostratigraphy, and biostratigraphy of the Corral Bluffs Study Area within the Denver Basin from which specimens of Tavachelydra stevensoni were collected. A, map of Late Cretaceous through Eocene sediments within the Denver Basin showing the location of the Corral Bluffs Study Area within Colorado Springs (highlighted by box and enlarged in part B) in the southwestern portion of the basin. B, high-resolution photogrammetric model of the eastern portion of the Corral Bluffs Study Area overlain on Google Earth with geographic locations of T.stevensoni denoted by red stars:1, DMNH EPV.141854/DMNH Loc.19258; 2, DMNH EPV.143100/DMNH Loc.20,053; 3, DMNH. EPV.134087/ DMNH Loc. 7082; 4, DMNH. EPV.136265/DMNH Loc. 18,852; 5, DMNH EPV.143200/DMNH Loc. 6284. C, age,magnetostratigraphic, lithostratigraphic, and biostratigraphic logs showing the stratigraphic placement of T.stevensoni localities (red stars; see numbers from B). Stratigraphy is tied to the Geomagnetic Polarity Time Scale (GPTS2012; Gradstein et al., 2012; Ogg, 2012) using remnant magnetization of the rocks at the Corral Bluffs Study Area, two CA-ID-TIMS U–Pb-dated volcanic ash beds (yellow star; two dated ash samples represent the same volcanic ash locality and thus only one yellow star), and the palynologically defined K/Pg boundary (italicized dates) (Fuentes et al., 2019; Lyson et al., 2019). The lithostratigraphic log is a composite and shows that the sequence is dominated by intercalated mudstone and sandstone,reflecting a loosely anastomosing fluvial environment (Lyson et al., 2019). Pollen biozones follow Nichols and Fleming (2002) and are defined by diversification of Momipites spp. (fossil juglandaceous pollen). North American Land Mammal‘ages’ (NALMA) follows Lyson et al. (2019) as defined by Lofgren et al. (2004). Ma, million years ago; K/Pg, Cretaceous-Paleogene boundary	Fig. 1 Geography, chronostratigraphy, and biostratigraphy of the Corral Bluffs Study Area within the Denver Basin from which specimens of Tavachelydra stevensoni were collected. A, map of Late Cretaceous through Eocene sediments within the Denver Basin showing the location of the Corral Bluffs Study Area within Colorado Springs (highlighted by box and enlarged in part B) in the southwestern portion of the basin. B, high-resolution photogrammetric model of the eastern portion of the Corral Bluffs Study Area overlain on Google Earth with geographic locations of T.stevensoni denoted by red stars:1, DMNH EPV.141854/DMNH Loc.19258; 2, DMNH EPV.143100/DMNH Loc.20,053; 3, DMNH. EPV.134087/ DMNH Loc. 7082; 4, DMNH. EPV.136265/DMNH Loc. 18,852; 5, DMNH EPV.143200/DMNH Loc. 6284. C, age,magnetostratigraphic, lithostratigraphic, and biostratigraphic logs showing the stratigraphic placement of T.stevensoni localities (red stars; see numbers from B). Stratigraphy is tied to the Geomagnetic Polarity Time Scale (GPTS2012; Gradstein et al., 2012; Ogg, 2012) using remnant magnetization of the rocks at the Corral Bluffs Study Area, two CA-ID-TIMS U–Pb-dated volcanic ash beds (yellow star; two dated ash samples represent the same volcanic ash locality and thus only one yellow star), and the palynologically defined K/Pg boundary (italicized dates) (Fuentes et al., 2019; Lyson et al., 2019). The lithostratigraphic log is a composite and shows that the sequence is dominated by intercalated mudstone and sandstone,reflecting a loosely anastomosing fluvial environment (Lyson et al., 2019). Pollen biozones follow Nichols and Fleming (2002) and are defined by diversification of Momipites spp. (fossil juglandaceous pollen). North American Land Mammal‘ages’ (NALMA) follows Lyson et al. (2019) as defined by Lofgren et al. (2004). Ma, million years ago; K/Pg, Cretaceous-Paleogene boundary	2025-08-05	Lyson, Tyler R.;Petermann, Holger;Bastien, Salvador;Toth, Natalie;Tamez-Galvan, Evan;Sherman, Sadie M.;Joyce, Walter G.		Zenodo	biologists	Lyson, Tyler R.;Petermann, Holger;Bastien, Salvador;Toth, Natalie;Tamez-Galvan, Evan;Sherman, Sadie M.;Joyce, Walter G.			
