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8 results for “Choristodera”
Data from: An Appalachian population of neochoristoderes (Diapsida: Choristodera) elucidated through fossil evidence and ecological niche modeling
<p>Four neochoristoderan vertebral centra are described from the latest Cretaceous of New Jersey. One specimen was recovered from the basal transgressive lag of the Navesink Formation in the area of Holmdel Park, New Jersey, and two others were recovered nearby and likely were derived from the same horizon. The fourth was recovered from the Marshalltown sequence in the vicinity of the Ellisdale Dinosaur Site. These vertebrae expand the geographic range of Late Cretaceous neochoristoderes in North America by over 2000 km further east, and represent the first neochoristoderan remains from the Atlantic coastal plain. To discern whether neochoristodere remains are to be expected in New Jersey, and elucidate why neochoristoderes are apparently so rare in Appalachia, we implemented ecological niche modeling to predict the range of suitable habitat for <i>Champsosaurus</i>, the only known genus of Late Cretaceous neochoristoderes. We found that in Appalachia, the ideal habitat of <i>Champsosaurus</i> likely existed slightly further north and west than the Atlantic coastal plain, and New Jersey is likely on or near the margin of this suitable habitat space. These results suggest that the occurrence of neochoristoderes in New Jersey is consistent with the habitat requirements of known Late Cretaceous neochoristoderes. These vertebrae therefore may represent the southern margin of a population of neochoristoderes that lived further inland, where latest Cretaceous sediments are not preserved. The continued recovery of material from Late Cretaceous deposits along the Atlantic coast, and review of existing collections, is encouraged to clarify the true distribution of neochoristoderes in Appalachia.</p>
Figure 6. A in The first report of Champsosaurus lindoei (Choristodera: Champsosauridae) from the Campanian of the United States: anatomical, phylogenetic, and palaeoecological significance
Figure 6. A, Strict consensus tree of four most parsimonious trees. Bremer supports are to the left of nodes and bootstrap values over 50% are to the right of nodes. B, Time-scaled 50% majority rule consensus tree of Neochoristodera. Taxon occurrence ranges are from Gao and Fox (1998) and Matsumoto et al. (2013), and divergence times are approximated from Brownstein (2022). Black boxes represent approximate occurrence ranges of each taxon. Node labels: A, Choristodera; B, 'Allochoristodera'; C, Monjurosuchidae; D, Hyphalosauridae; E, Neochoristodera; F, Champsosauridae. Abbreviations: As, Asia; Eu, Europe; NA, North America.
Figure 5. ROM 50000 in The first report of Champsosaurus lindoei (Choristodera: Champsosauridae) from the Campanian of the United States: anatomical, phylogenetic, and palaeoecological significance
Figure 5. ROM 50000 pelvic girdle and hindlimbs (A), right pes (B), and left pes (C). Abbreviations: as, astragalus; c, calcaneum; mt, metatarsal; t, tarsal; I1 through V2 indicate phalanx-digit position.
Figure 4. ROM 50000 in The first report of Champsosaurus lindoei (Choristodera: Champsosauridae) from the Campanian of the United States: anatomical, phylogenetic, and palaeoecological significance
Figure 4. ROM 50000 pectoral girdle (A), left forelimb (B), and integumentary impressions (C, D). Abbreviations: c, carpals; mc, metacarpal; ra, radius; ul, ulna; I1 through V3 indicate phalanx-digit position.
Figure 2 in The first report of Champsosaurus lindoei (Choristodera: Champsosauridae) from the Campanian of the United States: anatomical, phylogenetic, and palaeoecological significance
Figure 2. Image (A) and line drawing (B) of ROM 50000, from the Two Medicine Formation of Pondera County, Montana, USA. Specimen is preserved in ventral view, with the skull flipped to dorsal view for display. Abbreviations: c, caudal vertebra; ce, cervical; ch, chevron; cl, clavicle; co, coricoid; cr, caudal rib; d, dorsal vertebra; fe, femur; fi, fibula; gb, gastralial basket; gc?, potential gut contents; hu, humerus; ic, interclavicle; il, ilium; is, ischium; ma, manus; n, neural arch; pe, pes; pu, pubis; r, rib; s, sacral vertebra; sc, scapula; si, skin impressions; sk, skull; sr, sacral rib; ti, tibia.
Figure 1 in The first report of Champsosaurus lindoei (Choristodera: Champsosauridae) from the Campanian of the United States: anatomical, phylogenetic, and palaeoecological significance
Figure 1. Map of western Canada and the United States with Campanian Champsosaurus localities. Abbreviations: AB, Alberta; MT, Montana; ND, North Dakota; SD, South Dakota; SK, Saskatchewan; WY, Wyoming. Campanian and Maastrichtian holotype localities are labelled. Champsosaurus localities are entries in the Paleobiology Database (https://paleobiodb.org/#/). Map constructed using SimpleMappr (https://www.simplemappr.net/#tabs=0).
Figure 3 in The first report of Champsosaurus lindoei (Choristodera: Champsosauridae) from the Campanian of the United States: anatomical, phylogenetic, and palaeoecological significance
Figure 3. Image (A) and line drawing (B) of the skull of ROM 50000 in dorsal view. Abbreviations: bo, basioccipital; c, coronoid; d, dentary; ex, exoccipital; fr, frontal; ju, jugal; la, lacrimal; ma, maxilla; na, nasal; ne, neomorph; pa, parietal; pm, premaxilla; pof, postfrontal; por, postorbital; pqf, pterygoquadrate foramen; pr, prootic; prf, prefrontal; pt, pterygoid; q, quadrate; qj, quadratojugal; sa, surangular; so, supraoccipital; sq, squamosal.
Data from: An Appalachian population of neochoristoderes (Diapsida: Choristodera) elucidated through fossil evidence and ecological niche modeling
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