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126 results for “Crocodylomorpha”
Figure 6 in A new species of Dyrosaurus (Crocodylomorpha, Dyrosauridae) from the early Eocene of Morocco: phylogenetic implications
Figure 6. Reconstruction of the skull and mandible of Dyrosaurus maghribensis sp. nov., Ypresian of the Oulad Abdoun Basin, Morocco, in lateral view.
Figure 5 in A new species of Dyrosaurus (Crocodylomorpha, Dyrosauridae) from the early Eocene of Morocco: phylogenetic implications
Figure 5. Reconstruction of the skull of Dyrosaurus maghribensis sp. nov., Ypresian of the Oulad Abdoun Basin, Morocco, in dorsal view. See Appendix 5, for explanation of abbreviations here and in Figures 6–17.
Figure 4 in A new species of Dyrosaurus (Crocodylomorpha, Dyrosauridae) from the early Eocene of Morocco: phylogenetic implications
Figure 4. Skull, cervical and dorsal vertebrae of Dyrosaurus maghribensis sp. nov., OCP DEK-GE 43, Ypresian of Daoui, in the Oulad Abdoun Basin, Morocco, in dorsal view.
Figure 2 in A new species of Dyrosaurus (Crocodylomorpha, Dyrosauridae) from the early Eocene of Morocco: phylogenetic implications
Figure 2. Dyrosaurus maghribensis sp. nov., Ypresian of Mera el Arech, in the Oulad Abdoun Basin, Morocco: A, skeleton of OCP DEK-GE 255, holotype; B, skeleton of OCP DEK-GE 252.
Figure 1 in A new species of Dyrosaurus (Crocodylomorpha, Dyrosauridae) from the early Eocene of Morocco: phylogenetic implications
Figure 1. Geographical position of the Oulad Abdoun and Algero-Tunisian Basins in which the two Dyrosaurus have been found. A, Geographical position of Morocco, Algeria, and Tunisia. B, Position of the Oulad Abdoun and Algero-Tunisian Basins on a simplified palaeogeographical reconstruction of the Basins during the early Eocene (Ypresian). Grey, sea; white, exposed land. [Modified from Furon, 1950; Arambourg, 1952; Sassi, 1974 (in Moody & Buffetaut, 1981); Herbig, 1986, 1991; Trappe, 1991; Meulenkamp et al., 2000.]
Figure 3 in A new species of Dyrosaurus (Crocodylomorpha, Dyrosauridae) from the early Eocene of Morocco: phylogenetic implications
Figure 3. Skull of Dyrosaurus maghribensis sp. nov., OCP DEK-GE 88, Ypresian of Daoui, Oulad Abdoun Basin, Morocco, in dorsolateral view.
FIGURE 8. Block 2 in A new early diverging thalattosuchian (Crocodylomorpha) from the Early Jurassic (Pliensbachian) of Dorset, U.K. and implications for the origin and evolution of the group
FIGURE 8. Block 2 containing four dorsal vertebrae, the right ulna, and dorsal ribs and gastralia of Turnersuchus hingleyae gen. et sp. nov. (LYMPH 2021/45).
FIGURE 7 in A new early diverging thalattosuchian (Crocodylomorpha) from the Early Jurassic (Pliensbachian) of Dorset, U.K. and implications for the origin and evolution of the group
FIGURE 7. Cervical and dorsal vertebrae of Turnersuchus hingleyae gen. et sp. nov. (LYMPH 2021/45). A, digital model of vertebral series of the last five cervical vertebrae with cervical ribs in right lateral view; B, line interpretation of same (without the ribs); C, line interpretation of the first cervical vertebra of the series in anterior view; D, line interpretation of same in right lateral view; E, line interpretation of same in ventral view; F, digital model of vertebral series of the first five dorsal vertebrae with ribs in right lateral view; G, line interpretation of same (without the ribs); H, line interpretation of the second dorsal vertebra of the series in anterior view; I, line interpretation of same in right lateral view; J, line interpretation of same in ventral view. Abbreviations: aas, anterior articular surface; cr, cervical rib; dr1, first dorsal rib; dv1, first dorsal vertebra; dv2, second dorsal vertebra; dv3, third dorsal vertebra; dia, diapophysis; lcr, last cervical rib; lcv, last cervical vertebra; nsp, neural spine; pap, parapophysis; poz, postzygapophysis; prz, prezygapophysis; vk, ventral keel.
FIGURE 9 in A new early diverging thalattosuchian (Crocodylomorpha) from the Early Jurassic (Pliensbachian) of Dorset, U.K. and implications for the origin and evolution of the group
FIGURE 9. Caudal vertebrae of Turnersuchus hingleyae gen. et sp. nov. (LYMPH 2021/45). A, block 5 containing caudal vertebrae from a relatively posterior position in series; B, block 4 containing one complete and one partial caudal vertebra from a relatively anterior position in the series; C, pair of likely caudal centra; D, second pair of likely caudal centra.
FIGURE 6 in A new early diverging thalattosuchian (Crocodylomorpha) from the Early Jurassic (Pliensbachian) of Dorset, U.K. and implications for the origin and evolution of the group
FIGURE 6. Mandibular fragments of Turnersuchus hingleyae gen. et sp. nov. (LYMPH 2021/45). A, right anterior dentary fragment in dorsal view; B, medial view of the same; C, posterior left dentary fragment in lateral view; D medial view of the same; E, posterior left mandibular fragment in lateral view. Abbreviations: an, angular; D1–D5, second through fifth dentary alveoli and/or teeth; den, dentary; dg, dentary groove, g cor, groove for articulation of anterior process of coronoid; mf, Meckelian fossa; t, posterior dentary teeth.
FIGURE 5 in A new early diverging thalattosuchian (Crocodylomorpha) from the Early Jurassic (Pliensbachian) of Dorset, U.K. and implications for the origin and evolution of the group
FIGURE 5. Photograph and line interpretation of the posterior region of left mandibular ramus of Turnersuchus hingleyae gen. et sp. nov. (LYMPH 2021/45) exposed in ventral view. Abbreviations: an, angular; art, articular; part, prearticular; san, surangular.
FIGURE 11 in A new early diverging thalattosuchian (Crocodylomorpha) from the Early Jurassic (Pliensbachian) of Dorset, U.K. and implications for the origin and evolution of the group
FIGURE 11. Phylogenetic placement of Turnersuchus hingleyae gen. et sp. nov. (in bold) with trees calibrated to stratigraphy. A, strict consensus of eight most parsimonious trees of 1774 steps (CI = 0.309; RI = 0.753) resulting from analysis based on the dataset of Wilberg et al. (2019); B, strict consensus of 165,888 most parsimonious trees of 1783 steps (CI = 0.403; RI = 0.834) resulting from analysis based on the dataset of Herrera et al. (2021).
FIGURE 12 in A new early diverging thalattosuchian (Crocodylomorpha) from the Early Jurassic (Pliensbachian) of Dorset, U.K. and implications for the origin and evolution of the group
FIGURE 12. Results of the Bayesian time-calibration analyses (95% HPD age ranges for each node indicated by horizontal bars). For visualization purposes, Crocodylia is omitted in both trees, even though representatives of the group were included in the analyses. A. time-scaled strict consensus resulting from analysis of the dataset based on Wilberg et al. (2019); B, time-scaled strict consensus resulting from analysis of the dataset based on Herrera et al. (2021) with the position of Eopneumatosuchus manually changed to fall within Protosuchidae.
FIGURE 2 in A new early diverging thalattosuchian (Crocodylomorpha) from the Early Jurassic (Pliensbachian) of Dorset, U.K. and implications for the origin and evolution of the group
FIGURE 2. Skull of Turnersuchus hingleyae gen. et sp. nov. (LYMPH 2021/45). A, digital model in dorsal view; B, line interpretation of same; C, digital model in ventral view; D, line interpretation of same. Abbreviations: bo, basioccipital; bsp, basisphenoid; ch g, choanal groove; fr, frontal; lef, lateral Eustachian foramen; lsp, laterosphenoid; mpf, median pharyngeal foramen; occ, occipital condyle; oto, otoccipital; pa, parietal; po, postorbital; pro, prootic; pt, pterygoid; qu, quadrate; qu mhc, quadrate medial hemicondyle; qu op, quadrate orbital process; sq, squamosal; tof, temporo-orbital foramen.
FIGURE 10 in A new early diverging thalattosuchian (Crocodylomorpha) from the Early Jurassic (Pliensbachian) of Dorset, U.K. and implications for the origin and evolution of the group
FIGURE 10. Appendicular bones of Turnersuchus hingleyae gen. et sp. nov. (LYMPH 2021/45). A, digital model of the right scapula and coracoid in lateral view; B, line interpretation of same; C, digital model of the proximal right humerus in medial view; D, right ulna in medial view; E, digital model of dorsal (caudal?) osteoderm in dorsal view. Abbreviations: co, coracoid; cf, coracoid foramen; dc, deltoid crest; dpc, deltopectoral crest; gl, glenoid fossa; hs, humeral shaft; ol, olecranon process; pt, pits; sc, scapula; scb, scapular blade; us, ulnar shaft.
FIGURE 1 in A new early diverging thalattosuchian (Crocodylomorpha) from the Early Jurassic (Pliensbachian) of Dorset, U.K. and implications for the origin and evolution of the group
FIGURE 1. Preserved material of Turnersuchus hingleyae gen. et sp. nov. (LYMPH 2021/45) including five main blocks and isolated elements.
FIGURE 4 in A new early diverging thalattosuchian (Crocodylomorpha) from the Early Jurassic (Pliensbachian) of Dorset, U.K. and implications for the origin and evolution of the group
FIGURE 4. Right retroarticular process of Turnersuchus hingleyae gen. et sp. nov. (LYMPH 2021/45). A, digital model and line interpretation in lateral view; B, digital model and line interpretation in medial view; C, digital model and line interpretation in dorsal view. Abbreviations: an, angular; art, articular; gf, glenoid fossa; p art, prearticular; san, surangular.
FIGURE 3 in A new early diverging thalattosuchian (Crocodylomorpha) from the Early Jurassic (Pliensbachian) of Dorset, U.K. and implications for the origin and evolution of the group
FIGURE 3. Skull of Turnersuchus hingleyae gen. et sp. nov. (LYMPH 2021/45). A, digital model in ventrolateral view; B, line interpretation of same; C, digital model in occipital view; D, line interpretation of same. Abbreviations: bo, basioccipital; bo t, basioccipital tuberosity; bsp, basisphenoid; ch g, choanal groove; cqc, cranioquadrate canal; fm, foramen magnum; fr, frontal; icf, internal carotid foramen; lsp, laterosphenoid; mpf, median pharyngeal foramen; occ, occipital condyle; oto, otoccipital; pa, parietal; po, postorbital; pro, prootic; pro p, prootic peg; pt, pterygoid; pts com, communication with paratympanic sinus; qu, quadrate; qu mhc, quadrate medial hemicondyle; qu op, quadrate orbital process; sq, squamosal; sq f, squamosal fossa; V, trigeminal foramen; vf, vagus foramen; XII, hypoglossal foramen.
Data from: Limited convergence in the postcranium of aquatic crocodylomorpha
<p>Thalattosuchia (Early Jurassic–Early Cretaceous) and Dyrosauridea (Late Cretaceous–Early Eocene) are crocodylomorph archosaurs which diversified in fluvial and marine environments and endured extinction events (i.e. Jurassic–Cretaceous boundary for Thalattosuchia; Cretaceous–Paleogene for Dyrosauridea). Their postcrania remain globally undervalued in anatomical descriptions and diagnoses, shrouding the locomotive adaptations that possibly underpinned their radiations and longevity. We thoroughly surveyed the postcranial morphology of Dyrosauridea and Thalattosuchia, recreated their girdles in three-dimensions using tens of high-precisions 3D scans, and analysed their shape using geometric morphometrics. Dyrosauridea and Thalattosuchia have clearly distinct postcrania, even when found within similar environments, suggesting the existence of clade-specific features limiting the strength of evolutionary convergence. Moreover, the range of postcranial morphologies evolved by dyrosaurids and thalattosuchians is large compared to extant crocodylians, making the latter unsatisfactory functional analogues for every group of extinct crocodylomorphs. Our work reveals the previously unsuspected potential of postcranial anatomy as an abundant source of phylogenetic and taxonomic characters to assess the relationships within Crocodylomorpha. Incorporation of postcranial anatomy therefore appears crucial to fully assess the ecology, disparity, and relationships of crocodylomorphs.</p>
Combined palaeohistological and isotopic inferences of thermometabolism in extinct Neosuchia, using Goniopholis and Dyrosaurus (Pseudosuchia: Crocodylomorpha) as case studies
<p>The evolution of thermometabolism in pseudosuchians (Late Triassic to the present) remains a partly unsolved issue: extant taxa (crocodilians) are ectothermic, but the clade was inferred ancestrally endothermic. Here we inferred the thermometabolic regime of two neosuchian groups, Goniopholididae (Early Jurassic to Late Cretaceous) and Dyrosauridae (Middle Cretaceous to Late Eocene), close relatives of extant crocodilians, in order to elucidate the evolutionary pattern across Metasuchia (Early Jurassic to the present), a clade comprising Neosuchia (Early Jurassic to the present) and Notosuchia (Middle Jurassic until Late Miocene). We propose a new integrative approach combining geochemical analyses to infer body temperature from the stable oxygen isotope composition of tooth phosphate and palaeohistology and phylogenetic comparative methods to infer resting metabolic rates (RMR) and red blood cells dimensions. †Dyrosaurus and †Goniopholis share with extant crocodilians similar lifestyles, body forms, bone tissue organization, body temperatures (Tb), metabolic rates and red blood cells dimensions. Consistently, we infer ectothermy for †Dyrosaurus and †Goniopholis with the parsimonious implication of neosuchians and metasuchians as being primitively ectothermic.</p>
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