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FIG. 15 in Form and function of the pelvic girdle of Thalattosuchia and Dyrosauridae (Crocodyliformes)

FIG. 15. — Pelvic girdle of Thalattosuchus superciliosus (Blainville, 1853), NHMUK PV R 2054: A, lateral view; B, anterior view; C, ventral view; D, dorsal view. Target indicates anterior. Arrow points anteriorly. The right ilium, ischium and pubis are mirrored. Scale bar: 5 cm.

FIG. 1 in Form and function of the pelvic girdle of Thalattosuchia and Dyrosauridae (Crocodyliformes)

FIG. 1. — Schematic representation of a dyrosaurid, Cerrejonisuchus improcerus Hastings, Bloch, Cadena & Jaramillo, 2010, illustrating the conventions of bone orientation based on the presumed resting pose of said taxa. Anterior-Posterior: anterior relates to any part closer to the front of the animal than the rear, and posterior relates to any part closer to the rear of the animal than its front; Dorsal-Ventral: dorsal relates to any part closer to the back of the animal than to the abdomen, and ventral relates to any part closer to the abdominal side of the animal than to its vertebra;Medial-Lateral: medial relates to any part closer to the centre of the animal (i.e. the sagittal or bilateral plane) than to its flanks, and lateral relates to any part situated further away from the centre of the animal. Artwork by I.S.

FIG. 4. — 3D in Form and function of the pelvic girdle of Thalattosuchia and Dyrosauridae (Crocodyliformes)

FIG. 4. — 3D models of thalattosuchian pubes illustrating the difference between shaft and neck: A, B, right pubis of Suchodus durobrivensis Lydekker, 1890, NHMUK PV R 2618; C, D, right pubis of Thalattosuchus superciliosus (Blainville in Eudes-Deslongchamps & Blainville, 1852), NHMUK PV R 2054. Scale bars: 1 cm.

FIG. 20 in Form and function of the pelvic girdle of Thalattosuchia and Dyrosauridae (Crocodyliformes)

FIG. 20. — Pelvic and thoracic girdle elements of Cricosaurus albersdoerferi (Sachs, Young, Abel & Mallison, 2021) (Sachs et al. 2021), BMMS-BK 1-2 (holotype): A, pelvic girdle and hindlimb; B, thoracic girdle and forelimb. Modified from Sachs et al. (2021). Scale bars: 1 cm.

FIG. 5. — A in Form and function of the pelvic girdle of Thalattosuchia and Dyrosauridae (Crocodyliformes)

FIG. 5. — A metriorhynchoid schematic pelvic girdle in lateral view, based on 'Metriorhynchus' brachyrhynchus (Eudes-Deslongchamps, 1867) (NHMUK PV R 3804, holotype of 'Metriorhynchus' cultridens & NHMUK PV R 4763): A, pelvic girdle with associated vocabulary; B, C, reconstruction of the soft tissues, based on the work of Tsai & Holliday (2015). Scale bars: 1 cm.

FIG. 3 in Form and function of the pelvic girdle of Thalattosuchia and Dyrosauridae (Crocodyliformes)

FIG. 3. — Schematic left metriorhynchoid pelvic girdle in lateral view as laying on a flat surface (based on the reconstruction of 'Metriorhynchus' brachyrhynchus (Eudes-Deslongchamps, 1867) [specimen NHMUK PV R 3804, holotype of 'Metriorhynchus' cultridens & NHMUK PV R 4763] from below) illustrating the orientation of each bone: A, ilium; B, ischium; C, pubis. Scale bars: 1 cm.

FIG. 11 in Form and function of the pelvic girdle of Thalattosuchia and Dyrosauridae (Crocodyliformes)

FIG. 11. — Pelvic girdle elements of Pelagosaurus typus Bronn, 1841: A, B, BRLSI M.1417.1; A, left ilium in lateral view; B, left ilium in medial view; C, BRLSI M.1410, left ischium in lateral view; D, BRLSI M.1420, right pubis in posterior view. Cross indicates posterior. Arrow points anteriorly. Scale bars: 1 cm.

FIG. 21 in Form and function of the pelvic girdle of Thalattosuchia and Dyrosauridae (Crocodyliformes)

FIG. 21. — Pelvic and thoracic girdle elements of Cricosaurus bambergensis (Sachs, Young, Abel & Mallison, 2019) (Sachs et al. 2019), NKMB-P-Watt14/274 (holotype): A, overview of pelvic girdle and hindlimb; B, overview of thoracic girdle and forelimb; C, detail of pelvic girdle. Modified from Sachs et al. (2019). Scale bars: 1 cm.

FIG. 17 in Form and function of the pelvic girdle of Thalattosuchia and Dyrosauridae (Crocodyliformes)

FIG. 17. — Left ilium of Cricosaurus araucanensis (Gasparini & Dellapé, 1976), MLP 72-IV-7-1 (holotype) and right ischium and left pubis of MLP 72-II-27-6 (referred): A, left ilium of MLP 72-IV-7-1 in lateral view; B, left ischium of MLP 72-IV-7-1 in lateral view; C, left ischium of MLP 72-II-27-6 in medial view; D, left pubis of MLP 72-II-27-6 in anterior view. Arrow points anteriorly. Target indicates anterior. Pictures of Cricosaurus araucanensis (MLP 72-IV-7-1 and MLP 72-II-27-6), courtesy of Dr Yanina Herrera. Scale bars: 1 cm.

FIG. 7 in Form and function of the pelvic girdle of Thalattosuchia and Dyrosauridae (Crocodyliformes)

FIG. 7. — Snapshot of the pelvic girdle of the alligatoroid Palaeosuchus palpebrosus (Cuvier, 1807), RVC-JRH-PP1: A, in anterior view; B, in lateral view. Note the orientation of the pubes. Cross indicates posterior view. Arrow points anteriorly. CT scan courtesy of Professor John Hutchinson (see https://skfb.ly/6ByyV). Scale bars: 1 mm.

FIG. 13 in Form and function of the pelvic girdle of Thalattosuchia and Dyrosauridae (Crocodyliformes)

FIG. 13. — Pelvic girdle elements of Thalattosuchus superciliosus (Blainville, 1853), NHMUK PV R 2054: A, left ilium in lateral view; B, left ischium in lateral view; C, left pubis in lateral view; D, right pubis in anterior view; E, left pubis in anterior view; F, left ilium in medial view. Target indicates anterior. Arrow points anteriorly. Scale bars: 1 cm.

FIG. 6 in Form and function of the pelvic girdle of Thalattosuchia and Dyrosauridae (Crocodyliformes)

FIG. 6. — Reconstruction of the pelvic girdle in anterior view of Suchodus durobrivensis Lydekker, 1890, NHMUK PV R 2618: A, erroneous reconstruction based on the hypothesis of a short pubic symphysis (orange) similar to extant crocodylians; B, legitimate reconstruction based on the hypothesis of a long pubic symphysis (orange) as opposed to extant crocodylians; C, right ilium, second sacral, and left pubis in anterior view; D, snapshot in anterior view of the pelvic girdle of the alligatoroid Palaeosuchus palpebrosus Cuvier, 1807 (RVC-JRH-PP1, Fig. 7). Pubes are colored in black. CT scan courtesy of Professor John Hutchinson (see https://skfb.ly/6ByyV). Target indicates anterior. Scale bars: 1 cm.

FIG. 16 in Form and function of the pelvic girdle of Thalattosuchia and Dyrosauridae (Crocodyliformes)

FIG. 16. — Left ilium of Cricosaurus araucanensis (Gasparini & Dellapé, 1976), MLP 72-IV-7-1 (holotype): A, lateral view; B, medial view; C, dorsal view; D, anterior view. Arrow points anteriorly. Target indicates anterior. 3D models of Cricosaurus araucanensis (MLP 72-IV-7-1), courtesy of Dr Yanina Herrera. Scale bar: 1 cm.

FIG. 2. — 3D in Form and function of the pelvic girdle of Thalattosuchia and Dyrosauridae (Crocodyliformes)

FIG. 2. — 3D model of the skeleton of the holotype Congosaurus bequaerti Dollo, 1914 illustrating the conventions of bone orientation used in the following text: A, diagonally oriented to illustrate both the sagittal and coronal plane; B, in dorsal view to illustrate the coronal plane; C, in lateral view to illustrate the sagittal plane.

Fig. 9 in A new dyrosaurid crocodyliform from the Palaeocene of Morocco and a phylogenetic analysis of Dyrosauridae

Fig. 9. The strict consensus of the five most parsimonious trees of Dyrosauridae found based on a cladistic analysis of 13 taxa and 30 characters (Appendices 1 and 2), and historical biogeography. Tree length: 44 steps long (C.I. excluding uninformative characters: 0.66; R.I.: 0.85; R.C.: 0.62). Land area abbreviations in the circles indicate optimised transformations on the tree, with two alternative results in light grey, and dark grey. Abbreviations: C, Congo; NAf, North Africa; NAm, North America; WAf, West Africa.

Fig. 8 in A new dyrosaurid crocodyliform from the Palaeocene of Morocco and a phylogenetic analysis of Dyrosauridae

Fig. 8. Arambourgisuchus khouribgaensis gen. et sp. nov., Sidi Chenane, Morocco, late Palaeocene. Elements of mandibles. A. OCP DEK−GE 1200 in ventral view. B. OCP DEK−GE 269 in dorsal (B1) and lateral (B2) views. The arrows indicate the teeth that have been added recently, and which do not belong to the same specimen.

Fig. 5 in A new dyrosaurid crocodyliform from the Palaeocene of Morocco and a phylogenetic analysis of Dyrosauridae

Fig. 5. Arambourgisuchus khouribgaensis gen. et sp. nov., OCP DEK−GE 300, Sidi Chenane, Morocco, late Palaeocene, detail of the right posttemporal fenestra in posterior view. Photograph (A) and explanatory drawing of the same (B).

Fig. 4 in A new dyrosaurid crocodyliform from the Palaeocene of Morocco and a phylogenetic analysis of Dyrosauridae

Fig. 4. Arambourgisuchus khouribgaensis gen. et sp. nov., reconstruction of skull in dorsal (A) and ventral (B) views.

Fig. 6 in A new dyrosaurid crocodyliform from the Palaeocene of Morocco and a phylogenetic analysis of Dyrosauridae

Fig. 6. Arambourgisuchus khouribgaensis gen. et sp. nov., OCP DEKGE 300, Sidi Chenane, Morocco, late Palaeocene, skull in occipital view. Photograph (A) and explanatory drawing of the same (B).

Fig. 3 in A new dyrosaurid crocodyliform from the Palaeocene of Morocco and a phylogenetic analysis of Dyrosauridae

Fig. 3. Arambourgisuchus khouribgaensis gen. et sp. nov., OCP DEK−GE 18, Sidi Chenane, Morocco, late Palaeocene, skull and mandible in dorsal view. Photograph (A) and explanatory drawing of the same (B).