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Fig. 3 in Isolated theropod teeth associated with a sauropod skeleton from the Late Cretaceous Allen Formation of Río Negro, Patagonia, Argentina

Fig. 3. Abelisaurid tooth of Morphotype II (IIPG-09) from "Dino 1" site S 39°08'; W 67°40'), Paso Córdoba locality, 14 km southwest of the town of General Roca, Río Negro Province; Allen Formation (middle Campanian–early Maastrichtian, Upper Cretaceous); in labial (A1), lingual A2), mesial (A3), distal (A4), apical (A5), and basal (A6) views; detail of the crown apex (A7).

Fig. 1 in Isolated theropod teeth associated with a sauropod skeleton from the Late Cretaceous Allen Formation of Río Negro, Patagonia, Argentina

Fig. 1. Location maps of the study area within the Neuquén Basin (A, B). Geological map indicating the different units recognized in Paso Córdoba (Argentina), star marks collecting of specimens (C). Field photos of the excavation of specimens (D, E).

Fig. 8 in Isolated theropod teeth associated with a sauropod skeleton from the Late Cretaceous Allen Formation of Río Negro, Patagonia, Argentina

Fig. 8. One of the paleoecological interpretations of the Paso Córdoba site. Theropods scavenging the carcass of a sauropod. Artwork by Jorge González, San Salvador de Jujuy, Argentina.

Fig. 5 in Isolated theropod teeth associated with a sauropod skeleton from the Late Cretaceous Allen Formation of Río Negro, Patagonia, Argentina

Fig. 5. Strict consensus tree of two most parsimonious trees (CI = 0.198; RI = 0.457; L = 1314) recovered in the cladistic analysis of the dentition-based data matrix with constrained search and setting the three morphotypes as floating terminals.

Fig. 2 in Isolated theropod teeth associated with a sauropod skeleton from the Late Cretaceous Allen Formation of Río Negro, Patagonia, Argentina

Fig. 2. Abelisaurid tooth of Morphotype I (IIPG-02) from "Dino 1" site (S 39°08'; W 67°40'), Paso Córdoba locality, 14 km southwest of the town of General Roca, Río Negro Province; Allen Formation (middle Campanian–early Maastrichtian, Upper Cretaceous); in labial (A1), lingual (A2), mesial (A3), distal (A4), apical (A5), and basal (A6) views; detail of marginal undulations (A7); mesial (A8) and distal (A9) denticles at the apical three-fourths of the crown height; detail of the mesial denticles at the apical three-fourths of the crown height (A10). Abbreviations: cs, concave surfaces; mca, mesial carina; dca, distal carina; sps, spalled surface; ids, interdenticular sulcus; idsp; interdenticular space.

Fig. 10 in An enigmatic new archosauriform from the Carnian- Norian, Upper Triassic, Ischigualasto Formation of northwestern Argentina

Fig. 10. Strict consensus tree of the 1188 MPTs (A), and reduced strict consensus tree of the 1188 MPTs (B) showing the alternative phylogenetic positions for Incertovenator longicollum gen. et sp. nov. ("a") and the combined OTU for Trialestes romeri ("b"). Note that in the strict consensus trees the clade Aphanosauria is not exactly recovered as defined by Nesbitt et al. (2017) (Spondylosoma + Teleocrater + Dongosuchus + Yarasuchus) due to the multiple alternative phylogenetic positions of Incertovenator longicollum gen. et sp. nov. and Spondylosoma absconditum.

Fig. 11 in An enigmatic new archosauriform from the Carnian- Norian, Upper Triassic, Ischigualasto Formation of northwestern Argentina

Fig. 11. Reduced strict consensus tree of the 1188 MPTs depicting alternative most-parsimonious phylogenetic positions (solid black circles) and suboptimal alternative positions of one extra step and two extra steps for Incertovenator longicollum gen. et sp. nov.; "b" represents the alternative most-parsimonious positioins for Trialestes romeri (combined OTU). Schematic drawings of anterior cervical vertebrae in right lateral view of selected taxa with elongated necks: Tropidosuchus romeri (A; modified from Arcucci 1990), Teleocrater rhadinus NMT RB505 (B), Incertovenator longicollum gen. et sp. nov. PVSJ 397 (C), Gracilisuchus stipanicicorum PVL 4597 (D; modified from Lecuona et al. 2017), Xilousuchus sapingensis IVPP V6026 (E), Mandasuchus tanyauchen NHMUK PV R6792 (F), Trialestes romeri PVL 3889 (G). E–G are mirrored for comparison. Scale bars 10 mm.

Fig. 9 in An enigmatic new archosauriform from the Carnian- Norian, Upper Triassic, Ischigualasto Formation of northwestern Argentina

Fig. 9. Photographs (A1, A2) and interpretative drawings (A3, A4) of left ilium of the archosauriform Incertovenator longicollum gen. et sp. nov. (PVSJ 397) from Ischigualasto Formation (Carnian–Norian), Hoyada de Ischigualasto, Argentina; in lateral (A1, A3) and medial (A2, A4) views. Arrows indicate anterior direction.

Fig. 8 in An enigmatic new archosauriform from the Carnian- Norian, Upper Triassic, Ischigualasto Formation of northwestern Argentina

Fig. 8. Photograph (A1) and interpretative drawing (A2) of selected sacral (S1, S2) and caudal vertebrae (Ca1, Ca2) of the archosauriform Incertovenator longicollum gen. et sp. nov. (PVSJ 397) from Ischigualasto Formation (Carnian–Norian), Hoyada de Ischigualasto, Argentina; in right {?} view. Gray coloring represents bone fragments and sediment.

Fig. 6 in An enigmatic new archosauriform from the Carnian- Norian, Upper Triassic, Ischigualasto Formation of northwestern Argentina

Fig. 6. Photographs of selected dorsal vertebrae (D6–D8) of the archosauriform Incertovenator longicollum gen. et sp. nov. (PVSJ 397) from Ischigualasto Formation (Carnian–Norian), Hoyada de Ischigualasto, Argentina; in right (A1) and left (A2) lateral views. Arrows indicate anterior direction.

Fig. 4 in An enigmatic new archosauriform from the Carnian- Norian, Upper Triassic, Ischigualasto Formation of northwestern Argentina

Fig. 4. Photograph (A1) and interpretative drawing (A2) of articulated pair of anterior cervical vertebrae of the archosauriform Incertovenator longicollum gen. et sp. nov. (PVSJ 397) from Ischigualasto Formation (Carnian–Norian), Hoyada de Ischigualasto, Argentina; in right lateral view. Posterior view of neural spine detailed in inset (stippled lines). Grey coloring represents broken bones and other fragments. Arrow indicates anterior direction.

Fig. 3 in An enigmatic new archosauriform from the Carnian- Norian, Upper Triassic, Ischigualasto Formation of northwestern Argentina

Fig. 3. Photograph (A1) and interpretative drawing (A2) of isolated anterior cervical vertebra of the archosauriform Incertovenator longicollum gen. et sp. nov. (PVSJ 397) from Ischigualasto Formation (Carnian–Norian), Hoyada de Ischigualasto, Argentina; in right lateral view. Grey coloring represents broken bones and other fragments.Arrow indicates anterior direction.

Fig. 5 in An enigmatic new archosauriform from the Carnian- Norian, Upper Triassic, Ischigualasto Formation of northwestern Argentina

Fig. 5. Photograph (A1) and interpretative drawing (A2) of the articulated series of dorsal vertebrae (D6–D10) of the archosauriform Incertovenator longicollum gen. et sp. nov. (PVSJ 397) from Ischigualasto Formation (Carnian–Norian), Hoyada de Ischigualasto, Argentina; in right lateral view. Gray coloring represents broken bones and sediment. Arrow indicates anterior direction.

Fig. 7 in An enigmatic new archosauriform from the Carnian- Norian, Upper Triassic, Ischigualasto Formation of northwestern Argentina

Fig. 7. Photograph of articulated series of sacral vertebrae (S1, S2) and anterior caudal vertebrae (Ca1–Ca5) of the archosauriform Incertovenator longicollum gen. et sp. nov. (PVSJ 397) from Ischigualasto Formation (Carnian–Norian), Hoyada de Ischigualasto, Argentina; in right lateral view. Arrow indicates anterior direction.

Fig. 2 in An enigmatic new archosauriform from the Carnian- Norian, Upper Triassic, Ischigualasto Formation of northwestern Argentina

Fig. 2. Photographs (A1, A2) and interpretative drawings (A3, A4) of the axis, third cervical vertebra and third cervical rib of the archosauriform Incertovenator longicollum gen. et sp. nov. (PVSJ 397) from Ischigualasto Formation (Carnian–Norian), Hoyada de Ischigualasto, Argentina; in left (A1, A3) and right A2, A4) lateral views. Arrows indicate anterior direction.

Fig. 1 in An enigmatic new archosauriform from the Carnian- Norian, Upper Triassic, Ischigualasto Formation of northwestern Argentina

Fig. 1. Geographic and stratigraphic position of the holotype specimen of Incertovenator longicollum gen. et sp. nov. (PVSJ 397). A, B. Geological map of the Ischigualasto–Villa Unión Basin. Asterisk indicates the type locality. C. Stratigraphic section of the Ischigualasto Formation. Modified from Martínez 1994.

Fig. 7 in First palaeoscolecid from the Cambrian (Drumian, Miaolingian) Marjum Formation of western Utah, USA

Fig. 7. Palaeogeographic distribution of Cambrian palaeoscolecids in Laurentia. For each occurrence, the numbers in parentheses refer to the number of palaeoscolecid specimens known (left) and the number of species they represent (right). The Rosella Formation Lagerstätte is positioned between the Lagerstätten of the American Great Basin and those of the Canadian Rockies, because the Cassiar terrane was located near present-day Idaho in the Cambrian, and subsequently migrated more than 2000 km to the North (Pope and Sears 1997). Abbreviations: Fm., Formation; Sh., Shale. Background map adapted from Cocks and Torsvik (2011).

Fig. 5 in First palaeoscolecid from the Cambrian (Drumian, Miaolingian) Marjum Formation of western Utah, USA

Fig. 5. Scleritome of the palaeoscolecid Arrakiscolex aasei gen et sp. nov. from the Drumian, Cambrian Marjum Formation in the House Range of Utah, USA (Grey Marjum locality). A. SEM micrographs of paratype (KUMIP 314101). A1, dense and homogeneous distribution of the plates on the surfaces of annuli; A2, interannular region showing alternation between plate-free areas and plate-covered areas ("columns"; arrowheads). B. SEM micrographs of holotype (KUMIP 314100). B1, homogeneous distribution of the plates; B2, single plate, showing the swollen inner region surrounded by a raised marginal rim.

Fig. 3 in First palaeoscolecid from the Cambrian (Drumian, Miaolingian) Marjum Formation of western Utah, USA

Fig. 3. SEM micrograph and SEM-EDS elemental maps of the posterior region of KUMIP 204770 (Ottoia? sp.), from the Drumian, Cambrian Marjum Formation in the House Range of Utah, USA (Sponge Gully locality). A1, SEM micrograph of the analyzed area (posterior trunk region); A2–A6, SEM-EDS elemental maps of P, Ca, C, Fe, and Mg, respectively.

Fig. 4 in First palaeoscolecid from the Cambrian (Drumian, Miaolingian) Marjum Formation of western Utah, USA

Fig. 4. Palaeoscolecid Arrakiscolex aasei gen et sp. nov. from the Drumian, Cambrian Marjum Formation in the House Range of Utah, USA (Grey Marjum locality). A. Holotype (KUMIP 314100). A1, general view of counterpart with location of close-up; A2, detailed view of trunk annulation; A3, general view of part. B. Paratype (KUMIP 314101), general view, showing trunk annulation and location of SEM micrograph in Fig. 5A1 (dashed line rectangle, arrowheads point to the limits of poorly preserved part of the fossil).