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Figs 14-17 in Dental anomalies in Didelphis albiventris (Mammalia, Marsupialia, Didelphidae) from Argentina, Brazil and Uruguay

Figs 14-17. Dental anomalies in Didelphis albiventris Lund, 1840 and D. marsupialis Linnaeus, 1758: 14, MZUSP 2996; 15, MNHN 3963; 16, MACN 24163; 17, MZUSP 4745. White arrows indicate the anomaly. See teXt for details.

Figs 8-13 in Dental anomalies in Didelphis albiventris (Mammalia, Marsupialia, Didelphidae) from Argentina, Brazil and Uruguay

Figs 8-13. Dental anomalies in Didelphis albiventris Lund, 1840: 8, ZVC 1285; 9, CFA 2663; 10, CFA 10249; 11, MACN 24168; 12, MACN 32.184; 13, MACN 36.734. White arrows indicate the anomaly. See teXt for details.

Figs 2-7 in Dental anomalies in Didelphis albiventris (Mammalia, Marsupialia, Didelphidae) from Argentina, Brazil and Uruguay

Figs 2-7. Dental anomalies in Didelphis albiventris Lund, 1840: 2, CFA 3235; 3, MACN 36753; 4, MACN 24174; 5, MACN 25.23; 6, MNHN 2590; 7, MACN 49.49. White arrows indicate the anomaly. See teXt for details.

Fig. 1 in Dental anomalies in Didelphis albiventris (Mammalia, Marsupialia, Didelphidae) from Argentina, Brazil and Uruguay

Fig. 1. Map with distribution of the analyzed specimens of Didelphis albiventris Lund, 1840 (grey squares), and distribution of the specimens with dental anomalies (black circles).

Fig. 2 in Unusual environmental conditions preserve a Permian mesosaur-bearing Konservat-Lagerstätte from Uruguay

Fig. 2. Mesosaurid scapulocoracoid, FC−DPV 2493, part (A) and counterpart (B), from the Early Permian Mangrullo Formation (Northeastern Uruguay) preserved in a shale surface highly bioturbated by the trace fossil Chondrites.

Fig. 1 in Unusual environmental conditions preserve a Permian mesosaur-bearing Konservat-Lagerstätte from Uruguay

Fig. 1. Generalized stratigraphic section of the Early Permian Mangrullo Formation (Northeastern, Uruguay), showing the various sedimentary facies and their corresponding fossil associations, including the "mesosaur community". Colour codes from standard Munsell Chart. Abbreviations: C, conglomerate; S, silt; FS, fine sandstone.

Fig. 9 in Unusual environmental conditions preserve a Permian mesosaur-bearing Konservat-Lagerstätte from Uruguay

Fig. 9. Exceptional preservation of internal anatomy in Mesosaurus tenuidens (FC−DPV 2109) from the Early Permian Mangrullo Formation (Northeastern Uruguay). Photograph (A) and interpretive drawing (B) of the internal mould of articulated mandibular rami, showing well preserved mandibular nerves, probably the trigeminus ramus, running along the dentary tooth series (black arrow in B), and delicate blood vessels (grey arrow in B).

Fig. 6 in Unusual environmental conditions preserve a Permian mesosaur-bearing Konservat-Lagerstätte from Uruguay

Fig. 6. Gypsum crystals from the Early Permian Mangrullo Formation (Norteastern Uruguay). A. FC−DPV 2518, gypsum crystals surrounding a mesosaur skeleton. B. GMHR 0001, gypsum crystals associated with oil−shale deposits, with interpretive drawing of crystals in the left corner. C. GMHR 0002, impressions of the crystals found in non−bituminous shale. D. GMHR 0003, columnar gypsum crystals from bituminous shales.

Fig. 8 in Unusual environmental conditions preserve a Permian mesosaur-bearing Konservat-Lagerstätte from Uruguay

Fig. 8. Almost complete Mesosaurus tenuidens skull (FC−DPV 2061) from the Early Permian Mangrullo Formation (Northeastern Uruguay) preserved as an impression of the external surface of the roofing bones in original anatomical position. Photograph (A) and interpretive drawing (B). Most sutures can be reconstructed and the component bones are clearly delimited, a type of preservation rarely found in mesosaurids.

Fig. 5 in Unusual environmental conditions preserve a Permian mesosaur-bearing Konservat-Lagerstätte from Uruguay

Fig. 5. Mesosaurid palate (FC−DPV 2462) from the Early Permian Mangrullo Formation (Northeastern Uruguay), including palatine and vomer. Part (A) and counterpart (B). Note the oval area posterior to the choana, probably indicating the presence of a salt gland (see text for additional information). The white arrow marks the posterior boundary of the probable gland. Photographs (A1, B1), interpretive drawings (A2, B2).

Fig. 4 in Unusual environmental conditions preserve a Permian mesosaur-bearing Konservat-Lagerstätte from Uruguay

Fig. 4. Mesosaurid partial skulls from the Early Permian Mangrullo Formation (Northeastern, Uruguay) showing the position of the nariale obturatum foramen (nof). A. FC−DPV 2254, skull fragment showing the position of the nof related to the external naris and the delimiting bones. B. FC−DPV 2104, picture of a skull fragment showing the lacrimal duct emptying into the nof (white arrow on the picture). Photographs (A1, B1), interpretive drawings (A2, B2).

Fig. 12 in Unusual environmental conditions preserve a Permian mesosaur-bearing Konservat-Lagerstätte from Uruguay

Fig. 12. Partially articulated Mesosaurus tenuidens skeleton (FC−DPV 2156) from the Early Permian Mangrullo Formation (Northeastern Uruguay). A. General view of a fragment showing an internal mass of elements that are here interpreted as a gastric content. B. Close up view of the area delimited by the white rectangle in A, showing some of the identified elements (arrowheads point to small bones, probably from a very young mesosaur; arrows point at pygocephalomorph carapaces and abdominal segments). C. Another close up view of A, to show thoracic pygocephalomorph segments preserving part of the endofragmal skeleton (arrowhead) and the remains of a specimen that clearly shows still articulated thoracic and abdominal segments (arrow).

Fig. 11 in Unusual environmental conditions preserve a Permian mesosaur-bearing Konservat-Lagerstätte from Uruguay

Fig. 11. Almost complete pygocephalomorph specimens from the Early Permian Mangrullo Formation (Northeastern Uruguay). A. MGT 1092, a complete individual in ventral view, showing well preserved appendages. B. FC−DPI 3306, two small, probably juvenile individuals lie joined to the large carapace of an adult individual.

Fig. 7 in Unusual environmental conditions preserve a Permian mesosaur-bearing Konservat-Lagerstätte from Uruguay

Fig. 7. Carbonization and impressions of filamentous algal mats found in the oil−shale facies of the Early Permian Mangrullo Formation (Northeastern Uruguay). A. GMHR 0004. B. GMHR 0005.

Fig. 10 in Unusual environmental conditions preserve a Permian mesosaur-bearing Konservat-Lagerstätte from Uruguay

Fig. 10. Possible copula of pygocephalomorph crustaceans (FC−DPI 4468) from the Early Permian Mangrullo Formation (Northeastern Uruguay). Part (A) and counterpart (B), showing the position of the individuals with respect to each other. Photographs (A1, B1) and interpretive drawings (A2, B2).

Fig. 1 in Diet composition and feeding habits of the eyespot skate, Atlantoraja cyclophora (Elasmobranchii: Arhynchobatidae), off Uruguay and northern Argentina

Fig. 1. Study area showing the location of trawl stations (black dots) and cells of the fishing grid (black rectangles) where individuals of Atlantoraja cyclophora were captured off North Argentina and Uruguay.

Fig. 4 in Diet composition and feeding habits of the eyespot skate, Atlantoraja cyclophora (Elasmobranchii: Arhynchobatidae), off Uruguay and northern Argentina

Fig. 4. Mean number of shrimps and teleosts consumed for Atlantoraja cyclophora from off Uruguay and northern Argentina by season and region, respectively.

Fig. 3 in Diet composition and feeding habits of the eyespot skate, Atlantoraja cyclophora (Elasmobranchii: Arhynchobatidae), off Uruguay and northern Argentina

Fig. 3. Changes in consumption of different prey with body size, maturity stage, season and region of Atlantoraja cyclophora from off Uruguay and northern Argentina estimated by generalized linear models for number of shrimps, crabs and teleosts. In shrimps: warm season with solid lines and open circles; cold season with dashed lines and solid circles. In teleosts: north region with solid lines and open circles; south region with dashed lines and solid circles.

Fig. 2 in Diet composition and feeding habits of the eyespot skate, Atlantoraja cyclophora (Elasmobranchii: Arhynchobatidae), off Uruguay and northern Argentina

Fig. 2. Cumulative mean Shannon diversity index as a function of sample size for prey of Atlantoraja cyclophora from off Uruguay and northern Argentina. Dashed lines indicate standard deviation.

Fig. 5 in Diet composition and feeding habits of the eyespot skate, Atlantoraja cyclophora (Elasmobranchii: Arhynchobatidae), off Uruguay and northern Argentina

Fig. 5. Quantile regressions of carapace width (CW) of crabs, cephalothorax length (CL) of shrimps and total length (TL) of teleosts and total length of Atlantoraja cyclophora. The solid, dashed and dotted lines are 5%, 50% and 95% quantile regressions, respectively.