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617 results for “Early Jurassic”
Fig. 3. Early Jurassic gastropods from Lomas Occidentales fossil locality. A–D in New Early Jurassic gastropods from west-central Patagonia, Argentina
Fig. 3. Early Jurassic gastropods from Lomas Occidentales fossil locality. A–D. Pseudomelania feruglioi sp. nov. A. MPEF−PI 4090, paratype, adult teleoconch in lateral views (A1, A2). B. MPEF−PI 4091, paratype, adult teleoconch in lateral view. C. MPEF−PI 4096, juvenile teleoconch in lateral view. D. MPEF−PI 4089, paratype, adult teleoconch in apertural views (D1, D2). E. Pseudomelania sp. adult teleoconch in lateral views (E1, E2), basal views showing ornament details (E3, E4). F, G. Anulifera chubutensis sp. nov. F. SEGEMAR 25000 (MPEF−PI 4107), holotype, teleoconch in lateral (F1) and apertural (F2) views. G. SEGEMAR 25001 (MPEF−PI 4108), fragmentary teleoconch in lateral views (G1, G2). H. Globularia aff. catanlilensis (Weaver, 1931). MPEF−PI 4110, teleoconch in lateral (H1) and apertural (H2) views. Scale bars: A–E 3 mm, F–H, 10 mm.
Fig. 4 in New Early Jurassic gastropods from west-central Patagonia, Argentina
Fig. 4. Early Jurassic gastropods from Lomas Occidentales and Cerro La Trampa fossiliferous localities. A–C. Globularia cf. catanlilensis (Weaver, 1931). A. MPEF−PI 4112; teleoconch in lateral (A1, A2) and apertural (A3) views. B. MPEF−PI 4114; teleoconch in lateral (B1, B2) and latero−apical (B3) views. C. MPEF−PI 4116, teleoconch in lateral views (C1, C2). D. Globularia sp. MPEF−PI 4119; teleoconch in lateral (D1) and apertural (D2) views. E. Naricopsina? sp.; MPEF−PI 3560, teleoconch in latero−apical views (E1, E2). F. Nerinea? sp. 1. MPEF−PI 4123, fragmentary teleoconch in lateral views (F1, F2). G–I. Nerinea? sp. 2. G. MPEF−PI 4124, fragmentary teleoconch in lateral view. H. MPEF−PI 4125, fragmentary teleoconch in lateral view. I. MPEF−PI 4126, fragment of last teleoconch whorl in lateral view. Scale bars: A–D 10 mm, E–I 3 mm.
Fig. 2 in New Early Jurassic gastropods from west-central Patagonia, Argentina
Fig. 2. Early Jurassic gastropods from Lomas Occidentales and Cerro La Trampa fossiliferous localities. A. Lithotrochus humboldtii (von Buch, 1839), MPEF−PI 4127; teleoconch in lateral (A1, A2), latero−apical (A3), and apertural (A4) views. B. Lithotrochus cf. rothi Damborenea and Ferrari, 2008, MPEF−PI 3581; teleoconch in lateral (B1) and apertural (B2) views; apertural detail (B3); teleoconch in basal and apertural view (B4). C, D. Trochidae gen. et sp. indet. 1. C. MPEF−PI 4120, teleoconch in lateral views (C1, C2). D. MPEF−PI 4121, teleoconch in lateral view. E. Trochidae? gen. et sp. indet. 2., MPEF−PI 4122, teleoconch in lateral view. F–I. Pseudomelania feruglioi sp. nov. F. MPEF−PI 4155, holotype, juvenile teleoconch in apertural (F1) and oblique apertural (F2) views. G. MPEF−PI 4087, paratype, juvenile teleoconch in lateral view. H. MPEF−PI 4101, adult teleoconch in lateral view. I. MPEF−PI 4098, juvenile teleoconch in lateral view. Scale bars: A–E 10 mm, F–I 3 mm.
Fig. 1 in Crural bases position as a structural criterion for supraspecific diagnosis of Early Jurassic zeilleriid brachiopods
Fig. 1. Selected specimens of the zeilleriid brachiopods in dorsal (A –K), lateral (A –K), and anterior (A –K) views. A, E–H. Pliensbachian, Eastern 1 1 2 2 3 3 Subbetic (South-East Spain). A. Securina oxygonia (Uhlig, 1879), DCTMA-UA I-XII-8-2. E. Bakonyithyris gastaldii (Parona, 1880), JdC O-VI-SE-3-2. F. Zeilleria aff. venusta (Uhlig, 1889), JdC O-IV-SE-4-8. G. Zeilleria mutabilis (Oppel, 1861), JdC I-XI-17-10. H. Zeilleria batilla (Geyer, 1889), JdC O-VI-SE-Ba-4. B–D. Upper Sinemurian–Lower Pliensbachian, Eastern Subbetic (South-East Spain). B. Securina securiformis (Gemmellaro, 1874), DCTMA-UA SPel-Bol-1-SSe-2. C. Securina plicata (Geyer, 1889), DCTMA-UA SF-1-M1-SP-21. D. Securina partschi (Oppel, 1861). DCTMA-UA SPel-Bol-Ca-SPa-2. I. Neozeilleria anglica (Oppel, 1856), DPUCM Fz.148.1, Lower Aalenian, Iberian Range (North-East Spain). J. Plesiothyris verneuili (Deslongchamps, 1863) DPUCM P.Ve-Cr-1, Pliensbachian, Iberian Range (North-East Spain). K. Aulacothyris resupinata (Sowerby, 1816), DPUCM 1-Ar.52, Lower Toarcian, Iberian Range (North-East Spain).
Fig. 2 in Crural bases position as a structural criterion for supraspecific diagnosis of Early Jurassic zeilleriid brachiopods
Fig. 2. Synthetic scheme of the crural bases position patterns observed in the Zeilleriidae genera analysed in this paper. A. Zeilleria-type. B. Bakonyithyris-type. C. Securina-type.
Fig. 4 in New Late Jurassic symmetrical hermit crabs from the southern Polish Uplands and early paguroid diversification
Fig. 4. Schematic dorsal carapace views, with the position of the massetic (green), keraial (purple), and lateral branchial (orange) regions in Paguridae (A, B), Diogenidae (C, D), Pylojacqueidae (E), Parapaguridae (F), and Parapylochelidae (G–K).
Fig. 3 in New Late Jurassic symmetrical hermit crabs from the southern Polish Uplands and early paguroid diversification
Fig. 3. Schematic dorsal views of shields of Late Jurassic (Oxfordian) hermit crabs. A. Diogenicheles theodorae gen. et sp. nov. B. Masticacheles longirostris gen. et sp. nov. C. Pilgrimcheles karolinae gen. et sp. nov.
Fig. 2 in New Late Jurassic symmetrical hermit crabs from the southern Polish Uplands and early paguroid diversification
Fig. 2. Paguroid hermit crabs from the Oxfordian (Late Jurassic) of Bzów (A, B, E, F) and Ogrodzieniec (C, D). A. Diogenicheles theodorae gen. et sp. nov., holotype; I−F/MP/3957/1533/08(ISEA). B, C. Pilgrimcheles karolinae gen. et sp. nov. B. Holotype; I−F/MP/3953/1533/08(ISEA). C. Paratype MAB k. 3205. D–F. Masticacheles longirostris gen. et sp. nov. D. Holotype; I−F/MP/6194/1577/10 (ISEA). E. Paratype; I−F/MP/3958/1533/08(ISEA). F. Paratype; MAB k. 3204. Scale bars 2 mm.
Fig. 4 in Cosmopolitan Early Jurassic marine gastropods from west-central Patagonia, Argentina
Fig. 4. Southern hemisphere map showing the paleobiogeographical distribution of the cosmopolitan Jurassic gastropod genere reported herein. Note that the occurrence of the new Lower Toarcian gastropod association in "El Córdoba" fossiliferous locality (*) (Chubut province, Argentina) extends the paleobiogeographical distribution of the group in South America.
Fig. 3. Early Jurassic gastropods from Argentina A in Cosmopolitan Early Jurassic marine gastropods from west-central Patagonia, Argentina
Fig. 3. Early Jurassic gastropods from Argentina A. Zygopleuridae? gen. et sp. indet., "El Córdoba" fossiliferous locality, Chubut Province. MPEF−PI 1886, latex cast of external mold in lateral view. B–D. Cryptaulax damborenae sp. nov., "El Córdoba" fossiliferous locality, Chubut Province. B. MPEF−PI 1878b, holotype, latex cast of external mold in lateral (B1, B2) and basal (B3) views, ornament detail (B4). C. MPEF−PI 1877, paratype, latex cast of external mold of incomplete teleoconch in apertural view. D. MPEF−PI 1872b, paratype, latex cast of external mold of incomplete teleoconch in lateral view. E. Cryptaulax cf. damboreneae sp. nov., Cerro Puchenque locality, Mendoza Province. MLP 18742, latex cast of external mold of incomplete teleoconch; adult teleoconch in lateral view. F–H. Cryptaulax nulloi sp. nov., "El Córdoba" fossiliferous locality, Chubut Province. F. MPEF−PI 1870, holotype, latex cast of external mold. Adult teleoconch in lateral view (F1), juvenile teleoconch in lateral view (F2). G. MPEF−PI 1861, paratype, latex cast of external mold in lateral and apertural view. H. MPEF−PI 1871, latex cast of external mold of incomplete teleoconch in lateral view (H1), and its ornament detail (H2). Scale bars 1 mm.
Fig. 2 in Cosmopolitan Early Jurassic marine gastropods from west-central Patagonia, Argentina
Fig. 2. Early Jurassic gastropods from the "El Córdoba" fossiliferous locality, Chubut Province, Argentina. A. Amberleya? espinosa sp. nov. MPEF−PI 1882, holotype, latex cast of external mold in lateral view (A1, A2), juvenile teleoconch in lateral view (A3), last whorl in lateral view (A4), basal and apertural view (A5), ornament pattern and sutural detail (A6). B. Colpomphalus? sp. MPEF−PI 1863, latex cast of external mold of incomplete teleoconch in apical and lateral view (B1–B3), last whorl ornament detail showing the spiral furrow (B4). C. Striatoconulus sp. MPEF−PI 1867b, latex cast of external mold in apical view (C1), apical detail (C2), first teleconch whorls lateral view (C3). Scale bars 2 mm unless otherwise indicated.
Fig. 1. A in Cosmopolitan Early Jurassic marine gastropods from west-central Patagonia, Argentina
Fig. 1. A. Map of the western part of the South American continent showing the localities of new gastropod faunas in Argentina. 1, Cerro Puchenque, Mendoza; 2, Osta Arena Formation area in west−central Patagonia. B. Location map of "El Córdoba" fossiliferous locality (*).
Fig. 7 in Crouching theropod and Navahopus sauropodomorph tracks from the Early Jurassic Navajo Sandstone of USA
Fig. 7. Comparisons between the manual and pedal skeleton of sauropodomorph material from the Navajo Sandstone of northern Arizona and the Navahopus coyoteensis isp. nov. trackway from Coyote Buttes. The skeletal material was originally referred to as Ammosaurus (Galton 1971), but has recently been revised and reinterpreted as belonging to an indeterminate sauropodomorph (Yates 2004). A. The manus of the sauropodomorph from northern Arizona is tridactyl and consists of two short, forward−facing digits (II and III) and the large pollex claw of digit I directed inward. The pes is tetradactyl with digits III and IV of subequal length, followed by the shorter digits II and I; modified from Baird (1980). B. Manus and pes couple from N. coyoteensis. Note the close correspondence between the pedal skeleton and the tracks, here shown to the same scale.
Fig. 3 in Crouching theropod and Navahopus sauropodomorph tracks from the Early Jurassic Navajo Sandstone of USA
Fig. 3. Trace of a crouching theropod (left in the field). A. The crouching track comprises subparallel impressions of the metatarsus, two small, undetailed manus imprints, the imprints of the ischial callosity, the impression of the tail, and tracks from the dinosaur walking toward and away from the resting site. Upslope direction is to the right. Knivehandle is 10 cm long. B. Interpretative drawing of an unspecified small theropod dinosaur crouching down to produce the configuration of tracks seen in A. The manus posture during resting, where only the metacarpals are in contact with the ground producing an amorphous rounded depression is based on Weems (2006). The animal was progressing directly up the slope and was crouching facing upslope before it continued directly up the dune face.
Fig. 6 in Crouching theropod and Navahopus sauropodomorph tracks from the Early Jurassic Navajo Sandstone of USA
Fig. 6. The ichnofamily Navahopodidae, characterized by the tridactyl manus impression with the prominent inward directed pollex trace. A. Navahopus falcipollex Baird, 1980, the holotype MNA P3.339 from the collection of the Museum of Northern Arizona, Flagstaff. B. Baird's (1980) interpretation of Navahopus falcipollex as a sauropodomorph trackway, with an enlarged medially directed pollex claw. C. New interpretative drawing of Navahopus falcipollex, with less pronounced pollex impressions, and suggested mammal affinities. From Lockley and Hunt (1995). D. Sketch of Navahopus coyoteensis isp. nov. manus and pes couplets from left and right side of the trackway. In the pes prints, digits III and IV are separated by a deep hypex, recognizable in all well−preserved tracks in the trackway. All manus prints in the new trackway show consistent impressions of a large, medially directed pollex claw, supporting the original interpretation of Baird (1980), that Navahopus was made by a sauropodomorph dinosaur. Compare with Fig. 7. E. New interpretation of Tetrasauropus unguiferus Ellenberger, 1972 from the Lower Stormberg assemblage of Southern Africa (Porchetti and Nicosa 2007).
Fig. 5 in Crouching theropod and Navahopus sauropodomorph tracks from the Early Jurassic Navajo Sandstone of USA
Fig. 5. Sketch of the trackway in figure 4. The sketch is redrawn from high−resolution digital photographs of the trackway. RM, right manus; LM, left manus; RP, right pes; LP, left pes. The solid arrow indicates the direction of progression and the broken−line arrow the orientation of the body during progression. Notice how the animal walked at an oblique angle upslope in the first half of the trackway, and then changed to progress head on, up the slope.
Fig. 2 in Crouching theropod and Navahopus sauropodomorph tracks from the Early Jurassic Navajo Sandstone of USA
Fig. 2. Theropod trackways from the Early Jurassic Navajo Sandstone, Coyote Buttes locality, USA (both left in the field). A. Long, narrow−gauge trackway from a small theropod. Backpack is 50 cm high. B. Close−up of two consecutive footprints that are preserved as true tracks infilled with darker colored, lithified sand. Knivehandle is 10 cm long.
Fig. 1 in Crouching theropod and Navahopus sauropodomorph tracks from the Early Jurassic Navajo Sandstone of USA
Fig. 1. Stratigraphic column of the Navajo Sandstone outcrop at Coyote Buttes. The studied tracks are all found at the top of the middle zone of bioturbation. The Coyote Buttes locality is located on Bureau of Land Management property (accessible by permit only) at the border between Utah and Arizona at 36°59'58''N, 112°00'35''W. Ichnofabric index 1–5 is zero to total bioturbation.
Fig. 4 in Crouching theropod and Navahopus sauropodomorph tracks from the Early Jurassic Navajo Sandstone of USA
Fig. 4. Trackway of Navahopus coyoteensis isp. nov., as shown by Loope and Rowe (2003) and here reinterpreted as a sauropodomorph dinosaur walking up the lee slope of a dune. Note the elongate traces from the claws being dragged through the sediment. The present day slope is approximately 25°, due to compaction of the sediments. The original angle of slope was around 32° which is the residual angle of slope of dry sand after shearing (Allen 1984). Hammer is 30 cm long.
Fig. 7 in Early ontogeny of Jurassic bakevelliids and their bearing on bivalve evolution
Fig. 7. Phylogeny hypothesis for the Pteriomorphia based on a combined analysis of genetic and morphological characters (after Giribet and Wheeler 2002: fig. 8; modified). The assumed position of larval key characters and of some fossil taxa are shown. Character states in brackets are based on indirect evidence from other character states, or, in the case of Pterineidae and Ambonychioidea, based on phylogeny hypotheses of Carter (1990). Character state L'4 of the Limopsoidea is suggested by observations of Malchus and Linse (unpublished).
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