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572 results for “Late Eocene”
FIGURE 1 in Revision of so-called Pomatoschistus (Gobiiformes, Teleostei) from the late Eocene and early Oligocene
FIGURE 1. Phylogeny of the Gobiiformes according to Thacker et al. (2015) and Nelson et al. (2016). 6brG = gobiiforms with six branchiostegal rays, 5brG = gobiiforms with five branchiostegal rays.
FIGURE 8 in Revision of so-called Pomatoschistus (Gobiiformes, Teleostei) from the late Eocene and early Oligocene
FIGURE 8. †Paralates chapelcorneri n. sp., NHMUK PV P 59784. 1. Complete specimen. 2. Skull showing possible symplectic and six branchiostegals. Abbreviations: 1–6 = branchiostegals, ect = ectopterygoid, mpt = metapterygoid, sf = suspensorium fenestra, sym = symplectic. (Photos by K. Webb; © The Trustees of the Natural History Museum, London)
FIGURE 2 in First early Eocene lizards from Spain and a study of the compositional changes between late Mesozoic and early Cenozoic Iberian lizard assemblages
FIGURE 2. Paleogeographic map of Western Europe during the early Eocene (modified from Marandat et al., 2012) and situation of the Catalan localities yielding material described in the text and other contemporaneous European fossil sites. Note that the localities of the Southern Pyrenean Basin (Escarlà, La Roca, Masia de l'Hereuet, Barranc del Fusteró and Font del Torricó) are geographically very close, although situated in different sub-basins (see text).
FIGURE 1. Selected lizard and amphisbaenian material from studied localities. 1-2 in First early Eocene lizards from Spain and a study of the compositional changes between late Mesozoic and early Cenozoic Iberian lizard assemblages
FIGURE 1. Selected lizard and amphisbaenian material from studied localities. 1-2, Geiseltaliellus sp.: 1, left dentary (IPS 49740); 2, maxilla (IPS 83552); 3-4, Iguanidae indet.: 3, fragment of dentary (IPS 83535) with one preserved tooth, 4, fragment of?maxilla with four preserved teeth (IPS 49756); 5-6, Agamidae indet.: 5, Fragment of toothbearing bone preserving one tooth (IPS 83546), 6, fragment of dentary preserving two teeth (IPS 83543). 7-8, Gekkota indet.: 7, posterior portion of left dentary (IPS 59559), 8, anterior portion of left dentary (IPS 83520); 9, Scincoidea (?Scincidae) indet., fragment of right dentary (IPS 49752); 10,?Lacertidae indet., fragment of tooth-bearing bone perserving two teeth (IPS 49762); 11, Amphisbaenia indet., vertebra (IPS 59529); 12, cf. Placosaurus sp., partial parietal with fused osteoderms (IPS 59567); 13, Glyptosaurini indet., skull osteoderm (IPS 83532); 14, Glyptosaurinae indet., body osteoderm (IPS 83533); 15-18, Anguinae indet.: 15, keeled body osteoderm (IPS 83540), 16, unkeeled body osteoderm (IPS 83533), 17, partial parietal (IPS 83557), 18, vertebra (IPS 59538); 19-20, "Necrosauridae" indet.: 19, partial left dentary (IPS 83545), 20, osteoderm (IPS 49741). 1, 2, 5, 6, 11, 15 and 17-20 from Masia de l'Hereuet (MP8+9); 3, 4, 7, 8, 10 and 14 from La Morera (MP10); 12 from Escarlà (MP10); 13 and 16 from Font del Torricó. 1-10 and 19 in labial view; 11-12, 17 in dorsal view; 13-16 and 20 in external view; 18 in ventral view.
FIGURE 3 in First early Eocene lizards from Spain and a study of the compositional changes between late Mesozoic and early Cenozoic Iberian lizard assemblages
FIGURE 3. Distribution of lizard and amphisbaenian taxa from the latest Cretaceous to the late Eocene in the Iberian Peninsula. Records from Font del Torricó are omitted because its exact age inside the early Eocene is unknown. Black squares indicate unambiguous records, whereas grey squares indicate uncertainty. LaMa: Late Maastrichtian; eLaMa: earliest Late Maastrichtian; E/LaMa: Early or Late Maastrichtian; Late Campanian.
FIGURE 6 in Apatemyids (Mammalia, Apatotheria) from the middle Chadronian (late Eocene) of Sioux County, Nebraska, US
FIGURE 6. Teeth of Sinclairella dakotensis from Sioux County, Nebraska. 1, right M1 (UMPC 14860); 2, right M3 (UMPC 14864); 3, left P4 (SDSM 10392); 4, left M1 (UMPC 13937); 5, left M2 (UMPC 14862); 6, right M3 (UMPC 14863) (reversed); 7, left p2 (SDSM 10244) (reversed); 8, right m1 (UMPC 14861); 9, left m2 (UMPC 14866) (reversed); 10, left m3 (SDSM 10245) (reversed); 11, right m1 (UMPC 13938) and 12, left m2 (UMPC 13869). Teeth are shown in occlusal view. Divisions in scale are approximately 1 mm.
FIGURE 3. Apatemyid first molars from Raben Ranch. 1 and 2, right m1s in Apatemyids (Mammalia, Apatotheria) from the middle Chadronian (late Eocene) of Sioux County, Nebraska, US
FIGURE 3. Apatemyid first molars from Raben Ranch. 1 and 2, right m1s of Sinclairella dakotensis (SDSM 10241) and 3, right m1 of Apatemys sp. (SDSM 10242). Teeth are shown in occlusal view. Scale is approximately 1 mm.
FIGURE 4 in Apatemyids (Mammalia, Apatotheria) from the middle Chadronian (late Eocene) of Sioux County, Nebraska, US
FIGURE 4. Plot of apatemyid M2 width x length. Circles indicate Sinclairella dakotensis specimens. Squares indicate Apatemys specimens. The open square indicates the Whitehead Creek specimen described in this study. Data for AMNH 56046 and YPM 15284 are from West and Atkins (1970). Data for (RSM) P2374.006 are from Meyer (2007). Sinclairella data come from Clemens (1964), Cavin and Samuels (2012), and this study.
FIGURE 5 in Apatemyids (Mammalia, Apatotheria) from the middle Chadronian (late Eocene) of Sioux County, Nebraska, US
FIGURE 5. Plot of natural log width x length of M2, open symbols above diagonal, and m1, solid symbols below diagonal from different apatemyid species, the M2 from Whitehead Creek (UMPC 14190), and the m1 from Raben Ranch (SDSM 10242). Note the compatible size relationship between the specimens from the Chadronian of Sioux County, Nebraska (circles). Data are compiled from the following sources: Apatemys chardini (Gingerich, 1982; Ma, 1998), A. bellulus (Gazin, 1958; Ma, 1998), A. bellus (Gazin, 1958; West, 1973; Ma, 1998), Sinclairella dakotensis (Clemens, 1964; Ostrander, 1987; Cavin and Samuels, 2012; this study).
FIGURE 2. Apatemys specimens from the Whitehead Creek locality. 1, left M2 in Apatemyids (Mammalia, Apatotheria) from the middle Chadronian (late Eocene) of Sioux County, Nebraska, US
FIGURE 2. Apatemys specimens from the Whitehead Creek locality. 1, left M2 (UMPC 14190) and 2, left M3 (UMPC 14191). Teeth are shown in occlusal view. Scale is approximately 1 mm.
FIGURE 1 in Apatemyids (Mammalia, Apatotheria) from the middle Chadronian (late Eocene) of Sioux County, Nebraska, US
FIGURE 1. Apatemyid localities in Sioux County, Nebraska. R: Raben Ranch locality of Ostrander (1980, 1987); A: Anthill locality of Hough and Alf (1956); T: Twin Buttes locality of Ostrander (1985); S: Sand Creek locality; O: Orella Road locality; W: Whitehead Creek locality.
FIGURE 8 in Late middle Eocene caviomorph rodents from Contamana, Peruvian Amazonia
FIGURE 8. Morphological variation of the lower molars (in occlusal view) of Cachiyacuy contamanensis from CTA-27. 1, MUSM 1878; 2, MUSM 2704; 3, MUSM 2684; 4, MUSM 2708; 5, MUSM 2692; 6, MUSM 2701; 7, MUSM 2714; 8, MUSM 2689; 9, MUSM 1915; 10, MUSM 1914. Original computerized schemas (1-10) by Myriam Boivin.
FIGURE 6 in Late middle Eocene caviomorph rodents from Contamana, Peruvian Amazonia
FIGURE 6. Scanning electron microscope images of fossil caviomorph teeth from CTA-29. Pozomys ucayaliensis gen. et sp. nov. (1-6), Cachiyacuy cf. contamanensis 2 (7-12), Caviomorpha indet. 5 (13), Caviomorpha indet. 6 (14) and Cavioidea or Chinchilloidea indet. (15-17). 1, right m1-2, occlusal view (MUSM 2822); 2, left p4, occlusal view (MUSM 2821, reversed); 3, fragmentary right M3, occlusal view (MUSM 2819); 4, right M2, occlusal view (MUSM 2833); 5, right m1-2, labial view (MUSM 2822); 6, right m1-2, lingual view (MUSM 2822); 7, left dp4, occlusal view (MUSM 2825); 8, right m1, occlusal view (MUSM 2827, reversed); 9, right dP4, occlusal view (MUSM 2828, reversed); 10, left M1, occlusal view (MUSM 2831); 11, right M2, occlusal view (MUSM 2563, reversed); 12, fragmentary left M2, occlusal view (MUSM 2832); 13, right dp4, occlusal view (MUSM 2838); 14, fragmentary right upper molar, occlusal view (MUSM 2839); 15, right m2, occlusal view (MUSM 2835); 16, right dp4, occlusal view (MUSM 2834); 17, fragmentary right upper molar, occlusal view (MUSM 2836, reversed).
FIGURE 5 in Late middle Eocene caviomorph rodents from Contamana, Peruvian Amazonia
FIGURE 5. Scanning electron microscope images (in occlusal view) of fossil caviomorph teeth from CTA-47 (1-4), CTA-51 (5-12), CTA-73 (13-14) and CTA-66 (15-16).?Canaanimys sp. (1-2),?Cachiyacuy kummeli (3), Caviomorpha indet. 1 (4), Cachiyacuy cf. contamanensis 1 (5-7), Caviomorpha indet 2 (8-10), Cachiyacuy cf. kummeli (11), Eoespina sp. (12), Caviomorpha indet 3 (13), Caviomorpha indet 4 (14) and Eobranisamys sp. (15-16). 1, fragmentary right dp4 (MUSM 2645); 2, fragmentary left lower molar (MUSM 2646); 3, fragmentary left dP4 (MUSM 2648); 4, fragmentary right lower molar (MUSM 2647); 5, fragmentary right dp4 (MUSM 2651, reversed); 6, left m1 (MUSM 2652); 7, left m3 (MUSM 2653); 8, fragmentary right lower molar (MUSM 2656); 9, fragmentary left dP4 (MUSM 2657); 10, fragmentary left upper molar (MUSM 2658); 11, fragmentary left M1 (MUSM 2654); 12, right M2 (MUSM 2655); 13, fragmentary right lower molar (MUSM 2659); 14, fragmentary left upper molar (MUSM 2660); 15, fragmentary left upper molar? (MUSM 2841); 16, fragmentary left upper molar (MUSM 2842). Top scale for 1-12, bottom scale for 13-16.
FIGURE 4 in Late middle Eocene caviomorph rodents from Contamana, Peruvian Amazonia
FIGURE 4. Scanning electron microscope images (in occlusal view) of fossil caviomorph teeth from CTA-27. Cachiyacuy contamanensis (1-6), Eobranisamys javierpradoi sp. nov. (7-8), Cachiyacuy kummeli (9-13), Canaanimys maquiensis (13-16) and cf. Eoespina sp. (17). 1, right m3 (MUSM 2713); 2, right m2 (MUSM 1914); 3, right m2 (MUSM 1915); 4, right p4 (MUSM 2678); 5, fragmentary right dp4 (MUSM 2670); 6, left M3 (MUSM 2758); 7, right dP4 (MUSM 2797); 8, fragmentary left M3 (MUSM 2801); 9, left dp4 (MUSM 2762); 10, left p4 (MUSM 2766); 11, right m3 (MUSM 2780, reversed); 12, left M1 (MUSM 2785); 13, left M2 (MUSM 2786); 14, fragmentary right M3 (MUSM 2794); 15, right M3 (MUSM 2793); 16, left M3 (MUSM 2792, reversed); 17, fragmentary left M2 (MUSM 2802). Top scale for 1-13, bottom scale for 14-17.
FIGURE 3 in Late middle Eocene caviomorph rodents from Contamana, Peruvian Amazonia
FIGURE 3. Dental nomenclature for lower teeth in occlusal view. 1, lower molar; 2, p4; 3, dp4. 1, protoconid; 2, metaconid; 3, mesoconid; 4, entoconid; 5, hypoconid; 6, mesostylid; 7, metalophulid I; 8, posterior arm of the metaconid; 9, posterior arm of the protoconid; 10, neomesolophid; 11, second transverse cristid; 12, mesolophid; 13, rest of the mesolophid?; 14, ectolophid; 15, mesial ectolophid; 16, distal ectolophid; 17, hypolophid; 18, anterior arm of the entoconid; 19, posterior arm of the entoconid; 20, anterior arm of the hypoconid; 21, posterior arm of the hypoconid; 22, anterior outgrowth of the hypoconid; 23, posterolophid; 24, anteroflexid/anterofossettid; 25, mesoflexid; 26, mesial mesoflexid; 27, distal mesoflexid; 28, confluence of the anteroflexid with the mesoflexid; 29, hypoflexid; 30, metaflexid; 31, confluence of the hypoflexid with the metaflexid. Based on observations made on the new material, the dental terminology is modified after Wood and Wilson (1936), Fields (1957), Marivaux et al. (2004, 2017) and Antoine et al. (2012).
FIGURE 1 in Late middle Eocene caviomorph rodents from Contamana, Peruvian Amazonia
FIGURE 1. Geographic location and Cenozoic stratigraphy of the Contamana area, Peru. 1, location map of the Contamana area in Peruvian Amazonia (Loreto Department). 2-3, synthetic stratigraphic units of the complete Contamana Cenozoic sequence along the Cachiyacu stream (modified after Antoine et al., 2016, figure 3), including fossil-bearing levels, among which Eocene rodent-yielding localities CTA-47, CTA-51, CTA-73, CTA-27, CTA-66, and CTA-29. Note also in the same section, the location of the other rodent-bearing localities, designated by an asterisk, in the Pozo, Chambira and Pebas Fm.; 2, NE Flank of the Maquía Anticline; 3, SW Flank of the Maquía Anticline. Modified from Antoine et al. (2012, 2016). Fm., Formation.
FIGURE 2 in Late middle Eocene caviomorph rodents from Contamana, Peruvian Amazonia
FIGURE 2. Dental nomenclature for upper teeth in occlusal view. 1, upper molar; 2, P4; 3, dP4. 1, paracone; 2, protocone; 3, metacone; 4, hypocone; 5, parastyle; 6, mesostyle; 7, anteroloph; 8, anterior arm of the protocone; 9, posterior arm of the protocone (= lingual protoloph); 10, posterior outgrowth of the protocone; 11, protoloph (= labial protoloph); 12, mure; 13, third transverse crest (= central transverse crest); 14, mesolophule; 15, mesoloph; 16, anterior arm of the hypocone; 17, metaloph; 18, posteroloph; 19, paraflexus; 20, hypoflexus/hypofossette; 21, confluence of the paraflexus with the hypoflexus; 22, mesoflexus/mesofossette; 23, metaflexus; 24, confluence of the metaflexus with the posteroflexus; 25, posteroflexus. Based on observations made on the new material, the dental terminology is modified after Wood and Wilson (1936), Fields (1957), Marivaux et al. (2004, 2017) and Antoine et al. (2012).
FIGURE 7 in Late middle Eocene caviomorph rodents from Contamana, Peruvian Amazonia
FIGURE 7. Morphological variation of the p4 (in occlusal view) of Cachiyacuy contamanensis from CTA-27. 1, MUSM 2674; 2, MUSM 2676; 3, MUSM 2677; 4, MUSM 1879; 5, MUSM 2678. Original computerized schemas (1-5) by Myriam Boivin.
Fig. 2 in A new ant genus from the late Eocene European amber
Fig. 2. Myrmicine ant Eocenomyrma electrina sp. nov., the holotype worker, ZMUC 328, from the Scandinavian Amber, late Eocene. A, B. Photograph in dorso−lateral view (A), and head and mesosoma in dorso−lateral view (B). C, D. Explanatory drawings, based on the original photographs; head, mesosoma, waist, and base of gaster in dorso−lateral view (C), and mesosoma, waist, and base of gaster in lateral view (D).
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