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532 results for “Middle Eocene”
FIGURE 1 in Diptera of the middle Eocene Kishenehn Formation. I. Documenting of diversity at the family level
FIGURE 1. Tipula (Trichotipula) fji sp. nov., USNM 625687, male. 1, Habitus; 2, Posterior portion of the abdomen showing aedeagus; 3, Terminalia; 4, Halter; 5, tarsal claws. The arrows point to the front tarsal claw (left) and the terminal tarsomere of either the middle or back leg (right). Scale bars equal 10.0 mm (1), 2.0 mm (2) and 0.5 mm (3-5), respectively.
FIGURE 3 in A new Symphoromyia in the Middle Eocene Baltic amber (Diptera: Rhagionidae)
FIGURE 3. Symphoromyia clerci sp. nov., holotype MNHN.F.A71322. Legs, arrows tibial spurs. Scale bar represents 1 mm.
FIGURE 2 in A new Symphoromyia in the Middle Eocene Baltic amber (Diptera: Rhagionidae)
FIGURE 2. Symphoromyia clerci sp. nov., holotype MNHN.F.A71322. A, head profile; B, head above; C, thorax lateral; D, wing; E, wings, basal parts; F, thorax above. Scale bars represent 1 mm.
Data from: Basilotritus uheni, a new cetacean (Cetacea, Basilosauridae) from the late Middle Eocene of Eastern Europe
A new basal basilosaurid cetacean, Basilotritus uheni n. gen. n. sp., comes from the late middle Eocene (Bartonian) of Ukraine. It is the earliest dated record of a cetacean from Eastern Europe. The tympanic bulla of Basilotritus uheni shares basilosaurid synapomorphies but possesses unusual traits inherited from protocetids. Cetaceans related to Basilotritus uheni and referred to as Eocetus or "Eocetus" have been recorded from Africa, Europe, North America and South America. "Eocetus" wardii from North America is recombined as Basilotritus wardii. Platyosphys paulsonii and Platyosphys einori from Ukraine are considered as nomina dubia; specimens prior referred to as Platyosphys sp. are similar or related to Basilotritus. Other records of the Eocene cetaceans from Ukraine and south Russia are identified as Basilotritus or related genera. Early basilosaurids are demonstrated to be a paraphyletic, morphologically and geographically diverse group of the genera that colonized the world ocean as late as in Bartonian age and were probably the ancestors of Neoceti, as well as of more derived basilosaurids.
Data from: Abyssal benthic foraminifera in the eastern equatorial Pacific (IODP Exp 320) during the middle Eocene
We report on the faunal transition of benthic foraminifera during the middle Eocene at Site U1333 (4862 m water depth, 3560-3720 m paleo-water depth) of Integrated Ocean Drilling Program Expedition 320 in the eastern equatorial Pacific Ocean. During the period ~41.5-40.7 Ma, which includes carbonate accumulation event 3 (CAE-3), the benthic foraminiferal accumulation rate (BFAR) increased gradually and then it declined rapidly. In contrast, BFAR was considerably lower during ~40.7-39.4 Ma, corresponding to the middle Eocene climatic optimum (MECO), and then it increased during ~39.3-38.4 Ma, including CAE-4. Diversity (E [S200]) was slightly lower in the upper part of the study interval than in the lower part. The most common benthic foraminifera were Nuttallides truempyi, Oridorsalis umbonatus and Gyroidinoides spp. in association with Globocassidulina globosa and Cibicidoides grimsdalei during the period studied. Quadrimorphina profunda occurred abundantly with N. truempyi, O. umbonatus and G. globosa during ~39.4-38.4 Ma, including CAE-4, although this species was also relatively common in the lower part of the study interval. Virgulinopsis navarroanus and Fursenkoina sp. A, morphologically infaunal taxa, were common during ~38.8-38.4 Ma, corresponding to the late stage of CAE-4. Based on Q-mode cluster analysis, four sample clusters were recognized and their stratigraphic distributions were generally discriminated in the lower and upper parts of the study interval.. Thus, there was only a small faunal transition in the abyssal eastern equatorial Pacific during the middle to late-middle Eocene. The faunal transition recognized in this study may be related to recovery processes following intense carbonate corrosiveness in the eastern equatorial Pacific during MECO.
FIGURE 2 in New fossil lace bugs (Heteroptera: Tingidae) from the Middle Eocene of the Grube Messel (Germany), with a catalog of fossil lace bugs
FIGURE 2. Exmesselensis disspinosus gen. et sp. n., reconstruction of the holotype, (macropterous form), compression fossil; coll. Forschungsinstitut Senckenberg (SMF), Frankfurt am Main (Germany), specimen SMF MeI 6301; scale bar represents 0.5 mm.
FIGURE 11 in New fossil lace bugs (Heteroptera: Tingidae) from the Middle Eocene of the Grube Messel (Germany), with a catalog of fossil lace bugs
FIGURE 11. Oblongomorpha lutetia gen. et sp. n., reconstruction of the holotype, (macropterous form), compression fossil; coll. Forschungsinstitut Senckenberg (SMF), Frankfurt am Main (Germany), specimen SMF MeI 10508; scale bar represents 1 mm.
FIGURE 9–10. 9 in New fossil lace bugs (Heteroptera: Tingidae) from the Middle Eocene of the Grube Messel (Germany), with a catalog of fossil lace bugs
FIGURE 9–10. 9, Dorsal habitus of holotype of Chorotingiotes prisca (SMF MeI 7690); 10, Detail of areolate hemelytra of C. prisca (SMF MeI 7690).
FIGURE 3–6. 3 in New fossil lace bugs (Heteroptera: Tingidae) from the Middle Eocene of the Grube Messel (Germany), with a catalog of fossil lace bugs
FIGURE 3–6. 3, Dorsal habitus of holotype of Exmesselensis disspinosus (SMF MeI 6301); 4, Detail of areolate hemelytra of E. disspinosus (SMF MeI 6301); 5, Lateral habitus of paratype (SMF MeI 6958); 6, Detail of head and antennae structures (SMF MeI 6958).
Figure 8 in A new basal tomistomine (Crocodylia, Crocodyloidea) from Issel (Middle Eocene; France): palaeobiogeography of basal tomistomines and palaeogeographic consequences
Figure 8. Phylogenetic relationships of basal tomistomines and palaeobiogeography. A–E, first hypothesis; A, F–I, second hypothesis. A, early Ypresian, with Maroccosuchus zennaroi (1 and 1?), cf. Kentisuchus sp. (K?); B, F, middle to late Ypresian with M. zennaroi (1 and 1?), and Kentisuchus spenceri (2); C, G, early Lutetian, with Dollosuchoides densmorei (5), and Tomistominae indet. (T); D, H, late Lutetian, with 'Tomistoma' cairense (6) and Kentisuchus astrei sp. nov. (3); E, I, Bartonian with Megadontosuchus arduini (4) and Paratomistoma courtii (7). Maps modified and redrawn from Ron Blakey (http://www2.nau.edu/rcb7/, updated page: March 2011, Copyright Ron Blakey) (A–C; F, G) and maps and descriptions of Meulenkamp et al. (2000a, b) and Radionova et al. (2003), and Andeweg (2002) for west Europe and Iberian Peninsula (A–E; F–I), and Meulenkamp & Sissingh (2003) (D, E, H, I).
Figure 5 in A new basal tomistomine (Crocodylia, Crocodyloidea) from Issel (Middle Eocene; France): palaeobiogeography of basal tomistomines and palaeogeographic consequences
Figure 5. Kentisuchus spenceri from the Ypresien of England. A, NHM 19633, holotype; B, NHM 19633, holotype; C, NHM 37717; D, NHM 38974; E, Kentisuchus astrei sp. nov., holotype, MHNT.PAL.2010.0.49. The arrows indicate the shallow fossa along the lateroventral to the lacrimomaxillary contact. Scale bar: 1 cm.
Figure 6 in A new basal tomistomine (Crocodylia, Crocodyloidea) from Issel (Middle Eocene; France): palaeobiogeography of basal tomistomines and palaeogeographic consequences
Figure 6. Cladogram summarizing the phylogenetic relationships of Kentisuchus astrei sp. nov. The topology shown is the strict consensus of 99 most-parsomonious trees, with tree lengths of 875 steps, consistency index, CI = 0.359, and retention index, RI = 0.717. For the character list, taxa/character matrix, and complete consensus tree see Appendices S1–S3. Bremer indices are indicated for each node.
Figure 4 in A new basal tomistomine (Crocodylia, Crocodyloidea) from Issel (Middle Eocene; France): palaeobiogeography of basal tomistomines and palaeogeographic consequences
Figure 4. Kentisuchus astrei sp. nov., holotype, MHNT.PAL.2010.0.49, skull. Late Lutetian sandstone, Issel, Aude, France. Right latral view: A, photograph; B, interpretative drawing. Abbreviations: 1st MxA, first maxillary alveoli; F, frontal; J, jugal; L, lacrimal; Mx, maxilla; N, nasal; P, parietal; Po, postorbital; Prf, prefrontal; Q, quadrate; Qj, quadratojugal; Sq, squamosal; Stf, supratemporal fenestra.
Figure 3 in A new basal tomistomine (Crocodylia, Crocodyloidea) from Issel (Middle Eocene; France): palaeobiogeography of basal tomistomines and palaeogeographic consequences
Figure 3. Kentisuchus astrei sp. nov., holotype, MHNT.PAL.2010.0.49, skull. Late Lutetian sandstone, Issel, Aude, France. Dorsal view: A, photograph; B, interpretative drawing. Abbreviations: 1st MxA, first maxillary alveoli; F, frontal; J, jugal; L, lacrimal; Mx, maxilla; N, nasal; Npd, cast of the nasopharyngeal duct; Orb, orbit; P, parietal; PJf, posterodorsal jugal foramen; Po, postorbital; Prf, prefrontal; Q, quadrate; Qj, quadratojugal; Stf, supratemporal fenestra; Tc, temporal canal.
Figure 2 in A new basal tomistomine (Crocodylia, Crocodyloidea) from Issel (Middle Eocene; France): palaeobiogeography of basal tomistomines and palaeogeographic consequences
Figure 2. Holotype of 'Atacisaurus glareae' from the lacustrine deposits of Issel, late Lutetian, Aude Department, France, as illustrated (A) and interpreted (B) in Astre (1931). C, snout fragment from the vicinity of Carcassonne and preserved in the 'Collection Noulet' of the MHNT, referred to A. glareae by Astre (1931) (photo Y. Laurent, MHNT).
Figure 1 in A new basal tomistomine (Crocodylia, Crocodyloidea) from Issel (Middle Eocene; France): palaeobiogeography of basal tomistomines and palaeogeographic consequences
Figure 1. Geographic position of the outcrops exposing lacustrine deposits of Issel and Laure-Minervois, where both specimens previously attributed to 'Atacisaurus glareae' were collected.
FIGURE 75 in Coleoptera from the middle-upper Eocene European ambers: generic composition, zoogeography and climatic implications
FIGURE 75. Representatives of recent genera in Baltic amber (s.l.): A) Xestipyge ikanti Alekseev, 2016; B) Salpingus henricusmontemini Alekseev, 2013; C) Pseudobothrideres criwecriwayto Alekseev, 2015; D) Europs insterburgensis Alekseev, 2014; E) Diodesma slipinskii Alekseev et Bukejs, 2016; F) Dignomus regiomontanus Alekseev, 2014; G) Tetratoma nikitskyi Alekseev, 2013; H) Glipostena sp.; I) Escalerosia igori Alekseev et Grzymala, 2015.
FIGURE 76 in Coleoptera from the middle-upper Eocene European ambers: generic composition, zoogeography and climatic implications
FIGURE 76. Representatives of extinct genera in Baltic amber (s.l.): A) Warnis tvanksticus Lyubarsky, Perkovsky et Alekseev, 2016; B) Sucinolivolia torpida Bukejs, Biondi et Alekseev, 2015; C) Electrolichas circumbalticus Alekseev et Jäch, 2016; D) Curche pauli Alekseev et Kazantsev, 2014; E) Mistran ot Alekseev et Bukejs, 2016; F) Quasianisoxya curonensis Alekseev, 2015; G) Protolissodema ulrikae Alekseev, 2013.
FIGURES 65–72 in Coleoptera from the middle-upper Eocene European ambers: generic composition, zoogeography and climatic implications
FIGURES 65–72. Recent distribution (shaded area) and Eocene fossils (black dot) of genera: 65) Calomicrus; 66) Colaspoides; 67) Cryptocephalus; 68) Oxycraspedus; 69) Conapium; 70) Melanapion; 71) Pseudaspidapion; 72) Polydrusus.
FIGURES 73–74 in Coleoptera from the middle-upper Eocene European ambers: generic composition, zoogeography and climatic implications
FIGURES 73–74. Refugia of the Eocene beetle fauna: 73) Territories especially rich in surviving Eocene amber beetles (the highest concentration of range overlaps); 74) The climatically optimal territories and the main climate limitations for the surviving beetle genera from Baltic amber (s.l.): blue lines—CMM, the coldest month isotherms (approximately, sea-level, January in the North Hemisphere and July in the South Hemisphere); yellow lines—MAT, mean annual temperatures (approximately, sea-level); green and green-spotted areas—the most appropriate humid climatic territories generally limited by the mean of annual precipitation.
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Allen Brain Atlas
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OpenNeuro
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