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572 results for “Late Eocene”
Morphometric data of the late middle Eocene to early Oligocene (~40 - 31 Ma) Coccolithophore Reticulofenestra (Order Isochrysidales)
<p><span>The first size reduction (FSR) in the <em>Reticulofenestra-Gephyrocapsa-Emiliania (RGE)</em> lineage (Order Isochrysidales) which occurred in the early Oligocene (~ 32 Ma), is of great significance for understanding the lilliput effect that has affected the coccolithophore communities from late Eocene to this day. We conducted a morphologic analysis on the coccoliths of <em>Reticulofenestra</em> species that lived during the late middle Eocene to early Oligocene (~40-31 Ma), using marine sediments from the South Atlantic Ocean. Our data show increasing size and decreasing abundance of the large species during the late Eocene, leading to their disappearance at the FSR, and a concurrent decrease in the size variability of the small-medium-sized coccoliths whose diameter of the central opening had become very reduced. Although the cosmopolitan late Paleogene through Neogene size decrease in coccolithophores has been linked to the concomitant long-term decline in global <em>p</em>CO2, we suggest here that the FSR was the result of environmental destabilization caused by the expansion of eutrophic environments following the late Eocene establishment of overturning circulation associated with ice build-up on Antarctica. This study also leads us to propose a hypothetical model that links coccolith morphology of species of the <em>RGE </em>lineage and trophic resources in the upper ocean: the small- to medium-sized, r-selected coccolithophores with smaller coccolith central opening live in nutrient-rich waters where they rely mostly on photosynthesis and little on mixotrophy; whereas the larger, K-selected species with larger coccolith central opening live in oligotrophic waters where they are more dependent on mixotrophy.</span></p>
Morphometric data of the late middle Eocene to early Oligocene (~40 - 31 Ma) Coccolithophore Reticulofenestra (Order Isochrysidales)
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FIGURE 3 in A new species of Proneuronema (Neuroptera: Hemerobiidae) from late Eocene Rovno amber
FIGURE 3. Proneuronema sidorchukae sp. nov., holotype SIZK L-116. Thorax and anal areas of the forewings (dorsal view). amsc, anterior part of mesoscutum; mr, transversal medial ridge; ms, longitudinal medial suture; mscl, mesoscutellum; par, parapsidal suture; pmsc, posterior part of mesoscutum; prn, pronotum; psc, prescutum; ps, prescuto-scutal suture; vs, scutoscutellar suture. Scale bar = 0.5 mm.
FIGURE 2 in A new species of Proneuronema (Neuroptera: Hemerobiidae) from late Eocene Rovno amber
FIGURE 2. Forewing venation of Proneuronema sidorchukae sp. nov., holotype SIZK L-116. A, right forewing; B, left forewing (converted to standard view, with the apex to the right). Scale bar = 1 mm (both to same scale).
FIGURE 1 in A new species of Proneuronema (Neuroptera: Hemerobiidae) from late Eocene Rovno amber
FIGURE 1. Proneuronema sidorchukae sp. nov., holotype SIZK L-116. A, right side; B, left side. Scale bars = 1 mm.
FIGURE 4 in A new species of Succinoraphidia Aspöck & Aspöck, 2004 (Raphidioptera: Raphidiidae) from the late Eocene Rovno amber, with venation characteristics of the genus
FIGURE 4. Wing venation of Succinoraphidia radioni sp. nov., holotype SIZK L-105. A, left forewing; B, right forewing; C, left hind wing; D, right hind wing (A and C converted to standard view, with apex to the right). Fused veins are shown by red lines. Scale bar = 2 mm (all to scale).
FIG. 8 in Late Middle Eocene bats from the Creechbarrow Limestone Formation, Dorset, southern England with description of a new species of Archaeonycteris (Chiroptera: Archaeonycteridae)
FIG. 8. Trigonids of lower molars, Creechbarrow bats. Rhinolophidae gen. et sp. indet. M35711. Trigonid left lower molar in A — occlusal, B — buccal and C — lingual views. HZM 2.38159. Trigonid right lower molar in D — occlusal, E — buccal and F — lingual views. Microchiroptera gen. et sp. indet. HZM 22.34774. Trigonid right lower molar in G — occlusal, H — buccal
F. 4. Pseudorhinolophus schlosseri, Creechbarrow. HZM 1.31792. Left M2 in Late Middle Eocene bats from the Creechbarrow Limestone Formation, Dorset, southern England with description of a new species of Archaeonycteris (Chiroptera: Archaeonycteridae)
F. 4. Pseudorhinolophus schlosseri, Creechbarrow. HZM 1.31792. Left M2: A — occlusal and B — oblique distal views. HZM IG 3.38170. Left M1/2 in C — distal, D — lingual, E — buccal and F — occlusal views. Rhinolophidae gen. et sp. indet. HZM 1.31222.
FIG. 1 in Late Middle Eocene bats from the Creechbarrow Limestone Formation, Dorset, southern England with description of a new species of Archaeonycteris (Chiroptera: Archaeonycteridae)
FIG. 1. Archaeonycteris relicta sp. nov., Creechbarrow, mandibular cheekteeth. HZM 4.37495. Right P2 in A — occlusal, B — buccal and C — lingual views. Scale = 0.5 mm. HZM 5.38291. Left M3 (holotype) D — distal, E — lingual, F — buccal and G — occlusal
FIGURE 4 in The first new genus of the tribe Hypulini Seidlitz (Coleoptera: Melandryidae) described from late Eocene Baltic amber
FIGURE 4. Distribution and generic diversity of the tribe Hypulini in the present-day world (green area—distribution area of one genus; blue area—area of sympatric distribution for two genera), and locality of Eocene Madelinia gedanoposita gen. et sp. nov. (red dot). In the round photos are shown two extant representatives of the genus Hypulus from the Sambian Peninsula (Kaliningrad region), H. quercinus and H. bifasciatus.
FIGURE 3 in The first new genus of the tribe Hypulini Seidlitz (Coleoptera: Melandryidae) described from late Eocene Baltic amber
FIGURE 3. Reconstruction of Madelinia gedanoposita gen. et sp. nov. from Baltic amber: habitus, dorsal view. Body length approximately 5.8 mm.
FIGURES 1–2 in The first new genus of the tribe Hypulini Seidlitz (Coleoptera: Melandryidae) described from late Eocene Baltic amber
FIGURES 1–2. Madelinia gedanoposita gen. et sp. nov., holotype, No MAIG 6692, habitus: 1) dorsal view; 2) right lateral view. Scale bars represent 1.0 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.
FIGURE 8 in A contribution to the knowledge of Dryinidae from Late Eocene Baltic amber (Hymenoptera: Chrysidoidea), with description of new subfamily, Protodryininae subfam. nov.
FIGURE 8. Anteon gaullei Kieffer, female from Italy, Mt. Peglia, lateral view (from Olmi, 1984), length 3.0 mm. Protrochanter (indicated by an arrow).
FIGURE 7 in A contribution to the knowledge of Dryinidae from Late Eocene Baltic amber (Hymenoptera: Chrysidoidea), with description of new subfamily, Protodryininae subfam. nov.
FIGURE 7. Palaeoanteon janzeni Olmi, female in Baltic amber, length 6.9 mm. Protrochanter (indicated by an arrow).
FIGURE 5 in A contribution to the knowledge of Dryinidae from Late Eocene Baltic amber (Hymenoptera: Chrysidoidea), with description of new subfamily, Protodryininae subfam. nov.
FIGURE 5. Protodryinus eocenicus gen. et sp. nov., female holotype. Protarsus and chela (rudimentary claw indicated by an arrow).
FIGURE 3 in A contribution to the knowledge of Dryinidae from Late Eocene Baltic amber (Hymenoptera: Chrysidoidea), with description of new subfamily, Protodryininae subfam. nov.
FIGURE 3. Protodryinus eocenicus gen. et sp. nov., female holotype. A. Scutum, pronotum and head, lateral view (pronotum indicated by an arrow); B. Mesosoma, dorsal view (scutum indicated by an arrow); C. Propodeum, lateral view (indicated by an arrow); D. Fore wing (pterostigma and stigmal vein indicated by an arrow).
FIGURES 1, 2. 1 in A contribution to the knowledge of Dryinidae from Late Eocene Baltic amber (Hymenoptera: Chrysidoidea), with description of new subfamily, Protodryininae subfam. nov.
FIGURES 1, 2. 1. Lonchodryinus balticus sp. nov., holotype, female, length 4.0 mm; 2. Protodryinus eocenicus gen. et sp. nov., female holotype, length 5.0 mm
FIGURE 6 in A contribution to the knowledge of Dryinidae from Late Eocene Baltic amber (Hymenoptera: Chrysidoidea), with description of new subfamily, Protodryininae subfam. nov.
FIGURE 6. Megadryinus magnificus Richards, female holotype, lateral view (from Olmi, 1984), length 6.0 mm. Protrochanter (indicated by an arrow), pterostigma and stigmal vein.
FIGURE 4 in A contribution to the knowledge of Dryinidae from Late Eocene Baltic amber (Hymenoptera: Chrysidoidea), with description of new subfamily, Protodryininae subfam. nov.
FIGURE 4. Protodryinus eocenicus gen. et sp. nov., female holotype. A. Protrochanter (indicated by an arrow); B. Chela (rudimentary claw indicated by an arrow).
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Allen Brain Atlas
Allen Brain Atlas is an Allen Institute collection of brain map atlases, datasets, APIs, and analysis tools covering mouse, human, and non-human primate brain resources.
Annotated Behaviour and Observability Dataset (ABODe)
ABODe is a University of Edinburgh DataShare dataset for behavior classification in group-housed mice using home-cage video, identities, bounding boxes, ground-plate positions, and annotator labels.
DANDI Archive for NWB datasets
DANDI is a BRAIN Initiative archive for publishing and sharing neurophysiology data, including electrophysiology, optophysiology, and behavioral data packaged as NWB and related standards.
International Brain Laboratory public data
The International Brain Laboratory public data releases expose standardized mouse decision-making experiments, including Neuropixels recordings, widefield calcium imaging, behavior, and session metadata accessed through the ONE API.
OpenNeuro
OpenNeuro is a free, open platform for sharing neuroimaging datasets, with public search, dataset pages, and download paths for web, S3, DataLad, and the OpenNeuro CLI.