Groenlandia pescheri sp. nov. (Potamogetonaceae) from the Late Oligocene Fossil-Lagerstätte Enspel (Westerwald, Germany)

Uhl, Dieter; Poschmann, Markus

doi:10.2478/acpa-2018-0001

Cited by 9 publications

(21 citation statements)

References 25 publications

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“…The existence of such zones is furthermore indicated by the occurrence of e.g., crocodiles (Frey & Monninger, 2010), relatively abundant caddisfly larvae (Poschmann, 2006), and the well preserved macroflora (Köhler & uhl, 2014). For example, the aquatic plant Groenlandia has its richest occurrence at the base of layer S14 (uhl & Poschmann, 2018) just as the (gomphid) dragonfly larvae. Assuming that these larvae lived in these vegetation-rich, shallow-water zones furthermore explains their rareness as fossils, because the vegetation may form a kind of taphonomic filter by preventing dead larvae or exuviae from entering the open lake and eventually from reaching the anoxic lake bottom where they could be finally buried and subsequently fossilized (cf., Wuttke & Poschmann, 2010).…”

Section: Discussionmentioning

confidence: 99%

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Fossil dragonflies (Odonata: Anisoptera) from the late Oligocene Fossil-Lagerstätte Enspel (Rhineland-Palatinate, SW Germany)

Brockhaus¹,

Müller²,

Nel

et al. 2020

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Fossils of dragonflies (Odonata: Anisoptera), three larvae and one isolated hind wing, are described from the late Oligocene crater lake of Enspel (Westerwald, Germany). The larvae are interpreted to belong to one species, although representing three different ontogenetic stages. Comparison to extant taxa shows that the larvae are to be assigned to the clubtails (Gomphidae), namely to the genera Gomphidia or Ictinogomphus, or, more unlikely, Diastatomma in the subfamily Lindeniinae, and thus constitute the first record of larvae of this subfamily in the Oligocene. The venation pattern of the hind wing clearly shows that it belongs to a species in the family Macromiidae and thus constitutes the oldest record of this family.

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Section: Discussionmentioning

confidence: 99%

“…2). However, this is probably due to favourable preservational factors present in the basal layer of S14 (Poschmann & Wedmann, 2005;uhl & Poschmann, 2018), which yielded at least 28 specimens (for some, the exact position within S14 has not been recorded).…”

Section: Methodsmentioning

confidence: 99%

Fossil dragonflies (Odonata: Anisoptera) from the late Oligocene Fossil-Lagerstätte Enspel (Rhineland-Palatinate, SW Germany)

Brockhaus¹,

Müller²,

Nel

et al. 2020

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“…These include physiological‐biochemical parameters (such as q ) as well as environmental parameters. Information on leaf size indicating ranges of characteristic leaf length l c can be obtained from available data based on the fossil record (Uhl et al., 2007; West et al., 2015). Biochemical parameters have to be borrowed from ecologically representative relatives.…”

Section: Methodsmentioning

confidence: 99%

High Productivity at High Latitudes? Photosynthesis and Leaf Ecophysiology in Arctic Forests of the Eocene

Konrad

Roth‐Nebelsick

Traiser

2023

Paleoceanog and Paleoclimatol

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The Arctic forests of the Eocene, which thrived under elevated CO2, a temperate climate, high precipitation and annually extremely different daylengths, represent a quite spectacular no‐analogue habitat of Earth’s greenhouse past. The aim of this study was to improve our understanding of the ecophysiology of Arctic broad‐leaved deciduous forests of the Eocene, by analyzing leaf photosynthesis and tree productivity based on gas exchange modelling for two fossil Eocene sites, Svalbard and Ellesmere Island. For this, a single‐leaf photosynthesis model that includes heat transfer and leaf senescence was derived. Environmental conditions were based on available palaeoclimate data and a CO2 level of 800 μmol/mol. Additionally, different light regimes (diffusivity and transmissivity) were considered. With this model, annual photosynthesis was calculated on the basis of annual temperature and day lengths (derived by celestial mechanics). To obtain productivity of a whole deciduous broad‐leaved tree, the single leaf data were then upscaled by a canopy model. The results indicate that productivity was enhanced at both high latitude sites by elevated CO2, temperature of the growing season and high maximum daylength (24 h) during late spring and early summer. With productivity values about 30 % to 60 % higher as for a mid‐latitude continental European forest, the results indicate a potential for high productivity at the Eocene polar sites which is in the range of extant tropical forests. In contrast to speculations, no evidence for a selective advantage of large leaf size — as shown by various fossil leaves from high latitude sites — could be found.

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“…Frankenhäuser and Wilde 1993;Wilde andFrankenhäuser 1993, 1998), as well as the late Oligocene maar lakes of Enspel (e.g. Köhler and Uhl 2014;Uhl 2015;Uhl and Poschmann 2018), Rott (e.g. Mosbrugger 1996;Winterscheid et al 2018), and Kleinsaubernitz (e.g.…”

Section: Introductionmentioning

confidence: 99%

Menatanthus mosbruggeri gen. nov. et sp. nov. – A flower with in situ pollen tetrads from the Paleocene maar lake of Menat (Puy-de-Dôme, France)

Uhl

Paudayal

Hervet³

et al. 2020

Palaeobio Palaeoenv

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The Paleocene Fossil-Lagerstätte Menat in France is well known for its wealth of outstandingly well preserved fossil insects and plants. Despite being known for more than a century, the palaeoflora, which is regarded as typical for the late Thanetian by some authors, has largely been neglected since the 1940s. New excavations and surveys yielded exceptionally well-preserved plant material, including a minute, heptamerous flower bearing in situ pollen tetrads, comparable to tetrads of the modern ericacean genus Kalmia L, in its anthers. The only known modern ericacean genus which is characterised by heptamerous flowers is Bejaria Mutis ex L., a basal relative of the tribe Phyllodoceae within Ericaceae, which also includes the genus Kalmia in a relatively basal position. However, heptamerous flowers also occur very rarely (mostly interpreted as teratologies) in a number of other modern Ericaceae, but also in various other modern angiosperm families. Due to the unique combination of a heptamerous flower with Kalmia-type pollen tetrads within the anthers, the new taxon Menatanthus mosbruggeri gen. nov. et sp. nov. is erected. The lack of morphological data from the flower itself and the fact that comparable pollen tetrads can be produced by a number of modern families, however, prevent an assignment of the new taxon to any known angiosperm family.

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Groenlandia pescheri sp. nov. (Potamogetonaceae) from the Late Oligocene Fossil-Lagerstätte Enspel (Westerwald, Germany)

Cited by 9 publications

References 25 publications

<p><strong>Fossil dragonflies (Odonata: Anisoptera) from the late Oligocene Fossil-Lagerstätte Enspel (Rhineland-Palatinate, SW Germany)</strong></p>

<p><strong>Fossil dragonflies (Odonata: Anisoptera) from the late Oligocene Fossil-Lagerstätte Enspel (Rhineland-Palatinate, SW Germany)</strong></p>

High Productivity at High Latitudes? Photosynthesis and Leaf Ecophysiology in Arctic Forests of the Eocene

Menatanthus mosbruggeri gen. nov. et sp. nov. – A flower with in situ pollen tetrads from the Paleocene maar lake of Menat (Puy-de-Dôme, France)

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