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Kuhl G.,Steinmann Institute for Geology | Poschmann M.,Generaldirektion Kulturelles Erbe RLP | Rust J.,Steinmann Institute for Geology
Geological Magazine | Year: 2013

A new sea spider (Arthropoda: Pycnogonida) from the Lower Devonian Hunsrück Slate (Germany) is described as Pentapantopus vogteli gen. et sp. nov. This is the fifth pycnogonid species known from this exceptional fossil Lagerstätte. The most conspicuous character of the new species is the presence of five pairs of walking legs. This character, in concert with a reduced abdomen, indicates a phylogenetic position of P. vogteli among the crown group pycnogonids. P. vogteli extends the knowledge of fossil pycnogonid body plans and underlines the significance of the Hunsrück Slate, as this locality shows the highest diversity of sea spiders for the entire fossil record so far. Copyright © Cambridge University Press 2013.

Schindler T.,Buro fur Palaontologie | Wuttke M.,Generaldirektion Kulturelles Erbe RLP
Palaeobiodiversity and Palaeoenvironments | Year: 2010

Lake Enspel was a deep lake which developed in a small trachytic caldera or Bims volcano. In normal times, the lake was meromictic and eutrophic and had no outlet. Background sedimentation together with periodical phytoplankton blooms led to laminated, undisturbed sediments that alternated with coarse mass flows and/or turbidites. During turnovers caused by these episodical sediment inputs, the lake became oligotroph. Mesophytic forest extended right down to the lake edge. Approximately, 230,000 years after the onset of lake sedimentation, a basaltic lava flow, caused by a nearby eruption, filled the lake up in a single event. © 2009 Senckenberg, Gesellschaft für Naturforschung and Springer.

Poschmann M.,Generaldirektion Kulturelles Erbe RLP | Schindler T.,Buro fur Palaontologie | Uhl D.,Senckenberg Forschungsinstitut und Naturmuseum
Palaeobiodiversity and Palaeoenvironments | Year: 2010

Almost two decades ago, the Generaldirektion Kulturelles Erbe Rheinland-Pfalz initiated annual field campaigns in order to investigate geological and palaeobiological aspects of the Fossil-Lagerstätte Enspel, an upper Oligocene crater lake. Since then, the fossil-bearing 'oilshale' became more and more exposed due to the removal of the overlying basalt, which is still being commercially exploited. This contribution briefly summarizes the current knowledge that accumulatedmainly within the last 20 years, gives a taxonomic listing of the fossil association, and includes a bibliography. © 2009 Senckenberg, Gesellschaft für Naturforschung and Springer.

Lamsdell J.C.,University of Kansas | Percival I.G.,Geological Survey of New South Wales | Poschmann M.,Generaldirektion Kulturelles Erbe RLP
Alcheringa | Year: 2013

The type (and only known) specimen of Melbournopterus crossotus Caster & Kjellesvig-Waering, an enigmatic late Silurian fossil that was initially assigned to the eurypterid family Stylonuridae, is critically examined for the first time in 60 years. It is reinterpreted as most likely the dorsal valve of a craniate brachiopod, with prominent paired adductor muscle scars (described originally as 'lateral eyes') situated anteromedially, a short hingeline and a spinose anterior margin. James C. Lamsdell [lamsdell@ku.edu], Department of Geology and Paleontological Institute, University of Kansas, 1475 Jayhawk Boulevard, Lawrence, KS 66045, USA; Ian G. Percival [ian.percival@industry.nsw.gov.au], Geological Survey of New South Wales, W.B. Clarke Geoscience Centre, 947-953 Londonderry Road, Londonderry NSW 2753, Australia; Markus Poschmann [markus.poschmann@gdke.rlp.de], Generaldirektion Kulturelles Erbe RLP, Direktion Landesarchäologie, Referat Erdgeschichte, Große Langgasse 29, D-55116 Mainz, Germany. Received 12.10.2012; revised 13.12.2012; accepted 26.12.2012. © 2013 Copyright Taylor and Francis Limited.

Wuttke M.,Generaldirektion Kulturelles Erbe RLP | Poschmann M.,Generaldirektion Kulturelles Erbe RLP
Palaeobiodiversity and Palaeoenvironments | Year: 2010

Lake Enspel was a deep lake which developed in a small trachytic caldera or a bims volcano. One of two finds of aquatic palaeobatrachid specimens from Enspel contains a fish prey as stomach content, which is described for the first time. At the critical time, the lake was meromictic, eutrophic, and without an outlet. The rarity of such finds of waterdwelling frogs is possibly due to the lake margin vegetation acting as some kind of taphonomic filter. © 2009 Senckenberg, Gesellschaft für Naturforschung and Springer.

Wedmann S.,Senckenberg Institute | Poschmann M.,Generaldirektion Kulturelles Erbe RLP | Hornschemeyer T.,University of Gottingen
Palaeobiodiversity and Palaeoenvironments | Year: 2010

Fossil insects can provide unique insights into evolutionary history, and their study has become increasingly important in recent decades. In this paper, we give an overview of the insect taphocoenosis from the upper Oligocene Enspel Lagerstätte (Germany) and discuss taphonomic similarities with other localities. Among the fossil insects identified, terrestrial groups are highly dominant, with march flies (Bibionidae) and weevils (Curculionoidea) being the most common groups; aquatic insects are rare. We provide a detailed survey of the represented taxa, including new records of a predaceous diving beetle (Dytiscidae), a soldier beetle (Cantharidae) and mayfly larvae (Ephemeroptera). Updated information on the ants (Formicidae) and reticulated beetles (Cupedidae) is reported. The palaeoclimatic and palaeobiogeographic inferences that can be drawn from the represented groups are discussed. Studies on the insects from Enspel indicate a warm temperate climate. Several records document that the distribution of many insect groups in the Oligocene was distinctly wider than it is today. © 2009 Senckenberg, Gesellschaft für Naturforschung and Springer.

Poschmann M.,Generaldirektion Kulturelles Erbe RLP | Dunlop J.A.,Humboldt University of Berlin | Bethoux O.,CNRS Center for Research on Palaeobiodiversity and Palaeoenvironments | Galtier J.,CIRAD - Agricultural Research for Development
Palaontologische Zeitschrift | Year: 2016

Trigonotarbids and scorpions (Arachnida: Trigonotarbida, Scorpiones) are described from the Upper Carboniferous (Late Stephanian/Late Gzehlian) of the Graissessac Basin in the Central Massif outcropping in southern France. This is the first record of trigonotarbids and the first thorough description of scorpions from this locality. Trigonotarbids are an extinct order and the new fossils express a distinctly ornamented dorsal surface and lobed carapaces implicit of the so-called ‘eophrynid-assemblage’; probably a derived clade. Although closest to Eophrynidae, the character combination preserved precludes unequivocal assignment to any of the currently recognized families, but appears to be unique among trigonotarbids and prompts us to propose the name Aenigmatarbus rasteli gen. et sp. nov. to accommodate these novel specimens. The Graissessac scorpions are preserved in dorsal view only, but two distinct morphotypes could be recognized. These are tentatively referred to here as two typical Coal Measures genera: namely the mesoscorpion Eoscorpius sp. and the more derived orthostern Compsoscorpius sp., respectively. © 2016 Paläontologische Gesellschaft

A Lower Devonian (Siegenian) eurypterid association from a particular mudstone layer in the Lahrbach Valley near Bürdenbach/Westerwald is described. It is dominated by a species of the adelophthalmoid Parahughmilleria. Based on the paddle morphology Eurypterus statzi Størmer, 1936 from the Siegenian of the Wahnbachtal is transferred here to Parahughmilleria as P. statzi n. comb. Despite being slightly older, the proportions of paddle segments in the Bürdenbach specimens more closely match those of P. hefteri from the Emsian of Alken. Therefore, they are tentatively assigned to this taxon but left in open nomenclature as P. cf. hefteri. Additional eurypterid remains probably represent adelophthalmoids as well, but are clearly distinguishable from Parahughmilleria. One specimen is comparatively well-preserved and deserves to be described and formally named here as Wiedopterus noctua n. gen. n. sp. In addition, rare remains of pterygotid eurypterids have been recorded. © 2015 Paläontologische Gesellschaft

Poschmann M.,Generaldirektion Kulturelles Erbe RLP | Dunlop J.A.,Humboldt University of Berlin
Palaontologische Zeitschrift | Year: 2010

New material of the trigonotarbids Alkenia and Archaeomartus from the Lower Devonian type locality Alken an der Mosel/Germany is described. Størmer's original description of Alkenia is essentially confirmed and supplemented. The genus is placed in Aphantomartidae. In contrast to earlier accounts, we show that Archaeomartus has an anterior diplotergite and a longitudinally three-divided posteriormost (ninth) tergite. The new family Archaeomartidae is proposed. Whether a marginal row of larger tubercles on the opisthosoma can be recognized is strongly influenced by the taphonomic history of the fossil, and sexual dimorphism may also be involved. Thus, we propose that Archaeomartus levis and A. tuberculatus, which can be discriminated solely by the presence or absence of this feature, are synonyms. Furthermore, morphological similarity suggests the possibility that archaeomartids, with their opisthosomal tergites divided into three plates, gave rise to the later (Carboniferous) anthracomartids, specifically through the division of the lateral plates and the ninth tergite. Finally, our reassessment of Archaeomartus shows that 'A.' roessleri Dunlop and Brauckmann, 2006 can no longer be adequately maintained in this genus. This younger species from the early Upper Carboniferous of Hagen-Vorhalle, Germany, is reassigned to Namurotarbus n. gen. as Namurotarbus roessleri n. comb. © 2010 Springer-Verlag.

Poschmann M.,Generaldirektion Kulturelles Erbe RLP | Dunlop J.A.,Humboldt University of Berlin
Palaontologische Zeitschrift | Year: 2012

Seven further specimens of the hitherto only known Devonian phalangiotarbid Devonotarbus Poschmann, Anderson and Dunlop, 2005 are described. Thus, the genus is recorded from four different localities of Siegenian (Hombach and Burglahr) and Lower Emsian (Willwerath and Alken) age, respectively, but the specific identity of Siegenian and Emsian specimens remains unproven. The new material suggests that this Devonian phalangiotarbid possessed more than six eye lenses, tergites five and six fused into a diplotergite, and an almost terminally situated anal operculum. It thus notably deviates morphologically from its younger Permocarboniferous relatives, and a new family, Devonotarbidae nov. fam., is proposed to accommodate Devonotarbus. © 2012 Springer-Verlag.

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