A new horseshoe crab species, Limulus darwini, is described from the uppermost Jurassic (ca. 148 Ma) near-shore sediments of Kcynia Formation, central Poland. The only extant species polyphemus (Linnaeus) inhabits brackish-marine, shallow water environments east coast United States. Here it shown that there are no important morphological differences between Formation specimens and juvenile representatives genus Limulus. palaeoecological setting inhabited by trophic relationships crabs...

Abstract This study presents a detailed analysis of an exceptionally well-preserved articulated specimen the trilobite Trimerocephalus from Late Devonian Holy Cross Mountains in Poland. X-ray microtomography reveals oldest direct evidence for moulting episode known fossil record. The process as well associated features observed investigated are interpreted by comparison with extinct and extant Xiphosurida arthropods, which survived global P/T extinction among closest relatives trilobites. A...

Abstract The Fleming Fjord Formation (Jameson Land, East Greenland) documents a diverse assemblage of terrestrial vertebrates Late Triassic age. Expeditions from the turn 21st century have discovered many important fossils that form basis our current knowledge Greenlandic faunas. However, due to scarcity and incompleteness their insufficient study, understanding taxonomic diversity is hindered. Here, we report preliminary findings Polish-Danish expedition took place in 2014. Three areas were...

Although Western Europe has yielded numerous Jurassic turtle taxa, several represented by cranial material or complete skeletons, the fossil record of turtles remains scarce to north and east from Germany. some Late testudinates were historically described Poland, they were, thus far, fragmentary that never properly figured in detail. Therefore, very little is known about mid‐Mesozoic diversity region continent. A new pancryptodiran genus species, Owadowia borsukbialynickae , uppermost...

Synapsids are unique in having developed multirooted teeth and complex occlusions. These innovations evolved at least two lineages of mammaliamorphs (Tritylodontidae Mammaliaformes). Triassic fossils demonstrate that close to the origins mammals, mammaliaform precursors were "experimenting" with tooth structure function, resulting novel patterns occlusion. One most surprising examples such adaptations is present haramiyidan clade, which differed from contemporary mammaliaforms rows cusps on...

The ability to see and understand the three-dimensional structure of an investigated object plays a key role in studying fossil remains. All living organisms are formed three-dimensions, but unfortunately fossilization processes often reduce overall shape, making it difficult gather information about real appearance, functionality, inner structure. Here, using specimen brachiopod Tere bratula terebratula we demonstrate non-destructive technique for exploring 3-D internal use tomography...

Abstract Numerous well-preserved remains of a new limulid species from the Anisian-lower Ladinian (Middle Triassic) Tejra section southern Tunisia are described. Comparisons made with limulids Triassic deposits Europe and Australia. The specimens congeneric type Limulitella , but show some morphological differences. Here we describe tejraensis species, small semicircular prosoma, triangular opisthosoma, well-defined axial ridge, pleurae along both ridges opisthosoma. Tunisian fossils...

Abstract We report evidence of one the oldest known animal migratory episodes in form queues eyeless trilobite Trimerocephalus chopini Kin & Błażejowski, from Late Devonian (Famennian) central Poland. In addition, there is for two morphs this population, with nine segments and other ten. infer that these represent mass chains coordinated by chemotaxis, comparable to those observed modern crustaceans such as spiny lobsters, further suggest forms, which occur an approximately 1:1 ratio,...

Abstract Horseshoe crabs are archetypal marine chelicerates with an exceptionally long fossil record. Due to the historical nature of genus Limulus , which extends back Linnaeus’ descriptions, many horseshoe crab fossils were traditionally placed in and family Limulidae. Despite continued research into accurate placement species within Limulidae, a systematic outline characteristics that define limulid genera, specifically using exclusively dorsal characteristics, does not yet exist....

Here we briefly report on the discovery of a new Fossil‐Lagerstätte locality, Owadów‐Brzezinki quarry (central Poland), which exposes Late Jurassic (Late Tithonian) carbonate sediments with an extremely fossiliferous horizon lithographic‐type limestones. Numerous specimens horseshoe crabs were found in association enormously rich assemblage soft‐shelled bivalves Corbulomima obscura and Mesosaccella sp., remains various fishes marine reptiles, rare ammonites, crustaceans, land insects...

The organodetritic, sandy limestones of the Treskelodden Formation (Late Gzhelian to Early Artinskian) investigated in outcrops at Treskelen Peninsula, Hyrnefjellet mount and Polakkfjellet south Spitsbergen, contain rich foraminiferal assem− blages. Fifty eight species twenty three genera, including two new (Hemigordius hyrnefjelleti sp. nov. Midiella arctica nov.) have been identified. Three zones defined, with ages Late Asselian (Pseudofusulinella occidentalis), Sakmarian (Midiella ovata –...

Siltstone and sandstone beds of the Mount Wawel Formation (Eocene) contain trace fossils interpreted as insect resting traces arthropod trackways, latest determined Glaciichnium australis isp.nov.and cf.Pterichnus isp.Glaciichnium is included in a new ichnofamily Protichnidae, which embraces invertebrate trackways composed straight central trail(s) lateral tracks.The same deposits fragments plant stems growth position, delicate fern-like twigs leaves Nothofagus.Their deposition took place...

Abstract A rich collection of exceptionally preserved Lower Triassic fossil fish remains obtained during the Polish Spitsbergen Expedition 2005 includes many isolated teeth be− lieved to belong a saurichthyid actinopterygian. Stable isotope analysis (δ 13 C and δ 18 O) putative Saurichthys from Hornsund area (South Spitsbergen) acting as paleoenvironmental proxy has permitted trophic−level reconstruction comparison with other same location. The broader range values ob− tained for durophagous...

New microfossil and magnetostratigraphical data as well geochemical clay mineral weathering indices are documented from the uppermost Jurassic Owadów–Brzezinki palaeontological site in central Poland. The newly discovered chitinoidellid assemblage of lowermost part section previously middle assigned, respectively, to Dobeni Boneti Subzones Chitinoidellidae Zone. same succession is correlated magnetosubzone M20n.2n. new allow refinement Tithonian stratigraphical scheme including an assignment...

This study presents a detailed morphological analysis of new species belonging to the blind trilobite Trimerocephalus McCoy, 1849, T. chopini n. sp., based on exceptionally well preserved articulated specimens from Late Devonian (Early Famennian) Holy Cross Mountains in central Poland. The occurrence this taxon Kowala Quarry near Kielce has been reported previously, with often found single-file queues representing migratory behaviour that was followed by mass mortality event these...

ABSTRACT High resolution oxygen isotopes profiles of well-preserved uppermost Jurassic oyster shells and vertebrate (ichthyosaur fish) teeth from Central Poland were obtained using a microdrill an ion microprobe (SHRIMP IIe/MC). Internal variability δ18O values (-1.7 to 1.3‰ VPDB) collected the offshore interval studied section is greater than that determined previously bulk oysters. Relatively high oysters may be linked slight increase in salinity mid-Polish basin. Low co-occurring...

Abstract Several brachiopods which belong to the same genus Horridonia of late Early and early Late Permian age in Spitsbergen Poland, respectively, have been petrographically geochemically analysed verify seasonal variation stable carbon oxygen isotope values for palaeoclimatological implications. The specimens timanica from show distinct cyclicity reflective pattern, while those horrida Poland do not. These differences are explained by fact that former lived at high palaeolatitudes...