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Jonatan Audycki

@jaudycki.bsky.social
64 followers 118 following 2 posts

PhD student at @ibe-warszawa.bsky.social | Arthropod Palaeobiology & Evolution | Horseshoe crabs | Trilobites | Triassic | Tea

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Jonatan Audycki @jaudycki.bsky.social · 25/03/2026
My first PhD paper is out! Thanks Kenneth, Russell and Grzegorz for all your help and support!
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Reposted by Jonatan Audycki
Kenneth De Baets @djbirddanerd.bsky.social · 25/03/2026
A new #Triassic austrolimulid from #Poland presents insight into xiphosurid evolution and palaeobiogeography at the dawn of the Mesozoic led by @jaudycki.bsky.social and with @grzegorzniedz.bsky.social: peerj.com/articles/209... @peerj.bsky.social #paleobiology #evolution
Idealized reconstruction of Polonolimulus zaleziankensis gen. et sp. nov.
Reconstruction credit: Jonatan Audycki. https://doi.org/10.7717/peerj.20950/fig-11Palaeobiogeography of Triassic horseshoe crabs.
Palaeogeography of the world is reconstructed at 245 Ma (Anisian, Middle Triassic) and displayed using Mollweide projection, with a close-up of the Central European Basin System. The extents of shallow seas (light blue), landmasses (pale yellow) and mountain ranges (orange) are reconstructed based on Cao et al. (2017). Symbols represent Triassic localities that have yielded horseshoe crab fossils, their ages, and taxonomic assignment. The palaecoordinates of the xiphosurid localities are also reconstructed at 245 Ma for consistency. Simplified reconstructions of austrolimulids are displayed for context and comparison: 1–Polonolimulus zaleziankensis from the Lower Triassic (uppermost Induan/lowermost Olenekian) Zalezianka-Gózd locality, Poland; 2–Psammolimulus gottingensis from the Lower Triassic (Olenekian) Solling Formation, Germany; 3–Batracholimulus fuchsbergensis from the Upper Triassic (Norian/Rhaetian boundary) Exter Formation, Germany; 4–Attenborolimulus superspinosus from the Lower Triassic (upper Olenekian) Petropavlovka Formation, Russia; 5–Vaderlimulus tricki from the Lower Triassic (lower Spathian, Olenekian) Thaynes Group, USA; 6–Austrolimulus fletcheri from the Middle Triassic (lower Anisian) Beacon Hill Quarry, Hawkesbury Sandstone, Australia; 7–Dubbolimulus peetae from the Middle Triassic (lower Anisian) Ballimore Formation, Australia; 8–Tasmaniolimulus patersoni from the Lower Triassic (lower Induan) Jackey Shale, Tasmania (Australia). Since the investigated xiphosurid localities differ stratigraphically, their geographical position relative to continental boundaries and shallow seashores are approximated. The display window on the map showing close-up boundaries is not square due to employed map projection. For the full list of investigated localities along with their current and reconstructed palaeocoordinates and temporal data. https://doi.org/10.7717/peerj.20950/fig-10 PCA plot of the Triassic horseshoe crabs using prosomal data only.
TPS grids show deformation between the average and the minimum and maximum landmark coordinates for PC1 and PC2. Convex hulls for Austrolimulidae (red) and Limulidae (light blue) are plotted in two alternative ways: solid lines for the inclusion of Limulitella is in Limulidae, and dashed lines if Limulitella is included within Austrolimulidae. Outlines of the specimens used in the analysis are shown above the plot: 1–AM F38274 Austrolimulus fletcheri, 2–gz4142 (latex peel of the holotype Muz. PGI 1808.II.10) Polonolimulus zaleziankensis, 3–UCM 140.25 Vaderlimulus tricki, 4–MMF 27693 Dubbolimulus peetae, 5–GZG.INV.45730a Psammolimulus gottingensis, 6–PIN 5640/220 Attenborolimulus superspinosus, 7–UNISTRA.2015.0.50968 Limulitella bronni, 8–LIM 68 L. bronni, 9–ZPAL V.46/101 Limulitella tejraensis, 10–PMSL T-993 Sloveniolimulus rudkini, 11–MGSB M 262 Tarracolimulus rieki, 12–MGSB 19195 Heterolimulus gadeai.: 13–MAN 8240 Keuperlimulus vicensis, 14–ZPAL V.46/120 Limulitella tejraensis, 15–MB.A.0207 Limulidae indet. (‘Limulus kieri’), 16–ZPAL V.46/106 L. tejraensis, 17–SNSB-BSPG 1967 XVI 27 Limulitella cf. liasokeuperinus, 18–ZPAL V.46/103p L. tejraensis , 19–UTGD 123979 Tasmaniolimulus patersoni. Outlines are not to scale. https://doi.org/10.7717/peerj.20950/fig-9
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Jonatan Audycki @jaudycki.bsky.social · 14/01/2026
A month ago I had a great time in Portsmouth presenting my research and networking at #PalAss25! Big thanks to my supervisors and co-authors, and to @ncn.gov.pl for funding my work. Also thanks @darjadankina.bsky.social for taking the picture! @ibe-warszawa.bsky.social @thepalass.bsky.social
Jonatan Audycki standing in front of the title slide of his presentation titled "Exploring the supposed freshwater Mesozoic xiphosurids"
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