Figure: Shell of one of the described species Ypomonetikochelys euryaspis („a patient turtle with broad shields”) NHMD 1903049 (Natural History Museum of Denmark, University of Copenhagen; exposition at the Geocenter Møns Klint) in dorsal (top) and ventral (bottom) view.

Two new Triassic turtles from Greenland🐢🙂
1drv.ms/b/c/553c4757...
#geologia #paleontologia #paleontology #paleobiologia #paleobiology

Map of Denmark with the location of the studied sites and an illustration of an ammonite with explanations of morphological terms

Species concept in palaeontology 🙂
Figure: A. Danish localities which yielded studied ammonites of the Pachydiscus neubergicus group. B. Morphology and measurement of a P. neubergicus specimen.
journals.pan.pl/dlibra/publi...
#geologia #paleontologia #paleontology #paleobiologia #paleobiology

Idealized reconstruction of Polonolimulus zaleziankensis gen. et sp. nov. Reconstruction credit: Jonatan Audycki. https://doi.org/10.7717/peerj.20950/fig-11

Palaeobiogeography 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

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

Figure: Fieldwork in fjords of South Georgia.

Organic carbon burial in fjords of South Georgia 🙂
journals.sagepub.com/doi/10.1177/...
#geologia #paleontologia #paleontology #paleobiologia #paleobiology

At the origin of cowries 🐚🙂
doi.org/10.1017/S001...
#geologia #paleontologia #paleontology #paleobiologia #paleobiology

Antarctic Cretaceous and Paleogene crinoids 🙂
www.sciencedirect.com/science/arti...
#geologia #paleontologia #paleontology #paleobiologia #paleobiology

Figure: The horned sea star (left) has a skeleton with a “diamond” microstructure. Using various labeling and imaging techniques (middle panel), a model of stereom growth was proposed (right panel).

Morphogenesis of the echinoderm diamond-type stereom 🙂
www.sciencedirect.com/science/arti...
#geologia #paleontologia #paleontology #paleobiologia #paleobiology

Sharks as apex predators in the Late Cretaceous Western Interior Seaway empirically revealed by zinc isotope analyses Food web structures and trophic interactions among Late Cretaceous marine taxa remain largely ambiguous due to the challenges in reconstructing ecolog…

www.sciencedirect.com/science/arti...

Lead by Jeremy McCormack of @goetheuni.bsky.social, and with a miniscule contribution from me, we present geochemical evidence that sharks were marine apex predators since at least the Late Cretaceous. 🐟🦈🧪 #paleobiology #geochemistry

👀Got a #special interest? Dive into our #curated collections!
🧬From evolutionary #genomics and #paleobiology to speciation, #EvoDevo, and #conservation, we've got something for everyone!
📚Visit our topic-specific virtual #libraries today!
🔗 jse.ac.cn/EN/collections
🥰
@wileyecology.bsky.social

If paleobiology falls in your interest area, check out the “Paleobiology Database” at paleobiodb.org#/ . This database is well-resourced with more than 94,000 references, 517,852 taxa, 276,576 collections, and ~1,000 contributors. #Paleobiology #Organisms #HistoricalGeology

Macroevolutionaries: Reflections on Natural History, Paleontology, and Stephen Jay Gould. By Bruce S. Lieberman and Niles Eldredge. New York: Columbia University Press. $27.95. ix + 214 p.; ill.; inde...

Really appreciate this thoughtful review of #Macroevolution -aries, my and @nilese.bsky.social 's @columbiaup.bsky.social 📕 by @adrian-currie.bsky.social in @qrb.bsky.social doi.org/10.1086/738777 #paleobiology #palaeobiology #paleontology #palaeontology

Photographs (A–C) and CT-scans (D–G) of morphotype E. (A) The complete specimen with x-y being cross section in picture F. (B–C) Orthoceratoid cephalopod shell fragment seen in two different angles. Red arrows pointing to the same spot in both pictures. (B) Shell fragment seen from the top. (C) Shell fragment seen in cross section. (D–E) Orthoceratoid shell fragment with a length of 15.8 mm and visible chambers. (D) Outside of the shell fragment. (E) Underside of the shell fragment. (F) Orthoslice of onychites marked x-y in picture A. (G) Bone fragment. (A–F) PMO 250.281. (G) PMO 250.904. https://doi.org/10.7717/peerj.20746/fig-7

CT-scans (A, D, G–I) and thin sections (B–C, E–F) of morphotype A. (A1–A2) External and internal view of sub-morphotype A, PMO 250.270. (B) Tetrapod bone in thin section, PMO 250.004. (C) Fish vertebrae, PMO 250.009. (D1–D2) External and internal view of sub-morphotype A2, PMO 150.275. (E) Fish scale, PMO 249.999. (F) Degraded bone fragments, PMO 250.000. (G1–G2) External and internal view of sub-morphotype A3, PMO 250.273. (H) Burrows with a width of approximately 0.5 mm over a total area of three mm, PMO 250.530. (I) Conodont element measuring 1.22 mm in length, PMO 250.273. https://doi.org/10.7717/peerj.20746/fig-3

Photographs of the different morphotypes found in the Grippia bonebed, Svalbard. (A–B) morphotype A1 cigar. (C–E) morphotype A2 amphipolar. (F–G) morphotype A3 cylindrical with grooves. (H–J) morphotype B1 spiral rounded. (K–L) morphotype B2 teardrop. (M–N) morphotype C sub-rounded. (O-P) morphotype D reniform. (Q–S) morphotype E wide cylindrical.(A) PMO 250.847. (B) PMO 250.846. (C) PMO 250.275. (D) PMO 250.854. (E) PMO 250.858. (F) PMO 250.860. (G) PMO 250.530. (H) PMO 250.533. (I’-I”) PMO 250.864. (J) PMO 250.841. (K) PMO 250.869. (L) PMO 250.868. (M) PMO 250.271. (N) PMO 250.884. (O) PMO 250.886. (P) PMO 250.528. (Q) PMO 250.899. (R) PMO 250.897. (S) PMO 250.281. https://doi.org/10.7717/peerj.20746/fig-2

Digesting an ancient ecosystem: #coprolites from the Grippia #bonebed, Lower #Triassic, Svalbard

peerj.com/articles/207...

@peerj.bsky.social #paleobiology #paleontology #fossils

doi.org/10.7717/peer...

7000 years of turnover: historical contingency and human niche construction shape the Caribbean's Anthropocene biota Abstract. The human-mediated movement of species across biogeographic boundaries—whether intentional or accidental—is dramatically reshaping the modern wor

Congratulations to Jenna Wadman (class of 2020) on her paper, co-authored with Melissa Kemp (Assoc Prof, IB), exploring how humans have reshaped #biodiversity in the Caribbean for 7,000 years. Read the paper: shorturl.at/YXvfQ #paleobiology

Bizarre 400-million-year-old fossil was an unknown life form Enigmatic organism known as Prototaxites cannot be fungus, new analysis finds

Bizarre 400-million-year-old fossil was an unknown life form
Enigmatic organism known as Prototaxites cannot be fungus, new analysis finds
#paleobiology
www.science.org/content/arti...

How a Global Freeze 445 Million Years Ago Changed Life Forever One of Earth’s earliest mass extinctions wiped out most ocean life during a sudden global ice age. From the ruins, jawed vertebrates survived, diversified, and transformed the course of evolution. About 445 million years ago, Earth experienced a sudden and dramatic shift that altered the course of life. In a very short span of geological [...]

Exploring the influence of cameral deposits on the stability, orientation, and maneuverability of orthocone cephalopods | Paleobiology | Cambridge Core Exploring the influence of cameral deposits on the stability, orientation, and maneuverability of orthocone cephalopods

www.cambridge.org/core/journal...

🧪 #paleobiology #cephalopod #FossilFriday

A 3D digital model of the petrosal bone of a 33 million year old ancient camel from North America (specimen number FMNH UC 394). The petrosal is a bone in the back of the skull that contains the organs of hearing and balance in life. for specialists: A 3D digital model of the petrosal bone (which encapsulates the inner ear) of Poebrotherium wilsoni, a 33 Ma old camelid from North America (specimen number FMNH UC 394).

IOB - Watch this incredible #3D digital model of the petrosal #bone of a 33 million year old ancient camel from North America (specimen number FMNH UC 394).

youtu.be/s3iZDPnAE34

from
doi.org/10.1093/iob/...

SV Robson, @jmtheodor.bsky.social et al

#fossils #ear #paleobiology #science

Rycina: Shell of gastropod Desbruyeresia marisindica from Kairei hydrothermal vents in the Indian Ocean, covered with inorganic coatings (A), with cross section through this shell showing morphology of inorganic coatings (B) and close-up on a fragment showing structure and shell/coating spatial relations (C). Distribution of some elements (oxygen, manganese, calcium, iron, copper, and phosphorus) in a fragment of coating illustrated in (C) is shown in lower two rows.

Coatings on shells from hydrothermal vents 🐚🙂
www.nature.com/articles/s41...
#geologia #paleontologia #paleontology #paleobiologia #paleobiology

Figure: A schematic section through shallow seabed showing the effects of methane-derived carbonate cementation. Cements form at or close to the seabed where worm tubes (A) and bivalve shells (B) occur, or in deeper parts of the subsurface where concrections (C) form.

Methanogenic carbonates 🙂
www.sciencedirect.com/science/arti...
#geologia #paleontologia #paleontology #paleobiologia #paleobiology

Rycina: Ammonite specimens representing the genera Baculites (a, b, e, f), Fresvillia (c, d), and Hoploscaphites (g) from lower Danian deposits exposed at Stevns Klint, Denmark (see Fig. 3 in Machalski et al. 2025). Prasinophytes belong to the green algae.

Ammonites survived cross the Cretaceous–Paleogene boundary 🙂
www.nature.com/articles/s41...
#geologia #paleontologia #paleontology #paleobiologia #paleobiology

Figure: Various microstructures of Spirotubus carbonate skeletons under a scanning microscope.

Enigmatic microfossils from southern Poland 🙂
www.scup.com/doi/10.18261...
#geologia #paleontologia #paleontology #paleobiologia #paleobiology

IOB
Resolving #evolutionary relationships-
IOB’s Selina-Viktor Robson details more about their co-authored work

iobopen.com/2026/01/12/r...

& read the paper
doi.org/10.1093/iob/...
by Robson, @jmtheodor.bsky.social et al

#science #fossils #paleobiology #morphology #taxa, #ontogeny.

Figure: Calcispheres (a kind of calcareous microfossils) from Sosnowiec IG-1 core with preserved organic matter. A–B. Volvocacean calcispheres with preserved cells forming a colony; C–D. Radiospherid (spinose) calcispheres with highly mineralized mucous envelopes around single-celled algae. Scale A the same for B and D. The central chamber of the calcisphere is typically between 30 and 50 µm.

Life in a Devonian marine lagoon 🌊🙂
www.sciencedirect.com/science/arti...
#geologia #paleontologia #paleontology #paleobiologia #paleobiology

Paleodiet reconstructions and human utilization of middle Holocene Equus ferus in northwest Europe This study uses tooth meso- and microwear together with bone collagen stable isotope ratios (carbon (δ13C), nitrogen (δ15N), and sulphur (δ34S)) to in…

Our work on the nearby-find of late-surviving #horses of the native Central European phylogroup: Paleodiet reconstructions and human utilization of middle #Holocene Equus ferus in northwest Europe🐎🐎www.sciencedirect.com/science/article/pii/S003... #toothwear #isotopes #paleobiology

A series of blockdiagrams illustrating the development (from the phase 1 to phase 3) of the Ploužnice Lake as interpreted from the studied sections (Kyje–Ploužnice railway cut, Štikov roadcut) and data on the Ploužnice Horizon by Blecha et al. (1997). The alternation of wet and dry climate phases that controlled the extent of the Ploužnice Lake, has already been interpreted from contemporaneous deposits of the Líně Formation in central Bohemia (Nádaskay et al., 2025). Close-ups provide a detailed interpretation of the depositional environment in which the trackmakers roamed and left their trace fossils.

A highly diverse Pennsylvanian #tetrapod ichnoassemblage from the Semily Formation (Krkonoše Piedmont Basin, Czechia)

peerj.com/articles/204...

@peerj.bsky.social #ichnology #paleontology #paleobiology

Fossil freeloaders: Rare evidence of parasitism in Ordovician Trilobites « Earth & Environmental Science# « Cambridge Core Blog A new study of from the Middle Ordovician of Estonia reveals some of the earliest evidence for parasitism in the fossil record. Olev Vinn at the University of Tartu and colleagues argue that dome and ...

www.cambridge.org/core/blog/20...

A blog post on our article: dx.doi.org/10.1017/jpa.2025.10190

#Paleobiology #Trilobites #Paleoparasitology #Paleopathology

Punctuated equilibria at 50: half a century of stasis, cladogenesis, and macroevolutionary insights | Paleobiology | Cambridge Core Punctuated equilibria at 50: half a century of stasis, cladogenesis, and macroevolutionary insights - Volume 51 Issue 4

Here is our introductory paper to the Paleobiology special volume @paleosoc.bsky.social celebrating the 50th anniversary of #punctuatedequilibria #macroevolution #paleobiology #palaeontology #paleontology @nilese.bsky.social www.cambridge.org/core/journal...

Latest issue | Paleobiology | Cambridge Core Paleobiology

Really excited to have the new issue of Paleobiology @paleosoc.bsky.social out celebrating the 50th anniversary of #punctuatedequilibria #macroevolution #paleobiology #palaeontology #paleontology @nilese.bsky.social www.cambridge.org/core/journal...

Last Thursday @palaeoverse.bsky.social I shared some of our recent projects, exploring the application of phylogenetic methods and the exciting new wave of Bayesian diversification models.

#paleobiology #paleontology #macroevolution

youtu.be/vd-E4E6iFNg?...

Figure: Probable journey of the erratic boulder by rivers from Thuringia (Frankenwald) to the North Sea, and then to England. Palaeogeographic reconstruction for th Pleistocene epoch. Below the pebble itself, with the graptolite visible on the right-hand side.

Silurian erratic boulder travelling from Thuringia to England
www.paleo.pan.pl/files/mate/i...
#geologia #paleontologia #paleontology #paleobiologia #paleobiology