Tessera

PARADIVE UW

@paleoparadive.bsky.social

team @IBE_Warszawa focused on the impact of extinction and climate warming on parasite-host interactions and disease in deep time. https://www.paradivelab.com/ Avatar by Franz Anthony

10 Posts88 Follower 134 Folgt

PARADIVE UW @paleoparadive.bsky.social · 2w ago

Pawel Olszewski succesfully defended his thesis on Using #molecular #cophylogenetic methods to estimate #extinction risk on ascaridoid #Nematoda @wbuw.bsky.social @ibe-warszawa.bsky.social supervised by @djbirddanerd.bsky.social

Student and supervisor after the Master defence

PARADIVE UW @paleoparadive.bsky.social · 2w ago

🦠 We're hiring a 2-year postdoctoral researcher at the Institute of Evolutionary Biology, University of Warsaw, to join the PARADIVE lab: euraxess.ec.europa.eu/jobs/469223

Assistant Professor (post-doc) - Faculty of Biology, University of Warsaw (WB-KG-15/2026)

The position of Assistant Professor in the programme/project/undertaking The impact of mass extinctions on parasite diversity and evolution.

euraxess.ec.europa.eu

Kenneth De Baets @djbirddanerd.bsky.social · 2w ago

Reassessment of #Miocene putative #coprolites from Poland suggests a biogenic origin and probable #squamate (reptilian) producers: peerj.com/articles/217... @peerj.bsky.social supported by size/morphology, surface striations, hair-like inclusions and associated putative reptile remains #paleobiology

Six Miocene coprolite fossils (A–F) shown alongside modern reptile faeces (G–L) for comparison. The fossils are irregular, flattened, dark-brown masses; specimen C has a distinctive striated surface texture. The modern samples come from an iguana, a Madagascar boa, a boa snake, and a tortoise, appearing as similar brownish, segmented or lumpy droppings. Panels M and N are microscope photos of hair-like structures inside specimen A, each marked with a yellow line showing the thin-section cut. Scale bars: 1 cm for the specimens, 100 µm for the microscope views. See: https://doi.org/10.7717/peerj.21755/fig-2

A grid of small vertebrate fossils from Bełchatów, Poland (scale bars 1 mm). Highlighted putative reptile finds: A, a possible reptile tooth crown shown from two sides; B, a crocodile tooth, slender and pointed; G, a rounded osteoderm (bony skin plate) in dorsal and ventral view; and N, a putative squamate bone fragment shown in three orientations. The remaining panels show mammal and amphibian remains: bat and hedgehog teeth, a possible frog bone, rodent incisors, and numerous mole and shrew-like insectivore teeth (Desmanella, Plesiosorex, Talpinae, Plesiodimylinae), plus a lagomorph tooth and a desman molar. Scale bars: 1 mm. 10.7717/peerj.21755/fig-3

Thin-section and electron microscope images of probable coprolites from Bełchatów, Poland. A and B show entire thin sections of two coprolites — pale, elongate slices with darker internal material. C and D are optical microscope views of the coprolite matrix; E and F are backscattered electron images of the same, showing scattered pale inclusions in a darker groundmass. G, H, and I are SEM close-ups revealing clusters of siderite and iron oxides/hydroxides — granular, bright mineral aggregates labelled "Sd" and "FeO(OH)" — in the coprolite matrix. https://doi.org/10.7717/peerj.21755/fig-5

Kenneth De Baets @djbirddanerd.bsky.social · last mo.

#Cephalopod #paleobiology and #evolution: new #insights, rising #problems, and #perspectives: doi.org/10.1017/jpa.... #paleontology #fossils #ammonoids #coleoids #nautiloids #openaccess

Cephalopod paleobiology and evolution: new insights, rising problems, and perspectives | Journal of Paleontology | Cambridge Core

Cephalopod paleobiology and evolution: new insights, rising problems, and perspectives

doi.org

Kenneth De Baets @djbirddanerd.bsky.social · last mo.

Interpreting Biotic Interactions in the Fossil Record: Evidence and Evolutionary Significance #paleobiology #paleobiology #fossils #ecology #evolution #EarthHistory #biodiversity

Interpreting Biotic Interactions in the Fossil Record: Evidence and Evolutionary Significance

Fossil biotic interactions (fBIs) provide a critical but underutilized window into the ecological and evolutionary dynamics of life through time. Unlike modern ecological data, the fossil record captu...

doi.org

Kenneth De Baets @djbirddanerd.bsky.social · 2mo ago

Cieplejsze oceany, mniejsze zwierzęta. Przełom w badaniach nad efektem Liliputa

Cieplejsze oceany, mniejsze zwierzęta. Przełom w badaniach nad efektem Liliputa - Serwis Naukowy UW

Gdy oceany się ogrzewają, niektóre zamieszkujące je organizmy stają się mniejsze. Najnowsze badania pokazują, że ten zapisany w skamieniałościach wzorzec powtarza się od setek milionów lat. Czy powinn...

serwisnaukowy.uw.edu.pl

Kenneth De Baets @djbirddanerd.bsky.social · 2mo ago

The timescale of #nematode #evolution reveals late and convergent radiations of #parasitism: dx.doi.org/10.1038/s415... You should be able to access it here: www.researchgate.net/publication/... #Fossils #Evolution #Parasites #Genomics #Nematodes

The timescale of nematode evolution reveals late and convergent radiations of parasitism - Nature Ecology & Evolution

Establishing a universal evolutionary timescale of nematodes has been complicated by their patchy fossil record and analytical limitations. Combining genomic data from 156 nematode species with fossil...

dx.doi.org

franz @franzanth.bsky.social · 2mo ago

I recently did a cover illustration that didn't make it, but go read the paper if you're interested! It's really fascinating. #Art #SciArt

dark illustration showing a raven and an otter circling around a glowing circle with a nematode inside

Kenneth De Baets@djbirddanerd.bsky.social · 2mo ago

Philip Donoghue @phil-donoghue.bsky.social · 3mo ago

Our latest: The timescale of nematode evolution reveals late and convergent radiations of parasitism. Led by Liang Lü, with help from @djbirddanerd.bsky.social Mattia Giacomelli @meleonora-rossi.bsky.social Oleksandr Holovachov, Davide Pisani and myself www.nature.com/articles/s41...

The timescale of nematode evolution reveals late and convergent radiations of parasitism - Nature Ecology & Evolution

nature.com

Kenneth De Baets @djbirddanerd.bsky.social · 4mo ago

🧵 NEW DISCOVERY: Two new types of #tapeworm eggs found in a #Permian shark #coprolite from Brazil! This record pushes back the fossil record of complex parasite life cycles and is a crucial aspect of understanding host-symbiont #coevolution. #Paleontology #Parasites dx.doi.org/10.4202/app.01294.2025

Multiple records of tapeworm eggs from Permian coprolites and their palaeoparasitological significance - Acta Palaeontologica Polonica

dx.doi.org

Kenneth De Baets@djbirddanerd.bsky.social · 4mo ago

#Multiple records of #tapeworm eggs from #Permian #coprolites and their palaeoparasitological significance: dx.doi.org/10.4202/app.01294.2025 #Platyhelminthes, #Cestoda, #bromalite, #palaeoparasitology, Rio do Rasto Formation, #Permian, #Paraná Basin #Paleobiology #Fossils

Close-up of spherical inclusions type A1 in PV 634-P thin section. Shark coprolite from Coproland, Brazil, Rio do Rasto Formation, Guadalupian (middle Permian). Panel A: Cluster of subspherical bodies interpreted as tapeworm eggs within a cocoon. Panel B: Single spherical body showing three pairs of hook-like structures and a distinct outer shell surrounded by others. Includes petrographic microscope photos and interpretative drawings. More information in Dentzien-Dias et al. 2026,
Acta Palaeontologica Polonica 71 (2), 2026: 323-335 doi:10.4202/app.01294.2025

Kenneth De Baets @djbirddanerd.bsky.social · 4mo ago

Close-up of spherical inclusions type A2 in PV 634-P thin section, shark coprolite from Coproland, Brazil, Rio do Rasto Formation, Guadalupian (middle Permian). Shows isolated spherical bodies interpreted as tapeworm eggs. Includes Keyence HX-7000 photo and interpretative drawing. More information in Dentzien-Dias et al. 2026, Acta Palaeontologica Polonica 71 (2), 2026: 323-335 doi:10.4202/app.01294.2025

Hypothetical reconstruction of tapeworm parasite life cycles from shark coprolites, Coproland, Brazil, Rio Do Rasto Formation, Guadalupian (middle Permian). Filled arrows show direct evidence, stippled arrows indicate less certain connections, and possibilities from circumstantial inference are discussed in text. Panels: A) Conchostracan as possible first intermediate host; B) Bony fish as second or first intermediate host; C) Tapeworm egg development in host muscle tissue; D) Shark with spiral intestine as definitive host; E) Defecation; F) Tapeworm eggs in faeces preserved as mineralized coprolites. More information in Dentzien-Dias et al. 2026, Acta Palaeontologica Polonica 71 (2), 2026: 323-335 doi:10.4202/app.01294.2025

Kenneth De Baets @djbirddanerd.bsky.social · 4mo ago

Unique fingerprint of marine ectotherm body size change during hyperthermal crises: doi.org/10.1073/pnas... #Lilliputeffect | #extinction | #hyperthermal | #climatechange | #bodysize

Unique fingerprint of marine ectotherm body size change during hyperthermal crises | PNAS

The term “Lilliput Effect” describes a substantial decrease in the average body size of fossil assemblages during major environmental perturbations...

doi.org

Kenneth De Baets @djbirddanerd.bsky.social · 4mo ago

🌀 Beyond preservation: morphological analysis of Lower #Jurassic serpenticone #ammonoids The family serves as a crucial model for studying serpenticone morphology across various taxa. 📄 DOI: doi.org/10.18261/let... #Paleontology #Ammonoids #Stratigraphy #Paleobiology #Geology #Mesozoic

Beyond preservation: morphological analysis of Lower Jurassic serpenticone ammonoids

The Lower Jurassic family Echioceratidae comprises ammonoids crucial for upper Sinemurian biostratigraphy and is a good model for studying the serpenticone morphology present in a wide variety of grou...

doi.org

Kenneth De Baets @djbirddanerd.bsky.social · 4mo ago

Acrothoracican bioerosion as evidence of Early Cretaceous barnacles (Cirripedia) in northwestern Gondwana @peerj.bsky.social peerj.com/articles/21433 #MarineBiology #Paleontology

Shell of the gryphaeid Ceratostreon boussingaulti.
(A) Left valve in ventral view. (B) Left valve in anterior view. (C) Right valve and umbo in dorsal view. (D, E) Close-up views of the borings of UR-CP-0585 cf. Rogerella. (E, F) Color maps of the borings of UR-CP-0585 cf. Rogerella showing the depth of the chambers. Abbreviations: H, high; L, low. Scale bar applies for (A)–(C).

Details and 3D volume reconstruction of UR-CP-0585 cf. Rogerella borings.
(A) Three-dimensional model of the shell of the gryphaeid Ceratostreon boussingaulti in ventral view, red rectangle indicates the area with the highest concentration of borings. (B, C) Close-up of the borings showing their overlap, close proximity, and the largest boring observed. (D, E) Micro-CT internal view and volume reconstruction of the chambers of cf. Rogerella (MorphoSource Media 000790704) with institutional catalog number UR-CP-0585 (F) Micro-CT reconstruction of the largest of the borings of UR-CP-0585 cf. Rogerella in apertural view. (G) Micro-CT reconstruction of the largest of the borings of UR-CP-0585 cf. Rogerella in transverse view. (H, I) Close-up of the borings of UR-CP-0585 cf. Rogerella indicating the numbering of at least 26 borings for which the length and width of the aperture were measured. Abbreviations: D, depth; L, length; W, width. Scale bar 2 cm applies to (H) and (I).

Kenneth De Baets @djbirddanerd.bsky.social · 4mo ago

A new genus of #giant #salamander (Urodela, Cryptobranchidae) from the #Pliocene of #Japan - peerj.com/articles/213... @peerj.bsky.social #Paleontology #Taxonomy #Zoology #Fossils #Herpetology

Holotype fossil specimen LBM0142000335 of the newly described species Limnospondylus ajimuensis, shown in five anatomical views.

The image displays a vertebral fossil in dorsal (top-down), lateral (side), ventral (bottom), anterior (front), and posterior (back) views. Panel F provides a close-up of the zygapophyseal articular surface alongside an interpretative line drawing. Panel G shows CT scan cross-sections from anterior and posterior sections.

Red arrows highlight three diagnostic features: (1) strongly laterally elongated prezygapophyses, (2) broadly expanded and robust prezygapophysis bases, and (3) nearly straight alignment of the left and right transverse process ventral margins. The lateral view image is horizontally flipped to display opposite-side morphology. Scale bar indicates 2 cm.

Abbreviations used: ac (anterior canal), aco (anterior cotyle), cf (central foramen), fap (facies articularis prezygapophysialis), na (neural arch), nc (neural canal), pco (posterior cotyle), psz (postzygapophysis), prz (prezygapophysis), tp (transverse process), zgr (zygapophyseal growth rings). https://doi.org/10.7717/peerj.21362/fig-2

Scatter plots displaying Principal Component 1 (PC1) and Principal Component 2 (PC2) scores derived from a geometric morphometric analysis of trunk vertebrae.

Panel (A) shows the analysis based on the left lateral view of the vertebrae, while Panel (B) displays results from the dorsal half view. The plot distinguishes three groups using specific markers: a red star represents the Ajimu specimen (Limnospondylus ajimuensis), circles represent the extant species Andrias japonicus, and triangles represent Cryptobranchus alleganiensis. The distribution of these points illustrates the morphological variation and clustering among the fossil and modern salamander taxa. https://doi.org/10.7717/peerj.21362/fig-5

Graph comparing the ratio of centrum length to centrum height across living and extinct cryptobranchid salamander species.

The chart plots CL/CH ratios for both extant (currently living) and fossil specimens of the cryptobranchid salamander family, allowing comparison of vertebral proportions between modern and ancient species. https://doi.org/10.7717/peerj.21362/fig-4

PARADIVE UW @paleoparadive.bsky.social · 6mo ago

doi.org/10.7717/peer...

Body reconstruction and size estimation of plesiosaurs

Background Plesiosaurs were a clade of Mesozoic aquatic reptiles exhibiting high diversity in neck length. Although their body sizes have long attracted scientific and public attention, mass estimates...

doi.org

Kenneth De Baets@djbirddanerd.bsky.social · 6mo ago

#Body reconstruction and #size estimation of #plesiosaurs by Ruizhe Jackevan Zhao: peerj.com/articles/21146 in @peerj.bsky.social relevant to #EvolutionaryStudies #MathematicalBiology #Paleontology #Zoology

he workflow for establishing a hybrid framework to estimate body mass in plesiosaurs.
(A) Acquire data from fossil specimens (illustrated here using the modified image of Sachicasaurus vitae, Paramo-Fonseca, Benavides-Cabra & Gutierrez, 2018, CC BY 4.0). (B) Create lateral-view silhouettes of skeletal elements. (C) Estimate the dimensions of missing fossil elements through regression formulae and/or comparisons with closely related taxa. (D) Reconstruct the main body axis, including the dimensions and shape of the skull and vertebral column. (E) Reconstruct the ribcage in both lateral view and transverse cross-sections jointly, then restore the soft-tissue outlines of the main body axis and the flippers. (F) Estimate the body mass using the cross-sectional method (Zhao, 2024). (G) Establish body mass equations from the mass estimates of multiple species. Elements in this figure are not to scale. https://doi.org/10.7717/peerj.21146/fig-1

Dr. Or M. Bialik |📚|🔬|🌊|⚒️@obialik.bsky.social · 7mo ago

So we found a weird mold in the Chornobyl Exclusion Zone that seems to be doing something like photosynthesis with ionizing radiation (pos. using melanin). So the natural next stage in trying to understand it - is to send it to space! 🧪 Link: www.frontiersin.org/journals/mic...

Cladosporium sphaerospermum. Macro-and micromorphological characters. A-D. Colony surface grown on PDA (A), OA (B), MEA (C) and MEA plus 5 % NaCl (D) of strains incubated for 14 d at 25 ºC in darkness. E-F. Habit of conidiophores. G-I. Ramoconidia and conidia. E-I. All from 7-d-old SNA slide cultures. A, C-D, F-H, from CBS 193.54 (ex-neotype strain); B, from EXF-738; E, EXF-455; I, EXF-458. Scale bars A-D = 10 mm; E = 100 µm; F = 50 µm; G-I = 10 µm.

Source: https://www.ingentaconnect.com/content/wfbi/sim/2007/00000058/00000001/art00009;jsessionid=ukvexe675r98.x-ic-live-02

Kenneth De Baets @djbirddanerd.bsky.social · 7mo ago

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-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

Gwen Pearson @bug-gwen.bsky.social · 7mo ago

Yes, seals have lice! Under water, lice close their spiracles and reduce their oxygen consumption to a minimum www.nature.com/articles/s42...

Host-parasite coevolution leads to underwater respiratory adaptations in extreme diving insects, seal lice (Lepidophthirus macrorhini) - Communications Biology

Seal lice survive deep-sea dives by closing spiracles, reducing oxygen use, and breathing through their skin. Genomic data suggest they store oxygen via haemoglobin, showing insects can adapt to extre...

nature.com

Biodiversity Heritage Library @biodivlibrary.bsky.social · 8mo ago

🎉 Huge news for BHL: The Field Museum is taking over the hosting of BHL’s website, servers & infrastructure, ensuring long-term stability and access for its 63+ million pages of open biodiversity literature. Learn more: blog.biodiversitylibrary.org/2026/02/tran... #BHLTransition #ILoveBHL 🌍 📚 🧪

An historic black and white illustration of a paper nautilus floating on the ocean. There are boats, a city and hills in the background.

Joseph W. BRRRAAAIIINNNSSS @josephwb.bsky.social · 8mo ago

Limitations of molecular dating using constant birth-death rate priors in deep time reflected in Brachiopoda evolution www.sciencedirect.com/science/arti...

Limitations of molecular dating using constant birth–death rate priors in deep time reflected in Brachiopoda evolution

Molecular dating often struggles to align with fossil records when divergence times are estimated in deep evolutionary history, particularly during th…

sciencedirect.com

Kenneth De Baets @djbirddanerd.bsky.social · 7mo ago

Differences in #extinction selectivity and their relationship to functional traits in late #Cenozoic #mollusks peerj.com/articles/207... @peerj.bsky.social #Paleontology #Evolution #Conservation

Differences in extinction selectivity and their relationship to functional traits in late Cenozoic mollusks

Identifying generalizable patterns of extinction selectivity is crucial for understanding the mechanisms driving extinction processes. Differences in the trait composition of extinct surviving species...

peerj.com

Alexander Lees @alexanderlees.bsky.social · 8mo ago

Periodic reminder that moa de-extinction could lead to net biodiversity loss due to conservation deprioritisation of extant species. The (re)introduction process of any resultant genetically-modified Emus will very expensive www.nature.com/articles/s41... #Ornithology

Spending limited resources on de-extinction could lead to net biodiversity loss - Nature Ecology & Evolution

Use of public funding for conservation of resurrected species would lead to fewer extant species that could be conserved, and consequent net biodiversity loss.

nature.com

Mike Dickison@adzebill.bsky.social · 8mo ago

Apparently faux-moa will be browsing generalists and help restore NZ's impenetrable bush back to what it was 800 years ago. (Paul admitted moa were not actually deer though.) But they'll also be in captivity, so go figure.

Ecological Healing slide claiming moa functioned like deer or antelope (they didn't) and dispersed seeds in their poo (latest gizzard-replication experiments suggest they didn't—ask ChatGPT to make you a new slide please).

Kenneth De Baets @djbirddanerd.bsky.social · 8mo ago

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...

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

Hassan Salem @hassansalem.bsky.social · 8mo ago

How specific are heritable symbioses? And what can we learn from swapping obligate symbionts across host species? We address this in our latest, led by @inespons.bsky.social & in our collaboration w/ @microbiome.bsky.social 🦠🪲 Out today in @natcomms.nature.com! 1/n www.nature.com/articles/s41...

Institute of Evolutionary Biology UW @ibe-warszawa.bsky.social · 8mo ago

Congratulations @djbirddanerd.bsky.social and colleagues on your latest publication! 🥳

Emma Dunne@emmadnn.bsky.social · 8mo ago

🚨 Hot off the press: Our look into of the palaeontological database landscape and its sustainability into the future. Palaeo databases are invaluable and continue to transform our research field - but they are vulnerable... (1/6) 🧪 ⛏️ www.nature.com/articles/s41...

Dr. Bethany Allen @bethanyjallen.bsky.social · 8mo ago

What do we want? Fossil databases! 🐚🦕 When do we want them? Forever! 🗓️ Nice new paper highlighting how academic funding systems and digital architecture need to change, to ensure we can protect and sustain our precious fossil data 📚 www.nature.com/articles/s41...

The billion-dollar case for sustaining palaeontology’s digital databases - Nature Ecology & Evolution

The authors survey community palaeontological databases, documenting their contributions to science as well as their vulnerabilities, and provide recommendations for the future of open science databas...

nature.com

Emma Dunne @emmadnn.bsky.social · 8mo ago

The billion-dollar case for sustaining palaeontology’s digital databases - Nature Ecology & Evolution

nature.com

Kenneth De Baets @djbirddanerd.bsky.social · 9mo ago

This is a really nice paper. I am just confused by statements that ammonoids were affected by and incumbents of the LOME. Ammonoids only originated in the Devonian (even when including their bactritoid ancestors) and not present in Ordovician: doi.org/10.1127/pala... doi.org/10.1007/s133...

Emsian Ammonoidea and the age of the Hunsrück Slate (Rhenish Mountains, Western Germany) - Palaeontographica Abteilung A Band 299 Lieferung 1-6 — Schweizerbart science publishers

doi.org

Thomas R. Holtz, Jr.@arctomet.bsky.social · 9mo ago

Mass extinction triggered the early radiations of jawed vertebrates and their jawless relatives (gnathostomes) | Science Advances www.science.org/doi/10.1126/...

@ciclasoman.bsky.social · 10mo ago

Just a reminder, wild places and wildlife are fragile. Paretroplus dambabe unknown to most people is extinct in it’s native home of Madagascar