Robert Lemanis
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drrlemanis.bsky.social
Robert Lemanis
@drrlemanis.bsky.social
31 followers 41 following 0 posts
Research Scientist, Paleontologist, and Cephalopod enthusiast
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Reposted by Robert Lemanis
vitoninigo.bsky.social
🔓 Now in Open Access! (published in May)

We describe Echioceras, Paltechioceras and Leptechioceras #ammonite species, discussing the biochronostratigraphy and palaeobiogeography in NW Iberia during the upper Sinemurian #Jurassic #FossilFriday @springernature.com

🔗 doi.org/10.1007/s415...
Plate included in the paper, showing Plesechioceras, Echioceras and Paltechioceras species from the Raricostatum Zone (Sinemurian, Lower Jurassic) of the NW Iberia.
September 12, 2025 at 9:21 AM
Reposted by Robert Lemanis
nhmbryozoa.bsky.social
#MolluscMonday Nautilus big and small, Eocene and modern, photographed during 2007 at the Priabona museum in northern Italy.
June 2, 2025 at 5:52 AM
Reposted by Robert Lemanis
obialik.bsky.social
#WeekendReading: Faulkner et al. (w/
@rowanmartindale.bsky.social;
@chrislowery.bsky.social) on how the test walls of foraminifera change through the Phanerozoic and what might that have to do with ocean chemistry. 🧪⚒️🌊
royalsocietypublishing.org/doi/10.1098/...
Bootstrap analysis for the origination rates and extinction rates of calcareous (dotted lines) and agglutinated (dashed lines) foraminifera. (A) Expected (light orange shading) versus actual (dark orange dotted line) calcareous extinction rates, (B) expected (light blue shading) versus actual (dark blue dotted line) calcareous origination rates, (C) expected (light orange shading) versus actual (dark orange dashed line) agglutinated extinction rates and (D) expected (light blue shading) versus actual (dark blue dashed line) agglutinated origination rates. Vertical dashed lines indicate the Big Five mass extinction events; the Phanerozoic time scale is at the bottom of the figure; transitions between calcite and aragonite seas are indicated at the top of the figure and the black gradient bar (middle) represents the approximate duration of the Mesozoic Marine Revolution (MMR). p̂ = origination rate; q̂ = extinction rate.
April 18, 2025 at 7:22 AM
Reposted by Robert Lemanis
cephwarden.bsky.social
They have made the first ever live observation of a colossal squid (Mesonychoteuthis hamiltoni), albeit a small juvenile. Amazing! @autsquidsquad.bsky.social

www.youtube.com/watch?v=lzPo...
Colossal Squid, 1st Live Observation | Searching for New Species in the South Sandwich Islands
YouTube video by Schmidt Ocean
www.youtube.com
April 16, 2025 at 2:28 AM
Reposted by Robert Lemanis
neohibolites.bsky.social
www.geo.de/natur/tierwe...

🧪 #paleontology #fossils
Das Rätsel der Ammoniten: Wie sie lebten und warum sie ausstarben
Ammoniten gehören zu den häufigsten Fossilien überhaupt, Abermillionen Versteinerungen zeugen von ihrem einstigen Erfolg. Doch die Kopffüßer bergen zahlreiche Geheimnisse. Warum?
www.geo.de
March 13, 2025 at 9:21 AM
Reposted by Robert Lemanis
neohibolites.bsky.social
www.biorxiv.org/content/10.1...

Check out our new #preprint, in which our team lead by Alex Pohle likely solved how the enigmatic ‚cameral deposits‘ of #fossil orthoceratoid #cephalopods were formed. 🧪
Microstructural and geochemical evidence offers a solution to the cephalopod cameral deposits riddle
Orthoceratoid cephalopods are common in the Palaeozoic rock record but became extinct in the Late Triassic. Many orthoceratoids contain cameral deposits, which are enigmatic calcareous structures with...
www.biorxiv.org
March 1, 2025 at 11:11 AM
Reposted by Robert Lemanis
sigwartae.bsky.social
Here is the mollusc tree. (We fixed it, you're welcome.) 😇 @sgn.one @oceanspecies.bsky.social @kmkocot.bsky.social
@squamiferum.bsky.social www.science.org/doi/10.1126/...
February 27, 2025 at 8:11 PM
Reposted by Robert Lemanis
egmitchell.bsky.social
Super excited that our review on the ecology of the Ediacaran-Cambrian transition is now out on how ecology changes across scales from organisms to communities to the world through time. Fab art @franzanth.bsky.social showing the build up of ecological complexity
www.cambridge.org/core/journal...
January 22, 2025 at 6:28 PM
Reposted by Robert Lemanis
neohibolites.bsky.social
If you‘re at #PalAss24 don‘t miss tomorrow’s talk about our preprint on #belemnite phylogeochemistry by Alexander Pohle. egusphere.copernicus.org/preprints/20...
Phylogeochemistry: exploring evolutionary constraints on belemnite rostrum element composition
Abstract. The biogenic carbonate hardparts of a large range of marine organisms are the most important geochemical archives of Earth’s climate dynamics through time and the evolution of life. That sai...
egusphere.copernicus.org
December 10, 2024 at 5:59 PM
Reposted by Robert Lemanis
djbirddanerd.bsky.social
🐚 #Fossilfriday🌀 #Ammonoid research using new index reveals that taxa with complex ornamentation have higher origination/extinction rates 📈 and shorter evolutionary ranges 📉 than simpler forms. #Complexity drives rapid #Evolution and increased #Extinction! #Paleontology dx.doi.org/10.1016/j.cu...
Redirecting
dx.doi.org
November 15, 2024 at 8:39 AM
Reposted by Robert Lemanis
nadwgab.bsky.social
One of my (many) favourite specimens in the NHM London's Mineral Gallery is this "snake stone". The chambers of this Ammonites perarmatus have been replaced by calcite, allowing us to see its internal structure in great detail #FossilFriday 🧪⚒️
The internal chambers of an ammonite, replaced by cream coloured calcite, arranged in a coiled shape. Label text: Snake stone cast of the interior of the shell Ammonites perarmatus (Sowerby), from Abingdon, Berkshire.
August 16, 2024 at 9:13 PM