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Alexander Pohle

@apohle.ecoevo.social.ap.brid.gy

#Palaeontologist, Postdoc at the University of Zurich, Department of #Palaeontology. #cephalopods #fossils #palaeobiology #phylogenetics #biomineralization #evolution 🌉 bridged from ⁂ ecoevo.social/@apohle, follow @ap.brid.gy to interact

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Alexander Pohle @apohle.ecoevo.social.ap.brid.gy · 29/07/2026

This is Fig. 7 from our paper, showing the complex siphuncle of Sinoeremoceras marywadeae (late Cambrian). How do you get from the newly described species to this one? peerj.com/articles/17003

Siphuncle of Sinoeremoceras marywadeae, consisting of narrowly spaced, expanded segments with a dorsal extension of the septal neck.

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Alexander Pohle @apohle.ecoevo.social.ap.brid.gy · 03/07/2026

New paper out led by Christian Klug! Vertebrates are not usually my field of expertise, though here I was able to contribute Bayesian phylogenetic analyses and part of the reconstruction of the 3D models. doi.org/10.4202/app.01290.2025 #palaeontology […] [Original post on ecoevo.social]

Fig. 7. The head of the phoebodontiform elasmobranch Phoebodus saidselachus Frey et al., 2019a (B ESEFB-LTM-203), middle Famennian, Upper Devonian, southern Maïder, Anti-Atlas, Morocco. Three-dimensional reconstructions of specimen in posterior (A1), right side (A2), dorsal (A3), left side (A4), anterior (A5), and ventral (A6) views. Note that the nasal capsules, the rostrum and parts of the Meckel’s cartilages are eroded. All renderings are in orthographic view.

Fig. 22. Phylogeny based on the emended character matrix from Coates et al. (2017) and Frey et al. (2019a, 2020). Bayesian tip-dating analyses of 230 characters were performed using the fossilized birth–death model. Numbers shown at nodes represent posterior probabilities.

Fig. 21. Reconstructions of an adult female and juvenile male of the phoebodontiform elasmobranch Phoebodus saidselachus Frey et al., 2019a, middle Famennian, Upper Devonian, southern Maïder, Anti-Atlas, Morocco. We incorporated the new anatomical details particularly in the proportions and the fin shapes. The juvenile is reconstructed after the holotype.

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Alexander Pohle @apohle.ecoevo.social.ap.brid.gy · 12/06/2026

It's been a while since I posted something for #FossilFriday ! This time I present Ordosoceras sphaeriforme from the #Ordovician of China, an actinoceratid #cephalopod with one of the strangest siphuncles I know. Compare this to modern #Nautilus !

A sectioned and polished fossil of an orthoconic (straight-shelled) cephalopod, accompanied by a label with Chinese letters and "Ordosoceras sphaeriforme Chang".

A section of Ordosoceras sphaeriforme, showing convex septa and a central siphuncle with spherical outgrowths, almost resembling a vertebral column.

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Alexander Pohle @apohle.ecoevo.social.ap.brid.gy · 27/03/2026

New paper out by Dieter Korn and Martina Aubrechtová on a strange group of #Carboniferous #orthoceratoid #cephalopods! doi.org/10.5852/ejt.2026.1048.3231 #FossilFriday #Palaeontology #taxonomy

Rhenocycloceras scalare (d’Archiac & de Verneuil, 1842) gen. et comb. nov., all from Herborn. A. Reproduction of the illustration by Sandberger & Sandberger (1850–1856: pl. 19 fig. 6), composed of specimens Wiesbaden 97a and 97b. B. Neotype Wiesbaden 97a (Sandberger Coll.). C. Specimen Wiesbaden 97b (Sandberger Coll.). D. Reproduction of the illustration by Sandberger & Sandberger (1850–1856: pl. 19 fig. 6a), specimen Wiesbaden 97c, ornament detail. E. Specimen Wiesbaden 97c (Sandberger Coll.). Scale bar units: 1 mm.

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Alexander Pohle @apohle.ecoevo.social.ap.brid.gy · 20/03/2026

Here one of my favorite fossil #cephalopods for #FossilFriday: Pentameroceras mirum from the #Silurian of #Gotland! Those narrow slits of the shell were likely where arms or eyes would stick out!

A Pentameroceras mirum fossill with view of the aperture, held by a hand and with a scale bar. The cross section is circular, about 1 cm, and has one long horizontal slit, which is connected to four more slits about 1/4 to the left. Left side is dorsal, right side ventral.

A Pentameroceras mirum fossill with view of the right lateral side, held by a hand and with a scale bar. The specimen is about 2 cm long, with the apex on the left missing, and the aperture contracted, so that the fossil is more or less drop shaped (except for the missing tip/apex)

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Alexander Pohle @apohle.ecoevo.social.ap.brid.gy · 17/02/2026

Always great to see a bit of humour in scientific papers! Indeed, pesky animals can really mess up your stratigraphy ... From: Flower 1952, www.jstor.org/stable/1299958 #Palaeontology #Stratigraphy

"there are only two ways in which these forms could have arrived in the Harding sandstone. They could have been transported by animals, probably Homo sapiens, or they may represent specimens which were silicified, weathered from the Manitou dolomite, and redeposited in the Harding sandstone. The first possibility I am inclined to dismiss as too improbable. I can conceive of some mischievous student throwing such specimens up hill, but it is hardly likely that such a fate could befall two of the five known specimens of the genus Utoceras."

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Alexander Pohle @apohle.ecoevo.social.ap.brid.gy · 12/01/2026

My guitars comfortably taking a nap backstage on a beanbag chair before perfomance last weekend. #guitar #stilllife #rock #concert #fender #stratocaster #dean #soltero

An orange Dean Soltero and an orange-white Fender Stratocaster sitting on a black beanbag chair.

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Alexander Pohle @apohle.ecoevo.social.ap.brid.gy · 08/11/2025

New paper out on the formation mechanism of cameral deposits in orthoceratoid cephalopds! This topic has been debated for more than 150 years and we now finally have a satisfying solution 🥳 doi.org/10.1111/pala.70032 #palaeontology #cephalopods […] [Original post on ecoevo.social]

Cross and longitudinal sections of Trematoceras, a straight-shelled cephalopod. Each section also shown under cathodoluminescence, showing yellow, blue and red colours.

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Alexander Pohle @apohle.ecoevo.social.ap.brid.gy · 03/11/2025

Nice view of @ruhr-uni-bochum.de campus this evening, though the picture looks a lot more dramatic than it was in reality. #PhotoMonday #sky #clouds #evening #Bochum #RUB #university #campus

Evening sky over university campus, with dark clouds forming a bright hole.

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